Answer:
Net ionic equation for the reaction between MgCl₂ and NaOH in water:
[tex]\rm Mg^{2+}\; (aq) + 2\; OH^{-}\; (aq) \to Mg(OH)_2\;(s)[/tex].
Net ionic equation for the reaction between MgSO₄ and BaCl₂ in water:
[tex]\rm {Ba}^{2+}\; (aq) + {SO_4}^{2-}\;(aq) \to BaSO_4\; (s)[/tex].
Explanation:
Start by finding the chemical equations for each reaction:
MgCl₂ reacts with NaOH to form Mg(OH)₂ and NaCl. This reaction is a double decomposition reaction (a.k.a. double replacement reaction, salt metathesis reaction.) This reaction is feasible because one of the products, Mg(OH)₂, is weakly soluble in water and exists as a solid precipitate.
[tex]\rm MgCl_2\; (aq) + 2\; NaOH\; (aq)\to Mg(OH)_2 \; (s) + 2\; NaCl\; (aq)[/tex].
MgSO₄ reacts with BaCl₂ in a double decomposition reaction to produce BaSO₄ and MgCl₂. Similarly, the solid product BaSO₄ makes this reaction is feasible.
[tex]\rm MgSO_4\; (aq) + BaCl_2\; (aq) \to BaSO_4\; (s) + MgCl_2\; (aq)[/tex].
How to rewrite a chemical equation to produce a net ionic equation?
Rewrite all reactants and products that ionizes completely in the solution as ions.Eliminate ions that exist on both sides of the equation to produce a net ionic equation.Typical classes of chemicals that ionize completely in water:
Soluble salts, Strong acids, andStrong bases.Keep the formula of salts that are not soluble in water, weak acids, weak bases, and water unchanged.
Take the first reaction as an example, note the coefficients:
MgCl₂ is a salt and is soluble in water. Each unit of MgCl₂ can be written as [tex]\rm Mg^{2+}[/tex] and [tex]\rm 2\; Cl^{-}[/tex].NaOH is a strong base. Each unit of NaOH can be written as [tex]\rm Na^{+}[/tex] and [tex]\rm OH^{-}[/tex].Mg(OH)₂ is a weak base and should not be written.NaCl is a salt and is soluble in water. Each unit of NaCl can be written as [tex]\rm Na^{+}[/tex] and [tex]\rm Cl^{-}[/tex].[tex]\rm Mg^{2+} + 2\; Cl^{-} + 2\; Na^{+} + 2\; OH^{-} \to Mg(OH)_2\;(s) + 2\; Na^{+} + 2\; Cl^{-}[/tex].
Ions on both sides of the equation:
[tex]\rm 2\; Cl^{-}[/tex], and[tex]\rm 2\; Na^{+}[/tex].Add the state symbols:
[tex]\rm Mg^{2+}\; (aq) + 2\; OH^{-}\; (aq) \to Mg(OH)_2\;(s)[/tex].
For the second reaction:
[tex]\rm MgSO_4\; (aq) + BaCl_2\; (aq) \to BaSO_4\; (s) + MgCl_2\; (aq)[/tex].
[tex]\rm Mg^{2+} + 2\; {SO_4}^{2-} + Ba^{2+} + 2\; Cl^{-} \to BaSO_4\; (s) + Mg^{2+} + 2\; Cl^{-}[/tex].
[tex]\rm Ba^{2+}\; (aq) + {SO_4}^{2-}\; (aq) \to BaSO_4\; (s)[/tex].
The net ionic equation of the reaction
a. Mg²⁺ (aq) + 2OH⁻ (aq) ---> MgOH₂ (s)
b. Ba²⁺(aq) + SO₄²⁻(aq) ----> BaSO₄(s)
Further explanationThe electrolyte in the solution produces ions.
The equation of a chemical reaction can be expressed in the equation of the ions
For strong electrolytes (the ionization rate = 1) is written in the form of separate ions, while the weak electrolyte (degree of ionization <1) is still written as an un-ionized molecule
In the ion equation, there is an ion spectator that is the ion which does not react because it is present before and after the reaction
When these ions are removed, the ionic equation is called the net ionic equation
For gases and solids including water (H₂O) can be written as an ionized molecule
So only the dissolved compound is ionized ((expressed in symbol aq)
Formation of precipitating compounds that cause reactions can occur from double-replacement reactions
Solubility Rules:
• 1. soluble compound
All compounds of Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺, and NH₄⁺
All compounds of NO₃⁻ and C₂H₃O₂⁻
Compounds of Cl⁻, Br⁻, I⁻ except Ag⁺, Hg₂²⁺, Pb²⁺
Compounds of SO₄²⁻ except Hg₂²⁺, Pb²⁺, Sr²⁺, Ba²⁺
• 2. insoluble compounds
Compounds of CO₃²⁻ and PO₄³⁻ except for Compounds of Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺, and NH₄⁺
Compounds of OH− except Compounds of Li⁺, Na⁺, K⁺, Rb⁺, Cs⁺, NH₄⁺, Sr²⁺, and Ba²⁺
the reaction of MgCl₂ with NaOH:
MgCl₂ (aq) + 2NaOH (aq) -> Mg(OH)₂ (s) + 2NaCl (aq)
complete ion reaction:
Mg²⁺ (aq) + 2Cl⁻ (aq) + 2Na⁺ (aq) + 2OH⁻ (aq) -> Mg(OH)₂ + 2Na⁺ (aq) + 2Cl⁻(aq)
net ionic equation: Mg²⁺ (aq) + 2OH⁻ (aq) ---> MgOH₂ (s)
the reaction of MgSO₄ with BaCl₂
MgSO₄ (aq) + BaCl₂ (aq) -> BaSO₄ (s) + MgCl₂ (aq)
Complete ion reaction:
[tex]\rm Mg^{2+}(aq)+SO_4^{2-}(aq)+Ba^{2+}(aq)+2Cl^-(aq)\to BaSO_4(s)+Mg^{2+}(aq)+2Cl^-(aq)\\\\net\:ionic\:equation:Ba^{2+}(aq)+SO_4^{2-}(aq)\to BaSO_4(s)[/tex]
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Keywords: the net ionic equation, spectator ions, molecular equation,full ionic equation
Calculate the enthalpy change for the thermite reaction: 2Al(s)+Fe2O3(s)→2Fe(s)+Al2O3(s), ΔH∘rxn=−850 kJ when 12.0 mol of Al undergoes the reaction with a stoichiometrically equivalent amount of Fe2O3. Express your answer to three significant figures and include the appropriate units.
The enthalpy change for the thermite reaction is -9502.4 kJ.
Explanation:The enthalpy change for the thermite reaction can be calculated using Hess's law. The reaction occurs in three distinct steps: the formation of 1 mol of solid aluminum oxide (Al2O3) and 2 mol of liquid iron at its melting point of 1758°C, the conversion of 2 mol of liquid iron at 1758°C to 2 mol of solid iron at 1758°C, and the conversion of 2 mol of solid iron at 1758°C to 2 mol of solid iron at 25°C. The enthalpy changes for these steps are -732.5 kJ/mol of Fe₂O3, -13.8 kJ/mol of Fe, and -45.5 kJ/mol of Fe, respectively.
