Answer:
Mole fraction of methanol: 0.5898Mole fraction of ethanol: 0.4102Explanation:
The mole fraction of a component is the ratio of the number of moles of the component to the total number of moles of the solution.
X of component A = number of moles of component A / number of moles of all components.Now, the number of moles of each component is determined from its molar mass as:
Number of moles = mass in grams / molar mass.Thus, you can write:
Number of moles CH₄O = mass CH₄O / molar mass CH₄OMolar mass CH₄O = 32.04 g/mol
Number of moles CH₄O = mass CH₄O / 32.04 g/mol
Number of moles of C₂H₆O = mass of C₂H₆O / molar mass of C₂H₆OMolar mass C₂H₆O = 46.07 g/mol
Number moles C₂H₆O = mass of C₂H₆O / 46.07 g/mol
Since both masses are equal, call them m.
Number of moles CH₄O = m / 32.04Number of moles C₂H₆O = m / 46.07Total number of moles = m / 32.04 + m / 46.07Mole fraction of CH₄O = [ m / 32.04 ] / [ m / 32.04 + m / 46.07]
m is common factor of the numerator and the denominator, so they cancel out, and you get:[ 1 / 32.04] / [1 / 32.04 + 1 /46.07] = 0.5898
Since, the sum of the mole fractions of all the components is 1 and there are only two components:
Mole fraction of C₂H₆O = 1 - 0.5898 = 0.4102
Those numbers are rounded to four significant figures.
a solution containing the maximum amount of solute that can be dissolved at a given temperature is ____
Answer:
A saturated solution
Explanation:
A saturated solution is a solution which has dissolved as much solute as it can dissolve at a given temperature. If more solutes are added, a saturated solution would not dissolve it. Such solution has reached its carrying capacity.
If the temperature changes, the solution might be able to dissolve more solutes in it.
An undersaturated solution is one in which does not contain enough dissolved solutes in it at a given temperature.
At which point was neutralization complete for the acid that is being titrated below?
A
B
C
D
Answer:
D.
Explanation:
From the shown titration curve, It is a titration curve for a diprotic acid (H₂A).The neutralization of the first proton is at point A.The neutralization of the second proton (complete neutralization) is at point D.So, the right choice is: D.
D on e2020
extra words to get to 20 letters
Why is caffeine more soluble in dichloromethane compared to water?
Answer:
Caffeine would require a non-polar solvent to dissolve it
Explanation:
The general rule of solubility is that "like dissolves like". Polar solvents would dissolve polar solutes and non-polar solvents would dissolve non-polar solute.
Water is a polar solvent and would readily dissolve polar compounds such as the range of ionic/electrovalent compound like NaCl and polar covalent compounds.
For non-polar solutes, compounds like dichloromethane would readily dissolve them. Both caffeine and this solvent are both organic compound and would interact readily with one another. Although this compound is slightly polar, it would readily dissolve caffeine
Partial polar nature of Caffeine make it more soluble in less polar solvent such as dichloromethane as compared to water.
Why is caffeine more soluble in dichloromethane?Caffeine is partially polar and we know that water is more polar solvent than dichloromethane which causes caffeine more soluble in dichloromethane compared to water so we can conclude that partial polar nature of Caffeine make it more soluble in less polar solvent such as dichloromethane as compared to water.
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Click the "draw structure" button to launch the drawing utility. draw the product of the reaction below. do not specify the stereochemistry of the product.
The question asks for the product structure of a reaction to be drawn using a utility. Somewhat, it isn't possible to provide a drawn response without the reaction details and the specific utility. However, in general, recognizing the reactants, the type of reaction, and consequently sketching the product guidance was given.
Explanation:The current question pertains to a chemical reaction product and the drawing of its structure using a specific utility. Unfortunately, without an image of the reaction and the platform's drawing utility unattainable here, an explicit 'drawn' response isn't feasible. However, the request to not specify stereochemistry suggests that your interest is mainly in the skeletal structure.
Generally, in organic chemistry, you'd discern the reactants, identify the type of reaction (such as addition, substitution, or elimination), and consequently draw the product by connecting atoms according to the reaction rules. The stereochemistry, which refers to the three-dimensional arrangement of the atoms, isn't a concern in this case.