By Hess's law, the overall enthalpy change for the reaction is the sum of these individual enthalpy changes. Therefore, the enthalpy change for the thermite reaction is (-732.5 kJ/mol of Fe₂O3) + (-13.8 kJ/mol of Fe) + (-45.5 kJ/mol of Fe) = -791.8 kJ/mol of Fe₂O3.
Since 12.0 mol of Al is undergoing the reaction, the enthalpy change is multiplied by the stoichiometric coefficient of Fe₂O3, which is 1 mol. Therefore, the enthalpy change for the thermite reaction is -791.8 kJ/mol of Fe₂O3 × 12.0 mol = -9502.4 kJ.
If you add 5.00 mL of 0.100 M sodium hydroxide to 50.0 mL of acetate buffer that is 0.100 M in both acetic acid and sodium acetate, what is the pH of the resulting solution? Acetic Acid: Ka = 1.8. x 10-5
Answer:
see explanation ...
Explanation:
5.00ml(0.100M NaOH) + 0.100M HOAc/NaOAc Bfr
5.00ml(0.100M NaOH) = 0.005(0.100) mole NaOH = 0.0005 mole NaOH = 0.0005 mole OH⁻ in 55 ml Bfr solution (50ml + 5ml)=> [OH⁻] = (0.0005/0.055)M OH⁻ = 0.0091M OH⁻ ≈ 0.010M OH⁻ added into Bfr solution. The amount of OH⁻ added must be removed by H⁺ in the HOAc equilibrium; that is, H⁺ + OH⁻ → H₂O leaving a void at the H⁺ position in the HOAc equilibrium. HOAc then decomposes to replace the H⁺ removed by the excess OH⁻ giving new H⁺ and OAc⁻ concentrations. Reaction shifts right => subtract 0.01M from HOAc side of equilibrium and add 0.01M to OAc⁻side of equilibrium and recompute the H⁺ concentration and new pH.
HOAc ⇄ H⁺ + OAc⁻
C(i) 0.10M ~0M* 0.10M =>pH=-log(Ka)=-log(1.85x10⁻⁵)=4.73
ΔC -0.01M +x +0.01M
C(eq) 0.09M x 0.11M => New HOAc equil. conc.
Ka = [H⁺][OAc⁻]/[HOAc]
=> x(0.11)/(0.09) = 1.85x10⁻⁵
=> x = [H⁺] = 0.09(1.85x10⁻⁵)/0.11 = 1.52x10⁻⁵M (after adding NaOH)
=> pH = -log[H⁺] -log(1.52x10⁻⁵) = 4.82 ( pH shifts to more basic value b/c of OH⁻ addition )
If you add 5.00 mL of 0.100 M sodium hydroxide to 50.0 mL of acetate buffer. The pH of the resulting solution is 4.82.
What is pH?pH is a measurement scale, used to measure the acids and the bases
The pH of the resulting solution
[tex]\rm Ka = \dfrac{ [H^+][OAc^-]}{[HOAc]}[/tex]
[tex]x \dfrac{ (0.11)}{(0.09)} = 1.85 \times 10^-^5[/tex]
[tex]\rm x = [H^+] = 0.09 \dfrac{(1.85x10^-^5)}{0.11} = 1.52 \times 10^-^5 M[/tex]
pH = -log[H⁺] -log(1.52x10⁻⁵) = 4.82
( pH shifts to more basic value b/c of OH⁻ addition )
Thus, the pH of the resulting solution is 4.82.
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Mathematically define heat capacity
What are the particles produced in a cathode tube? a. hydrogen b. atoms c. x-rays d. protons e. electrons
The particles produced in a cathode tube are primarily electrons, which strike the glass walls of the tube to produce X-rays.
Explanation:In a cathode tube, when a high voltage is applied, the particles that are produced are primarily electrons. These tubes were historic tools for scientists that led to the discovery of properties of electrons, and they played a significant role in the advancement of physics. Cathode rays were given their name because they emanate from the negatively charged electrode, or cathode, in the tube. When these electrons strike the glass walls of the tube, they can produce X-rays, but it's crucial to note that the X-rays are not the particles generated in the tube itself.
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In a cathode tube, the primary particles produced are electrons. These are emitted from the negatively charged cathode and comes from the ionization of the gas present in the tube, which can be various types of atoms, but not specifically hydrogen.
Explanation:In a cathode tube, or cathode ray tube, the primary particles produced are electrons. These particles are emitted from the negatively charged cathode, hence the name 'cathode rays'. This is a fundamental concept in physics, especially in the study of electricity and magnetism. The creation of these electrons comes from the ionization of the gas present in the tube, which can be various types of atoms, but not specifically hydrogen.
While the other particles listed (protons, atoms, and x-rays) can potentially be involved or produced in different types of tubes or under different conditions, the primary answer in the context of a standard cathode tube is electrons.
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4. Propanol and isopropanol are isomers. This means that they have A) the same molecular formula but different chemical properties. B) different molecular formulas but the same chemical properties. C) the same molecular formula and the same chemical properties. D) the same molecular formula but represent different states of the compound
Answer:
A) the same molecular formula but different chemical properties.
Explanation:
Isomerism is the existence of a compound with the same molecular formula but different molecular structures due to the difference in the arrangement of atoms or spatial orientation of the atoms. In such a compound, they differ in physical and/or chemical properties. Such possible structures are known as isomers.
Propanol and isopropanol differs only in the arrangement of atoms but they both have the same molecular formula. Their physical and chemical properties differ.
Propanol and isopropanol are structural isomers, which means they have the same molecular formula but different chemical properties due to different arrangement of atoms within the molecules.
Explanation:Propanol and isopropanol are indeed isomers, specifically they are structural isomers. Structural isomers are compounds that share the same molecular formula but have a different spatial arrangement of their atoms, leading to different chemical properties. This means, option A) the same molecular formula but different chemical properties, is correct.
A classic example of this are the compounds n-butane and 2-methylpropane. Both compounds have the same molecular formula, C4H10, but n-butane contains an unbranched chain of carbon atoms, while 2-methylpropane has a branched chain. This difference in structure results in different chemical properties for each compound.
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Explain why water is polar. Check all that apply. View Available Hint(s) Water is known as a polar molecule because Check all that apply. the hydrogen atom attracts electrons much more strongly than the oxygen atom. the oxygen atom has a greater attraction for electrons than the hydrogen atom does. the oxygen and hydrogen atoms have the same electronegativity. the electrons of the covalent bond are not shared equally between the hydrogen and oxygen atoms. water dipole moment is equal to zero.
Answer:
The oxygen atom has a greater attraction for electrons than the hydrogen atom does.
The electrons of the covalent bond are not shared equally between the hydrogen and oxygen atoms.
Its molecular geometry is bent.
Water is polar because the oxygen atom has a greater electronegativity than the hydrogen atoms, leading to unequal sharing of electrons and partial charges on the atoms.
Water is known as a polar molecule for various reasons. First, the oxygen atom in water has a greater attraction for electrons than the hydrogen atoms, which is due to its higher electronegativity. This results in the electrons of the covalent bond between hydrogen and oxygen not being shared equally, leading to a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atoms. The polarity of water is a critical factor in its ability to form hydrogen bonds, which are stronger than conventional dipole-dipole forces and contribute to water's unique properties such as high surface tension and the ability to dissolve many substances.
Who determines the crude oil specifications at production facilities?
Answer:
I believe it is the overseer of the operation
At a certain temperature the rate of this reaction is first order in HI with a rate constant of :0.0632s2HIg=H2g+I2g Suppose a vessel contains HI at a concentration of 1.28M . Calculate how long it takes for the concentration of HI to decrease to 17.0% of its initial value. You may assume no other reaction is important. Round your answer to 2 significant digits.
Answer:
[tex]\boxed{\text{28.0 s}}[/tex]
Explanation:
Whenever a question asks you, "How long does it take to reach a certain concentration?" or something like that, you must use the appropriate integrated rate law expression.
The integrated rate law for a first-order reaction is
[tex]\ln \left (\dfrac{[A]_{0}}{[A]} \right ) = kt[/tex]
Data:
[A]₀ = 1.28 mol·L⁻¹
[A] = 0.17 [A]₀
k = 0.0632 s⁻¹
Calculation:
[tex]\begin{array}{rcl}\ln \left (\dfrac{[A]_{0}}{0.170[A]_{0}} \right ) & = & 0.0632t\\\\\ln \left (5.882) & = & 0.0632t\\1.772 & = & 0.0632t\\\\t & = & \dfrac{1.772}{0.0632}\\\\t & = & \textbf{{28.0 s}}\\\end{array}\\\text{It will take } \boxed{\textbf{28.0 s}} \text{ for [HI] to decrease to 17.0 \% of its original value.}[/tex]
Which of the following species has
(a) equal numbers of neutrons and electrons;
(b) protons, neutrons, and electrons in the ratio 9:11:8;
(c) a number of neutrons equal to the number of protons plus one-half the number of electrons?
24Mg2+, 47Cr, 60Co3+, 35Cl-, 124Sn2+, 2266Th, 90Sr Petrucci, Ralph H.. General Chemistry (p. 63). Pearson Education. Kindle Edition.
Answer:
see explanation...
Explanation:
Mg⁺²-24 Co⁺³-60 Clˉ-35
Protons (p⁺) 12 27 17
Neutrons (n⁰) 12 33 18
Electrons (eˉ) 10 24 18
(c) (b) (a)
12/2 : 12/2 : 10/2 27/3 : 33/3 : 24/3 #n⁰ = 18
6 : 6 : 5 9 : 11 : 8 #eˉ = 18
The specs that match the conditions are 24Mg2+ for equal neutrons and electrons, 47Cr for the 9:11:8 proton:neutron:electron ratio, and 35Cl- for having neutrons equal to protons plus one-half the electrons.
Explanation:The question is asking for the species that match specific sets of conditions related to the number of its protons, electrons, and neutrons. In atomic structure, the number of protons defines the atomic number of an element, while the number of electrons defines its charge. The number of neutrons can be found by subtracting the atomic number from the atomic mass.
(a) For a species with equal numbers of neutrons and electrons, we can choose 24Mg2+. Its atomic number is 12, so it has 12 protons. Since it’s a +2 ion, it has lost 2 electrons thus leaving it with 10 electrons. Also, it has 24-12=12 neutrons.
(b) For a species that has protons, neutrons, and electrons in the ratio 9:11:8, we can choose 47Cr. Chromium (Cr) has an atomic number of 24 so it has 24 protons, and 47-24=23 neutrons, and as neutral atom it has 24 electrons. Although not exact, it’s the closest among the choices given.
(c) Finally, a species with a number of neutrons equal to the number of protons plus one-half the number of electrons would be 35Cl-. Chlorine ordinarily has 17 protons and 17 electrons, but as a -1 ion, it has gained 1 extra electron, giving a total of 18 electrons. Half of this is 9. The 17 protons plus the 9 gives 26, which is the number of neutrons in chlorine-35 (35-17=18).
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A student performs a reaction that makes aluminum oxide. According to her calculations, she should expect to make 115.2 grams. She actually produces 66.9 grams. What is her percent yield?
Answer:
The percentage of the student is 58.17%.
Explanation:
Expected yield of aluminum oxide = 115.2 g
Actual yield of aluminum oxide produced =66.9 g
The percentage yield is calculated by dividing actual yield by expected yield and then multiplying it with hundred.
Percentage yield:
[tex]\frac{\text{Actual yield}}{\text{Expected yield}}\times 100[/tex]
[tex]\% Yield=\frac{66.9 g}{115.2 g}\times 100=58.17\%[/tex]
The percentage of the student is 58.17%.
A self-contained underwater breathing apparatus (SCUBA) uses canisters containing potassium superoxide. The superoxide consumes the CO2 exhaled by a person and replaces it with oxygen. 4 KO2(s) + 2 CO2(g) n 2 K2CO3(s) + 3 O2(g) What mass of KO2, in grams, is required to react with 8.90 L of CO2 at 22.0 °C and 767 mm Hg
Answer:
52.0004 grams of mass of potassium superoxide is required
Explanation:
Let moles carbon dioxide gas be n at 22.0 °C and 767 mm Hg occupying 8.90 L of volume.
Pressure of the gas,P = 767 mm Hg = 0.9971 atm
Temperature of the gas,T = 22.0 °C = 295.15 K
Using an ideal gas equation to calculate the number of moles.
[tex]PV=nRT[/tex]
[tex]n=\frac{0.9971 atm\times 8.90 L}{0.0821 atm L/mol K\times 295.15 K}[/tex]
n = 0.3662 mol
[tex]4KO_2(s)+2CO_2(g)\rightarrow 2K_2CO_3(s)+3O_2(g)[/tex]
According to reaction, 2 moles of carbon-dioxide reacts with 4 moles of potassium superoxide.
Then 0.3662 mol of of carbon-dioxide will react with:
[tex]\frac{4}{2}\times 0.3662 mol=0.7324 mol[/tex] of potassium superoxide.
Mass of 0.7324 mol potassium superoxide:
0.7324 mol × 71 g/mol = 52.0004 g
52.0004 grams of mass of potassium superoxide is required.
To find the mass of KO2 required to react with 8.90 L of CO2, we can use the stoichiometry of the balanced equation.