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Which of the following could cause a gaseous substance to liquify?
F, An increase in pressure
G, An increase in volume
H, An increase in temperature
J, A decrease in number of moles
Answer:
f
Explanation:
pressure
What volume of a 6.67 M NaCl solution contains 3.12 mol NaCl? L
Answer:
0.47dm³
Explanation
Given parameters :
Molarity of NaCl = 6.67M
Number of moles = 3.12mol
Volume of NaCl =?
Volume of NaCl = number of moles/Molarity
Volume of NaCl = 3.12mol/6.67M
Volume of NaCl = 0.47dm³
Answer:
0.468
Explanation: got it right on edge
Any organism or particle that can cause an infectious disease is called a
bacteriavirusviroidpathogen
Answer:
PATHOGEN.
Explanation:
In biology, pathogen refers to any organism or particle that is capable of causing infectious diseases. Thus, all the microbes that cause diseases such as bacteria, virus, fungi, viroid, etc are collectively known as pathogen. The entrance of pathogen into the human body usually stimulate the immune system. The immune system functions by recognizing pathogens and by capturing and destroying them.
What has the higher specific heat, a metal spoon or a wooden spoon?
How can you tell?
Answer:
metal spoon
Explanation:
Metals are good conductors of heat and electricity and they have high boiling and melting points
Final answer:
A wooden spoon has a higher specific heat than a metal spoon because it requires more energy to change its temperature. Metals conduct heat better and thus heat up and cool down more quickly compared to wood, indicating a lower specific heat for the metal.
Explanation:
The specific heat of a substance is a measure of how much energy is required to raise the temperature of 1 gram of that substance by 1°C. A wooden spoon would typically have a higher specific heat than a metal spoon. This is because metals generally conduct heat better and require less energy to change their temperature compared to wood. This property is why a metal spoon heats up quickly when placed in a hot environment, feeling much warmer to the touch compared to a wooden spoon in the same conditions.
To understand which material has the higher specific heat, we can refer to the principle that objects with greater specific heat require more energy to change their temperature. When comparing a metal to wood, the metal's temperature tends to change more quickly due to its lower specific heat, thus it heats up and cools down faster than wood.
How many moles of Al(OH)^3 is in 12.4 g of aluminum hydroxide?
Answer:
0.1589 mol ≅ 0.16 mol.
Explanation:
Knowing that the no. of moles can be calculated using the relation:no. of moles (n) = mass/molar mass
mass of Al(OH)₃ = 12.4 g & molar mass of Al(OH)₃ = 78.01 g/mol.
∴ n = mass/molar mass = (12.4 g)/(78.01 g/mol) = 0.1589 mol ≅ 0.16 mol.
What is the mass of 3.20×10^23 fotmula units of fe2o3
To determine the mass of SO₃ that can react with 3.59 mol of Fe₂O₃, we use the molar ratio from the balanced equation and the molar mass of SO₃ to find that 862 g of SO₃ are needed.
To find out how many grams of SO₃ can react with 3.59 mol of Fe₂O₃, we follow a two-step mole-mass calculation process. The balanced chemical equation Fe₂O₃ +3SO₃
ightarrow Fe₂(SO₄)₃ provides us with the molar ratio needed for this calculation. For every mole of Fe₂O₃, three moles of SO₃ are required. So, we multiply the number of moles of Fe₂O₃ (3.59 mol) by three to find the moles of SO₃needed.
Once we have the number of moles of SO₃, we then use the molar mass of SO₃ to find the mass. The molar mass of SO₃ is 80.066 g/mol. After calculating the number of moles of SO3, we can then multiply by this molar mass to get the final weight of SO₃ that can react with 3.59 mol of Fe₂O₃. Applying this method, we calculate that 862 g of SO₃ will react with 3.59 mol of Fe₂O₃.
What characteristics are shared by all alkali metals and alkaline earth metals?
Alkali metals and alkaline earth metals share similar chemical properties. Alkali metals have a single valence electron which they easily lose, while alkaline earth metals have two valence electrons. Alkali metals are more reactive than alkaline earth metals.