Explanation:To determine the mass of KO2 required to react with 8.90 L of CO2, we need to use the stoichiometry of the balanced equation. From the equation, we can see that 4 moles of KO2 reacts with 2 moles of CO2. We can convert the volume of CO2 to moles using the ideal gas law and then use the mole ratio to find the mass of KO2:
1. Convert 8.90 L of CO2 to moles (using the ideal gas law)
2. Use the mole ratio to find moles of KO2
3. Convert moles of KO2 to grams using the molar mass of KO2
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Which is a difference between molecular compounds and ionic compounds? Select the correct answer below: Question 5 options: Molecular compounds typically form between a metal and a nonmetal, while ionic compounds typically form between nonmetals. Molecular compounds result from the transfer of electrons between atoms to form ions, while ionic compounds result from the sharing of electrons between neutral atoms. Molecular compounds are formed of discrete, neutral molecules, while ionic compounds are formed of large repeating arrays of opposite charges. Molecular compounds have high melting points and high boiling points, while ionic
Answer:
Molecular compounds are formed of discrete, neutral molecules, while ionic compounds are formed of large repeating arrays of opposite charges.
Explanation:
in molecular a group of electron is shared while in ionic compounds electrons are transferred.
Molecular compounds are formed from the sharing of electrons between nonmetals to form discrete, neutral molecules. In contrast, ionic compounds result from the transfer of electrons between a metal and a nonmetal, forming a large repeating array of opposite charges.
Explanation:The main difference between molecular compounds and ionic compounds lies in the nature of the bonding between the atoms. Molecular compounds are formed of discrete, neutral molecules. These molecules are formed when atoms of two or more nonmetals share electrons to form covalent bonds. Examples include water (H2O) and carbon dioxide (CO2).
On the other hand, ionic compounds are formed of large repeating arrays of opposite charges. Ionic bonding typically occurs between a metal and a nonmetal atom, wherein electrons are transferred from the metal atom to the nonmetal atom. This transfer of electrons forms positively and negatively charged ions that attract one another to form the compound. Common examples of ionic compounds include sodium chloride (NaCl) and calcium chloride (CaCl2).
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11. Phosphorus-32 is radioactive and has a half life of 14 days. How much of a 124 mg sample of phosphorus-32 is present after 56 days? A) 7.75 mg B) 15.5 mg C) 31.0 mg D) 62.0 mg
Answer: The correct answer is Option A.
Explanation:
All the radioactive decay processes follows first order kinetics.
To calculate the rate constant for a reaction, we use the equation:
[tex]k=\frac{0.693}{t_{1/2}}[/tex]
where,
k = rate constant for a reaction
[tex]t_{1/2}[/tex] = half life of a reaction = 14 days
Putting all the values in above equation, we get:
[tex]k=\frac{0.693}{14days}=0.0495days^{-1}[/tex]
To calculate the amount of sample left, we use the equation:
[tex]N=N_o\times e^{-kt}[/tex]
where,
N = amount of sample left after time 't'
[tex]N_o[/tex] = initial amount of the sample = 124 mg
k = rate constant of the reaction = [tex]0.0495days^{-1}[/tex]
t = time taken = 56 days
Putting values in above equation, we get:
[tex]N=124mg\times e^{(-0.0495days^{-1}\times 56days)}=7.75mg[/tex]
Hence, the correct answer is Option A.
In a common experiment in the general chemistry laboratory, magnesium metal is heated in air to produce MgO. MgO is a white solid, but in these experiments it often looks gray, due to small amounts of Mg3N2 , a compound formed as some of the magnesium reacts with nitrogen. Write a balanced equation for each reaction.
Explanation:
When magnesium metal burns is heated i the air it forms magnesium oxide.The balanced chemical reaction is given as:
[tex]2Mg+O_2\rightarrow 2MgO[/tex]
2 moles of magnesium metal when reacts with 1 moles of oxygen it gives 2 moles of magnesium oxide which is white in color.
Some times along with formation of magnesium oxide small amount of magnesium nitride also produced due to which magnesium oxide appears grey in color .The balanced chemical reaction is given as:
[tex]3Mg+N_2\rightarrow Mg_3N_2[/tex]
3 moles of magnesium combines with 1 mol of nitrogen gas to to give 1 mol of magnesium nitride.
Final answer:
Magnesium reacts with oxygen to form magnesium oxide (2 Mg(s) + O₂(g) → 2 MgO(s)) and can also react with nitrogen to form magnesium nitride (3 Mg(s) + N₂(g) → Mg₃N₂(s)), causing the white magnesium oxide to appear gray.
Explanation:
Chemical Reactions of Magnesium
When magnesium metal is heated in air, it primarily reacts with oxygen to produce magnesium oxide (MgO), which is a white solid. The balanced chemical equation for this reaction is:
2 Mg(s) + O₂(g) → 2 MgO(s)
However, when there is nitrogen present in the air, magnesium can also react with nitrogen to form magnesium nitride (Mg₃N₂), which generally gives a gray appearance to the product. The balanced equation for the formation of magnesium nitride is:
3 Mg(s) + N₂(g) → Mg₃N₂(s)
Both reactions involve a combination with another element to form a compound, showcasing the highly reactive nature of magnesium at high temperatures.
Which of the following is a FALSE statement about carbohydrates? Glycogen is a complex carbohydrate formed by dehydration synthesis of glucose molecules. Carbohydrates consist of monomers called simple sugars. Dietary glucose is primarily used to drive our metabolic pathways that produce energy. The chemical composition of carbohydrates includes two oxygens and one hydrogen for every carbon present.
Answer:
The chemical composition of carbohydrates includes two oxygens and one hydrogen for every carbon present.
Explanation:
Generally, each carbon atom in the carbohydrates has one oxygen molecule and 1 – 3 hydrogen (depending on the position of the carbon in the chain and also the types of bonds around it). Usually, the ratio of hydrogen to oxygen in carbohydrates is approximately 2:1 Example of carbohydrates are starch and glycogen.
The incorrect statement is 'The chemical composition of carbohydrates includes two oxygens and one hydrogen for every carbon present.' Carbohydrates have carbon, hydrogen, and oxygen atoms in a 1:2:1 ratio. The other statements about glycogen, monomers of carbohydrates, and the use of dietary glucose for energy are accurate.
Explanation:
The false statement about carbohydrates is 'The chemical composition of carbohydrates includes two oxygens and one hydrogen for every carbon present.' The correct composition of carbohydrates is carbon, hydrogen, and oxygen in a ratio of 1:2:1. Hence, for every carbon atom, there would be two hydrogen atoms and one oxygen atom.
Relating to the other facts, Glycogen is indeed a complex carbohydrate formed by dehydration synthesis of glucose molecules. It's a way our bodies store glucose for energy purposes. Carbohydrates do indeed consist of monomers called simple sugars or monosaccharides. These include glucose, fructose, and galactose, among others. Dietary glucose is primarily used to drive our metabolic pathways that produce energy. When we digest foods rich in carbohydrates, they are broken down into glucose, which is used to provide energy for cells.
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1.50 × 104 J of energy is transferred thermally into a huge tank filled with liquid water. The water temperature remains constant at 10.0 ∘C during the process.Part ABy how much does the entropy of the water change?
Final answer:
The change in entropy of the water is 53.0 J/K.
Explanation:
The change in entropy of the water can be calculated using the equation:
ΔS = Q / T
Where ΔS is the change in entropy, Q is the heat transfer, and T is the temperature in Kelvin.
In this case, the heat transfer is 1.50 × 10^4 J and the temperature is 10.0 °C, which is equal to 283.15 K.
So, ΔS = 1.50 × 10^4 J / 283.15 K = 53.0 J/K.
In acidic solution, the nitrate ion can be used to react with a number of metal ions. One such reaction is NO3−(aq)+Sn2+(aq)→NO2(aq)+Sn4+(aq) Since this reaction takes place in acidic solution, H2O(l) and H+(aq) will be involved in the reaction. Places for these species are indicated by the blanks in the following restatement of the equation: NO3−(aq)+Sn2+(aq)+ −−−→NO2(aq)+Sn4+(aq)+ −−− Part A What are the coefficients of the reactants and products in the balanced equation above? Remember to include H2O(l) and H+(aq) in the appropriate blanks. Your answer should have six terms. Enter the equation coefficients in order separated by commas (e.g., 2,2,1,4,4,3). Include coefficients of 1, as required, for grading purposes.
Answer:
[tex]\boxed{\text{2, 1, 4, 2, 1, 2}}[/tex]
Explanation:
NO₃⁻ + Sn²⁺ + __ → NO₂ + Sn⁴⁺ + __
Step 1: Separate into two half-reactions.
NO₃⁻ ⟶ NO₂
Sn²⁺ ⟶ Sn⁴⁺
Step 2: Balance all atoms other than H and O.
Done
Step 3: Balance O.
NO₃⁻ ⟶ NO₂ + H₂O
Sn²⁺ ⟶ Sn⁴⁺
Step 4: Balance H
NO₃⁻ + 2H⁺ ⟶ NO₂ + H₂O
Sn²⁺ ⟶ Sn⁴⁺
Step 5: Balance charge.
NO₃⁻ + 2H⁺ + e⁻ ⟶ NO₂ + H₂O
Sn²⁺ ⟶ Sn⁴⁺ + 2e⁻
Step 6: Equalize electrons transferred.
2 × [NO₃⁻ + 2H⁺ + e⁻ ⟶ NO₂ + H₂O]
1 × [Sn²⁺ ⟶ Sn⁴⁺ + 2e⁻]
Step 7: Add the two half-reactions.
2 × [NO₃⁻ + 2H⁺ + e⁻ ⟶ NO₂ + H₂O]
1 × [Sn²⁺ ⟶ Sn⁴⁺ + 2e⁻]
2NO₃⁻ + Sn²⁺ + 4H⁺ ⟶ 2NO₂ + Sn⁴⁺ + 2H₂O
Step 8: Check mass balance.
On the left: 2 N, 6 O, 1 Sn, 4H
On the right: 2 N, 6 O, 1 Sn, 4H
Step 9: Check charge balance.
On the left: -2 + 6 = +4
On the right: +4
The equation is balanced.
[tex]\text{The coefficients are }\boxed{\textbf{2, 1, 4, 2, 1, 2}}[/tex]
The balanced equation for the redox reaction in an acidic solution between nitrate ions and tin ions is: 4H+(aq) + NO3−(aq) + 3Sn2+(aq) → NO2(aq) + 2H2O(l) +3Sn4+(aq). Here, nitrate ions get reduced to nitrite, while tin ions get oxidized.
Explanation:The reaction you have provided is a redox reaction taking place in an acidic medium. The goal is to balance this equation, including the terms representing water (H2O) and hydrogen ion (H+). Using the half-reaction method, the balanced equation becomes: 4H+(aq) + NO3−(aq) + 3Sn2+(aq) → NO2(aq)+ 2H2O(l) +3Sn4+(aq).
In this reaction, the nitrate ion is reduced to nitrite (NO2−), while the tin ions (Sn2+) are oxidized to Sn4+. The acidic medium provides the necessary hydrogen ions (H+) and water is also a product of the reaction.
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Nitrogen gas is introduced into a large deflated plastic bag. No gas is allowed to escape, but as more and more nitrogen is added, the bag inflates to accommodate it. The pressure of the gas within the bag remains at 1.00 atm and its temperature remains at room temperature (20.0∘C). How many moles n have been introduced into the bag by the time its volume reaches 22.4 L
Answer:
0.9307 moles have been introduced into the bag.
Explanation:
Pressure of the gas within the bag,P = 1.00 atm
Temperature of the gas remains at room temperature,T=20.0 °C = 293.15 K
Volume of the gas in the bag = V = 22.4 L
Number of moles of gas = n
Using an ideal gas equation:
[tex]PV=nRT[/tex]
[tex]1.00 atm\times 22.4 atm=n\times 0.0821 atm l/mol K\times 293.15 K[/tex]
n = 0.9307 moles
0.9307 moles have been introduced into the bag.
To find the number of moles of nitrogen gas introduced into the bag, use the ideal gas law equation PV = nRT. Substitute the given values into the equation, rearrange to solve for n, and calculate the value of n.
Explanation:To find the number of moles of nitrogen gas introduced into the bag, we can use the ideal gas law equation:
PV = nRT
Given: P = 1.00 atm (pressure), V = 22.4 L (volume), T = 20.0°C = 293 K (temperature), R = 0.0821 L·atm/(mol·K) (gas constant for ideal gases)Substitute the given values into the equation:(1.00 atm)(22.4 L) = n(0.0821 L·atm/(mol·K))(293 K)
Rearrange the equation to solve for n:n = (1.00 atm)(22.4 L) / (0.0821 L·atm/(mol·K))(293 K)
Calculate the value of n:n ≈ 0.967 mol
Therefore, approximately 0.967 moles of nitrogen gas have been introduced into the bag when its volume reaches 22.4 L.
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A sample of SO3 is introduced into an evacuated sealed container and heated to 600 K. The following equilibrium is established: 2 SO3( g) ∆ 2 SO2( g) + O2( g) The total pressure in the system is 3.0 atm and the mole fraction of O2 is 0.12. Find Kp
Answer: The value of [tex]K_p[/tex] is 0.050.
Explanation:
According to Raoult's law, the vapor pressure of a component at a given temperature is equal to the mole fraction of that component multiplied by the vapor pressure of that component in the pure state.
[tex]p_x=x\times P[/tex]
As we know the mole fraction of [tex]O_2[/tex] is 0.12
The partial pressure of [tex]O_2=0.12\times 3.0atm=0.36atm[/tex]
The partial pressure of [tex]SO_2=2\times 0.36atm=0.72atm[/tex]Thus the partial pressure of [tex]SO_3[/tex] is = [3 - (0.36+0.720)] atm = 1.92 atm
[tex]p_{SO3}[/tex]= 1.92 atm
[tex]2SO_3(g)\rightleftharpoons 2SO_2(g)+O_2(g)[/tex]
[tex]K_p=\frac{p_{O_2}\times (p_{SO_}2)^2}{(p_{SO_3})^2}[/tex]
[tex]K_p=\frac{0.36\times (0.72)^2}{(1.92)^2}[/tex]
[tex]K_p=0.050[/tex]
The value of [tex]K_p[/tex] is 0.050.
The value of Kp is 0.050.