Explanation:Alkali metals and alkaline earth metals share several characteristics. Both alkali metals (such as lithium, sodium, and potassium) and alkaline earth metals (such as calcium, strontium, and barium) have similar chemical properties. They are shiny, good conductors of heat and electricity, and have similar reactivity. However, alkali metals are more reactive than alkaline earth metals. Alkali metals have a single valence electron in their outermost shell which they easily lose, while alkaline earth metals have two valence electrons.
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What is the most abundant chemical element in the universe?
hydrogen is the most
Hydrogen is the most abundant element in the universe, making up about 90% of atoms. Helium is the second most abundant. These two elements dwarf the prevalence of all other elements combined.
The most abundant chemical element in the universe is hydrogen. Accounting for approximately 90% of atoms, hydrogen's prevalence surpasses all other elements. This elemental dominance extends to the composition of stars, including our sun, where hydrogen serves as a primary fuel for stellar processes. Following hydrogen, helium constitutes most of the remaining 10%, and all other elements appear in far lesser quantities. Hydrogen plays a significant role on Earth as well, being a part of countless compounds such as water, which is the most widespread compound of hydrogen on our planet.
Write a balanced equation for the combustion reaction that occurs between propane and oxygen.
Answer:
Explanation:
The reaction between propane and oxygen is a combustion process for an hydrocarbon.
The formula of propane is given as C₃H₈ and oxygen is written as O₂
For this combustion reaction, the general equation is given as:
Cₓ[tex]H_{y}[/tex] + (x + [tex]\frac{y}{4}[/tex])O₂ → xCO₂ + [tex]\frac{y}{2}[/tex]H₂O
In the reaction between propane and oxygen,
x = 3
y = 8
The reaction is then written as:
C₃H₈ + (3 +[tex]\frac{8}{4}[/tex])O₂ → 3CO₂ + [tex]\frac{8}{2}[/tex]H₂O
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Answer:
[tex]\huge \boxed{\mathrm{C_3 H_8 +5O_2 \Rightarrow 3CO_2 +4 H_2 O}}[/tex]
[tex]\rule[225]{225}{2}[/tex]
Explanation:
[tex]\sf C_3 H_8 +O_2 \Rightarrow CO_2 + H_2 O[/tex]
Balancing Carbon atoms on the right side,
[tex]\sf C_3 H_8 +O_2 \Rightarrow 3CO_2 + H_2 O[/tex]
Balancing Hydrogen atoms on the right side,
[tex]\sf C_3 H_8 +O_2 \Rightarrow 3CO_2 +4 H_2 O[/tex]
Balancing Oxygen atoms on the left side,
[tex]\sf C_3 H_8 +5O_2 \Rightarrow 3CO_2 +4 H_2 O[/tex]
[tex]\rule[225]{225}{2}[/tex]
HELP ASAP PLEASE!!!
Explain why molecules of alkenes and alkynes must have at least two carbon atoms while alkanes may contain only one carbon atoms.
Answer:
Because alkenes and alkynes are defined as molecules with at least one double (in the case of alkenes) or triple (in the case of alkynes) bond between two carbon atoms, while alkanes have only single bonds between any pair of carbon atoms.Explanation:
Alkenes and alkynes are unsaturated molecules, because they have, at least, two adjacent carbon atoms bonded together by either a doubler or a triple bond: - C = C - or - C ≡ C -.
Hence, at least two carbon atoms are needed to form those double or triple bonds, while alkanes have only single bonds. The example of alkane with only one carbon atom is methane: CH₄, which is the most simple alkane.
The most simple alkene is CH₂ = CH₂, and the most simple alkyne is CH≡CH.
As you see, the very definition of alkenes and alkynes forces that those molecules must have at least two carbon atoms.
Atoms that gain or lose electrons are called
Answer:
ions
Explanation:
An atom that has gained or lost an electron is called an ion. Ions are charged particles that have lost or added an electron to their outermost shell. Ions are the basis of any chemical reaction. The combination of ions leads to the formation of bonds between atoms and this results in molecules and compounds.