Raoult's law:As per this law, the vapor pressure of a component at a given temperature should be equivalent to the mole fraction of that component and then it should be multiplied by the vapor pressure of that component in the pure state.
[tex]p_x = x\times P[/tex]
Since mole fraction of oxygen is 0.12
Now the partial pressure should be = 0.12(3) = 0.36
The partial pressure of SO_2 is = 2(0.36) = 0.72
Now the partial pressure of SO_3 is [3 - (0.36+0.720)] atm = 1.92 atm
Now Kp is
[tex]= 0.36 \times (0.72)^3 \div (1.92)^3[/tex]
= 0.050
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calculate how many moles of NO2 form when each of the following completely reacts. 2N2O5(g)→4NO2(g)+O2(g) Part A 1.0 mol N2O5 Express your answer using two significant figures. nothing mol m o l Request Answer Part B 5.4 mol N2O5 Express your answer using two significant figures.
In the given equation, 2 moles of N2O5 will react to form 4 moles of NO2. Therefore, 1 mole of N2O5 will form 2 moles of NO2, and 5.4 moles of N2O5 will form 11 moles of NO2.
Explanation:When determining the amount of a product made from a reactant in a chemical equation, we use stoichiometry, guided by the coefficients in the balanced chemical equation. In this equation, 2N2O5(g)→4NO2(g)+O2(g), the coefficient in front of N2O5 is 2 and in front of NO2 is 4. This tells us that for every 2 moles of N2O5, 4 moles of NO2 will be produced.
Part A: If 1 mole of N2O5 fully reacts, it will form 2 moles of NO2. (Ratio is 2:4, therefore halved to 1:2)
Part B: If 5.4 moles of N2O5 fully reacts, it will form 10.8 (which rounds to 11 with two significant figures) moles of NO2. (Ratio 5.4 * 2 moles of NO2/mole of N2O5)
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Liquid octane (C8H18), a component of gasoline, reacts with gaseous oxygen to form gaseous carbon dioxide and water vapor. Write the balanced chemical reaction for this process. Express your answer as a chemical equation including phases.
Answer : The balanced chemical reaction will be,
[tex]2C_8H_{18}(l)+25O_2(g)\rightarrow 16CO_2(g)+18H_2O(g)[/tex]
Explanation :
The process is a combustion reaction.
Combustion reaction : It is a type of reaction in which a hydrocarbon react with the oxygen gas to give carbon dioxide gas and water vapor as a product.
As per question, when liquid octane react with oxygen gas to give carbon dioxide gas and water vapor as a product.
Thus, the balanced chemical reaction will be :
[tex]2C_8H_{18}(l)+25O_2(g)\rightarrow 16CO_2(g)+18H_2O(g)[/tex]
Final answer:
The balanced chemical equation for the combustion of octane with oxygen is 2 C₈H₁₈(l) + 25 O₂(g) → 16 CO₂(g) + 18 H₂O(g), demonstrating a complete combustion process that results in the production of carbon dioxide and water vapor.
Explanation:
The balanced chemical equation for the combustion of liquid octane (C8H18) with gaseous oxygen (O2) to form carbon dioxide (CO2) and water vapor (H2O) is represented as follows:
2 C₈H₁₈(l) + 25 O₂(g) → 16 CO₂(g) + 18 H₂O(g)
This equation shows that the combustion of 2 moles of octane consumes 25 moles of oxygen to produce 16 moles of carbon dioxide and 18 moles of water vapor, indicating a complete combustion process where octane is fully oxidized. The equation encompasses the phases of each compound, indicating that octane and water are in the liquid and gaseous states, respectively, while oxygen and carbon dioxide are gases.
Intravenous, or IV, solutions used in medicine must exert the same osmotic pressure as blood to prevent a net flow of water into or out of the blood cells. The proper concentration for an intravenous NaCl solution is 0.90 g NaCl per 100. mL of solution (sometimes referred to as 0.90% m/v). If the van't Hoff factor of NaCl is ????=1.8, what is the osmotic pressure of blood at body temperature, 37 ∘C?
Final answer:
The osmotic pressure of blood at body temperature of 37°C is 7.6 atm. This is calculated using the formula for osmotic pressure Π = iMRT, where i is the van't Hoff factor for NaCl (1.8), M is the molarity of the saline solution (0.154 M), R is the gas constant, and T is the temperature in Kelvin.
Explanation:
The student has asked about the osmotic pressure of blood at body temperature, which relates to the field of chemistry. To answer this question, one must use the concept of osmolarity, which involves the concentration of particles that contribute to osmotic pressure in a solution. The osmotic pressure of an ideal solution can be calculated with the equation Π = iMRT, where Π is the osmotic pressure in atm, i is the van't Hoff factor, M is the molarity of the solution, R is the ideal gas constant (0.0821 L·atm/K·mol), and T is the temperature in Kelvin.
Given that a normal saline solution is 0.90% m/v or 0.90 g NaCl per 100 mL of solution, we can calculate the molarity. Since the density of the solution is assumed to be 1.0 g/mL, and the molar mass of NaCl is approximately 58.44 g/mol, the molarity (M) of a saline solution that mimics the osmotic pressure of blood is 0.154 M. Considering NaCl dissociates into two particles (Na+ and Cl-), the total concentration of dissolved particles would be 2 times 0.154 M, or 0.308 M, given the van't Hoff factor (i) for NaCl is 1.8.
Using the van't Hoff factor for NaCl (i = 1.8) and the calculated total concentration, the osmotic pressure of blood at body temperature (37°C or 310 K) is 7.6 atm. This aligns with the physiological need for intravenous solutions to match the osmotic pressure of blood in order to prevent damage to blood cells due to osmotic imbalances.
The osmotic pressure of the solution is approximately 7.04 atm, which closely matches the osmotic pressure of human blood.
Intravenous (IV) solutions are critical in medicine because they must exert the same osmotic pressure as blood to ensure there is no net flow of water into or out of blood cells. Given that the proper concentration for an IV NaCl solution is 0.90 g NaCl per 100 mL of solution and that the van't Hoff factor for NaCl is 1.8, we can determine the osmotic pressure of blood at body temperature (37°C).
The osmotic pressure (π) is calculated using the formula π = iMRT, where:
i is the van't Hoff factorM is the molarityR is the gas constant (0.0821 L·atm/(K·mol))T is the temperature in KelvinFirst, we need to convert the concentration to molarity:
Molarity, M = (0.90 g NaCl / 100 mL) * (1 mol / 58.44 g) * (1000 mL / 1 L) ≈ 0.154 M
Next, we apply the formula with the values provided:
π = 1.8 * 0.154 M * 0.0821 (L·atm)/(K·mol) * (310.15 K) ≈ 7.04 atm
Therefore, the osmotic pressure of the solution is approximately 7.04 atm, which closely matches the osmotic pressure of human blood.
Which of the following is true for all exergonic reactions? The reaction releases energy. A net input of energy from the surroundings is required for the reactions to proceed. The reactions are rapid. The products have more total energy than the reactants. The reaction goes only in a forward direction: all reactants will be converted to products, but no products will be converted to reactants.
Answer:
The reaction releases energy
Explanation:
The products of an exergonic reaction have a lower energy state (Delta-G) compared to the reactants. Therefore there is a negative delta –G between products and reactants after the reactions. This means some energy is lost into the environment usually through light or heat.
Exergonic reactions are characterized by a net release of energy but they still require a small initial energy input to start, referred to as the 'activation energy'. The speed or direction of the reaction is not determined by whether it's exergonic.
Explanation:In the context of chemical reactions, the true statement for all exergonic reactions is that such reactions result in a net release of energy. However, even exergonic reactions, which are characterized by energy release, require a small initial input of energy to get started. This initial energy demand is referred to as the 'activation energy'. Also, it's important to note that the speed of the reaction or its directionality (whether it proceeds only in a forward direction) are not inherently determined by whether a reaction is exergonic. These aspects depend on other reaction conditions and catalysis.
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Consider the oxidation of sodium metal to sodium oxide described by the balanced equation: 4 Na(s) + O2(g) → 2 Na2O(s) As you can see there are letters in parentheses after each substance. Show you know the meaning of these letters by filling in what they stand for:
Final answer:
The letters in parentheses after each substance represent their states of matter in the reaction equation. In this reaction, sodium in solid state reacts with oxygen in gas state to form sodium oxide in solid state.
Explanation:
In the balanced equation 4 Na(s) + O2(g) → 2 Na2O(s), the letters in parentheses after each substance represent their states of matter. (s) stands for solid, (g) stands for gas. In this reaction, sodium (Na) in solid state reacts with oxygen (O2) in gas state to form sodium oxide (Na2O) in solid state.
The letters in parentheses denote states of matter: (s) for solid, (g) for gas, at room temperature and standard pressure.
The letters in parentheses after each substance in the chemical equation represent the state of matter for each reactant and product at room temperature and standard pressure. Here is what they stand for:
Na(s) stands for sodium in the solid state.
O₂(g) stands for oxygen in the gaseous state.
Na₂O(s) stands for sodium oxide in the solid state.
The balanced chemical equation provided is:
[tex]\[ 4 \text{Na}(s) + \text{O}_2(g) \rightarrow 2 \text{Na}_2\text{O}(s) \][/tex]
This equation indicates that four moles of solid sodium react with one mole of gaseous oxygen to produce two moles of solid sodium oxide.
When 131.0 mL of water at 26.0°C is mixed with 81.0 mL of water at 85.0°C, what is the final temperature? (Assume that no heat is lost to the surroundings; d of water is 1.00 g/mL.)
Answer:
63.52°C is the final temperature
Explanation:
1) 131.0 mL of water at 26.0°C
Mass of water = m
Volume of the water =131.0 mL
Density of the water = 1.00 g/mL
[tex]Density=1.00 g/mL=\frac{m}{131.0 mL}[/tex]
m = 131.0 g
Initial temperature of the water = [tex]T_i[/tex] = 26.0°C
Final temperature of the water = [tex]T_f[/tex]
Change in temperature ,[tex]\Delta T=T_f-T_i[/tex]
Heat absorbed 131.0 g of water = Q
[tex]Q=m\times c\times \Delta T[/tex]
2) 81.0 mL of water at 85.0°C
Mass of water = m'
Volume of the water =81.0 mL
Density of the water = 1.00 g/mL
[tex]Density=1.00 g/mL=\frac{m'}{81.0 mL}[/tex]
m' = 81.0 g
Initial temperature of the water = [tex]T_i'[/tex] = 85.0°C
Final temperature of the water = [tex]T_f'[/tex]
Change in temperature ,[tex]\Delta T'=T_f'-T_i'[/tex]
Heat lost by 81.0 g of water = Q'
[tex]Q'=m'\times c\times \Delta T'[/tex]
After mixing both liquids the final temperature will become equal fro both liquids.
[tex]T_f=T_f'[/tex]
Since, heat lost by the water at higher temperature will be equal to heat absorbed by the water at lower temperature.
Q=-Q' (Law of conservation of energy.)
Let the specific heat of water be c
[tex]m\times c\times \Delta T=m'\times c\times \Delta T'[/tex]
[tex]131.0 g\times c(T_f-26^oC)=-(81.0.0 g\times c(T_f-85^oC))[/tex]
[tex]T_f=63.52^oC[/tex]
63.52°C is the final temperature
According to conservation law, the amount of energy in a closed and isolated system remains constant and does not get reduced or added. The final temperature of the system is 63.52°C.
What are mass and temperature?First, calculate the mass of the 131 mL of water:
Given,
Mass (m)= ?Volume (V)= 131.0 mLDensity = 1.00 g/ml[tex]\begin{aligned}\rm Mass &= \rm Volume \times \rm density\\\\\rm m &= 131.0 \;\rm g\end{aligned}[/tex]
Given,
Initial temperature [tex]\rm (T_{i})[/tex] = 26.0°C
The final temperature of the water = [tex]\rm (T_{f})[/tex]
Change in the temperature is calculated as,
[tex]\rm \Delta T = T_{f} - T_{i}[/tex]
Heat absorbed by 131.0 g of water = Q
The formula to calculate heat absorbed is,
[tex]\rm Q = m \times c \times \Delta T[/tex]
Second, calculate the mass of the 81 mL of water:
Given,
Mass (m') = ?Volume (V')= 81.0 mLDensity = 1.00 g/ml[tex]\begin{aligned}\rm Mass' &= \rm Volume \times \rm density\\\\\rm m' &= 81.0 \;\rm g\end{aligned}[/tex]
Given,
Initial temperature [tex]\rm (T'_{i})[/tex] = 26.0°C
The final temperature of the water = [tex]\rm (T'_{f})[/tex]
Change in the temperature is calculated as,
[tex]\rm \Delta T' = T'_{f} - T'_{i}[/tex]
Heat lost by 81.0 g of water = Q'
The formula to calculate heat lost is,
[tex]\rm Q' = m' \times c \times \Delta T'[/tex]
Both the liquids are mixed and the final temperature will be equivalent and given as, [tex]\Delta \rm T_{f} = \Delta T'_{f}[/tex]
According to the law of conservation,
Heat lost by the water (Q') = Heat absorbed by the water (-Q)
[tex]\begin{aligned}\rm m \times c \times \Delta T &= \rm m' \times c \times \Delta T'\\\\131 \times\rm c(T_{f} -26) &= -(81 \times\rm c(T_{f}- 85))\\\\\rm T_{f} &= 63.52 \circC\end{aligned}[/tex]
Therefore, 63.52°C is the final temperature.
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ATF fluid should be A. red. B. yellow. C. green. D. blue.
ATF fluid should be A. Red
Answer:
According to Chemical Composition, the answer is A. red.
Explanation:
CH4 (g) yields C(g) + 4H (g) (reaction for expansion)
Compare the reaction for the "expansion" of methane with the reverse of the reaction that represents the standard enthalpy of formation. Which properties are the same for both reactions and which are different?
1. the number of atoms of each element, 2. the state of the methane molecules, 3. the enthalpy change of the reaction, 4. the state of the carbon atoms.
Answer:
Here's what I find.
Explanation:
[tex]\rm CH$_{4}$(g) $\, \rightleftharpoons \,$ C(g) + 4H(g)[/tex]
[tex]\text{Same} =\begin{cases}1. & \text{The number of atoms of each element}\\2. & \text{The state of the methane molecules}\\4. &\text{The state of the carbon atoms}\\\end{cases}[/tex]
[tex]\text{Different} =\begin{cases}3. & \text{The enthalpy change of the reaction}\\\end{cases}[/tex]
The sign of ΔH changes when you reverse the reaction.
Answer:
Same:
-the number of atoms
of each element
-the state of the
methane molecules
Different:
-the state of the
carbon atoms
-the enthalpy change
of the reaction
Explanation:
The enthalpy changes are different for the two reactions even though all the same elements are involved in equal numbers. This illustrates that the enthalpy change of a reaction is dependent on the states of the reactants and products, as well as how the atoms are bonded.
Calculate the concentration of H3O⁺ in a solution that contains 5.5 × 10-5 M OH⁻ at 25°C. Identify the solution as acidic, basic, or neutral. A) 1.8 × 10-10 M, basic B) 1.8 × 10-10 M, acidic C) 5.5 × 10-10 M, neutral D) 9.2 × 10-1 M, acidic E) 9.2 × 10-1 M, basic
Answer : The correct option is, (A) [tex]1.8\times 10^{-10}M[/tex], basic.
Explanation : Given,
Concentration of [tex]OH^-[/tex] ion = [tex]5.5\times 10^{-5}M[/tex]
First we have to calculate the pOH.
[tex]pOH=-\log [OH^-][/tex]
[tex]pOH=-\log (5.5\times 10^{-5})[/tex]
[tex]pOH=4.26[/tex]
Now we have to calculate the pH.
[tex]pH+pOH=14\\\\pH=14-pOH\\\\pH=14-4.26=9.74[/tex]
Now we have to calculate the [tex]H_3O^+[/tex] concentration.
[tex]pH=-\log [H_3O^+][/tex]
[tex]9.74=-\log [H_3O^+][/tex]
[tex][H_3O^+]=1.8\times 10^{-10}M[/tex]
As we know that, when the pH value is less than 7 then the solution acidic in nature and when the pH value is more than 7 then the solution basic in nature.
From the pH value, 9.74 we conclude that the solution is basic in nature because the value of pH is greater than 7.
Therefore, the [tex]H_3O^+[/tex] concentration is, [tex]1.8\times 10^{-10}M[/tex], basic.
When water dissociates, each water molecule splits into a hydroxide ion and ______. A) H 3 O + B) a hydrogen atom C) a hydrogen ion D) H 2 O E) OH —
Answer: The correct answer is Option C.
Explanation:
Water is a molecule which is formed by the combination of hydrogen and oxygen atoms. The chemical formula for this is [tex]H_2O[/tex]
Ionization is a special type of dissociation process. It is defined as the process in which a molecules splits into its ions.
When water dissociates, it leads to the formation of 2 ions, which are hydroxide ion and hydrogen ion.
The chemical equation for ionization or dissociation of water molecule is:
[tex]H_2O(l)\rightarrow H^+(aq.)+OH^-(aq.)[/tex]
Hence, the correct answer is Option C.
When water dissociates, it splits into a hydroxide ion and a hydrogen ion (H+), which then often forms a hydronium ion (H3O+) in the presence of other water molecules.
Explanation:When water dissociates, each water molecule splits into a hydroxide ion and a hydrogen ion (H+). This is represented by the chemical equation:
H2O (l) → H+ (aq) + OH− (aq)
The molecule that receives a proton (H+) becomes the hydronium ion (H3O+), and the part that loses the proton becomes the hydroxide ion (OH−). The correct answer to the question is thus letter C) a hydrogen ion.
100 mL of a 0.300 M solution of AgNO3 reacts with 100 mL of a 0.300 M solution of HCl in a coffee-cup calorimeter and the temperature rises from 21.80 °C to 23.20 °C. Assuming the density and specific heat of the resulting solution is 1.00 g/mL and 4.18 J/g ∙ °C, respectfully, what is the ΔH°rxn?
Answer:
ΔH°rxn = 39013.33 J/mol = 39.013 kJ/mol.
Explanation:
We can calculate the amount of heat (Q) released from the solution using the relation:Q = m.c.ΔT,
Where, Q is the amount of heat released from the solution (Q = ??? J).
m is the mass of the solution (m of the solution = density of the solution x volume of the solution = (1.0 g/mL)(200 mL) = 200 g.
c is the specific heat capacity of the solution (c = 4.18 J/g∙°C).
ΔT is the difference in the T (ΔT = final temperature - initial temperature = 23.20 °C - 21.80 °C = 1.4 °C).
∴ Q = m.c.ΔT = (200 g)(4.18 J/g∙°C)(1.4 °C) = 1170.4 J.
∵ ΔH°rxn = Qrxn/(no. of moles of AgNO₃).
Molarity (M) is defined as the no. of moles of solute dissolved in a 1.0 L of the solution.
M = (no. of moles of AgNO₃)/(Volume of the solution (L)).
∴ no. of moles of AgNO₃ = (M)(Volume of the solution (L)) = (0.3 M)(0.1 L) = 0.03 mol.
∴ ΔH°rxn = Qrxn/(no. of moles of AgNO₃) = (1170.4 J)/(0.03 mol) = 39013.33 J/mol = 39.013 kJ/mol.
The heat of reaction (ΔH°rxn) for this chemical reaction in a coffee-cup calorimeter is -19.508 kJ/mol, indicating an exothermic reaction.
Explanation:In this question, we need to calculate the heat change (ΔH°rxn) of a chemical reaction in a coffee cup calorimeter. The reaction has a temperature rise from 21.80 °C to 23.20 °C. This increase in temperature represents an exothermic reaction, which means heat is released in the process.
We can calculate the heat absorbed by using the equation q = mcΔT, where m is the mass, c is the specific heat, and ΔT is the change in temperature. Given that the density of the solution is 1.00 g/mL and the volume is 200 mL (100 mL of AgNO3 + 100 mL of HCl), our m = 200 g. The specific heat c is given as 4.18 J/g ∙ °C. With ΔT = final temperature - initial temperature = 23.20 °C - 21.80 °C = 1.40 °C, we find that q = (200 g)(4.18 J/g ∙ °C)(1.40 °C) = 1170.48 J.
ΔH°rxn is given per mole of reaction, so let's convert the heat released to kJ (1.17048 kJ) and the reaction to moles using the 0.300 M concentration. In this reaction, 1 mol of AgNO3 reacts with 1 mol of HCl. So the molar quantity in 200 mL solution is 0.3 mol/L * 0.2 L = 0.06 mol. Then the ΔH°rxn = 1.17048 kJ / 0.06 mol = 19.508 kJ/mol (Note that this value is negative as it is an exothermic reaction).
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