When atoms are in their ground state, they are otherwise neutral and such would not combine chemically. It is difficult to find elements in such form naturally. Atoms that have ionized by losing or gaining electrons would freely combine with one another in order to establish a more stable configuration.
Florida has been spending money to create storm shelters. The state is preparing for . California has been spending money to establish desalination plants. The state is preparing for . NextReset
Answer:answer is hurricane and floods
Explanation:
your welcome ;)
Answer:
Florida is preparing for a hurricane, and California is preparing for drought conditions.
Explanation:
A kind of storm in which the high current winds produces a circular cone mass and damages anything that comes in its way is known as a hurricane. The Florida state is producing shelters in order to develop protection in response to a hurricane.
A condition in which an area possesses a shortage of water at the surface, atmospheric, and the ground level is known as a drought. The development of desalination plants will assist in withdrawing salt from accessible water from sea, ocean, or lake. So that the water from these sources can be utilized for drought situations. Thus, California State is spending money for the development of desalination plants in order to prepare for droughts.
Only element in the halide family that is a liquid. What is this element
Answer:
Bromine.
Explanation:
That is bromine which is a dark red vaporous liquid with a bad smell. There are only 2 elements which are liquid at room temperature, bromine and mercury.
Match the correct term with its definition. The color of the powder of a mineral. Answer 1 The sinking of one lithospheric plate beneath another. Answer 2 A process that includes both the disintegration and decomposition of surface rock material. Answer 3 The chemical altering of the composition of the material. Answer 4 How much matter is in a certain amount of space; mass divided by volume. Answer 5 The physical or mechanical breakdown of Earth's materials. Answer 6 Movement of Earth's materials by glacial action. Answer 7 The ability of a mineral to resist scratching. Answer 8 A type of igneous rock that forms inside the Earth. Answer 9 The rock formed by the cooling and solidifying of molten rock.
Answer:
Explanation:
1.The color of the powder of a mineral.
Answer 1 : Streak
Streak is the color displayed by a mineral in powdered form. The streak of some minerals differs from their original color.
2.The sinking of one lithospheric plate beneath another.
Answer 2 : Subduction
At a convergent margin, a denser lithospheric plate falls beneath the lighter one in a process called subduction. This region is called the subduction zone.
3.A process that includes both the disintegration and decomposition of surface rock material.
Answer 3: Weathering
Weathering is defined as the physical disintegration and chemical decomposition of rocks to form soils and sediments on the earth surface.
4.The chemical altering of the composition of the material.
Answer 4: Chemical weathering
It is the decomposition or altering of earth materials chemically.
5. How much matter is in a certain amount of space; mass divided by volume.
Answer 5 : Density
Density is defined as the mass per unit volume.
6. The physical or mechanical breakdown of Earth's materials.
Answer 6: Physical weathering
Physical weathering is the disintegration of earth materials using mechanical means.
7. Movement of Earth's materials by glacial action.
Answer 7: Glacial erosion
This is the wearing and washing away of earth's materials by action of moving glaciers.
8. The ability of a mineral to resist scratching.
Answer 8: Hardness
Hardness is expressed in an ability to resist deformation and any from of abrasion
9. A type of igneous rock that forms inside the Earth.
Answer 9: Plutonic or intrusive igneous rocks
Igneous rocks that forms within the crust are called plutonic or intrusive igneous rocks.
10. The rock formed by the cooling and solidifying of molten rock.
Answer 10: Igneous rocks
Igneous rocks are rocks that formed from cooling and solidifying of molten rocks
The color of the powder of a mineral is called streak. Subduction is the sinking of one lithospheric plate beneath another. Weathering is the process that includes both the disintegration and decomposition of surface rock material.
Explanation:The color of the powder of a mineral is called the streak.
The sinking of one lithospheric plate beneath another is called subduction.
The process that includes both the disintegration and decomposition of surface rock material is called weathering.
The chemical altering of the composition of a material is called chemical weathering.
The amount of matter in a certain amount of space is called density, which is determined by dividing mass by volume.
The physical or mechanical breakdown of Earth's materials is called mechanical weathering.
The movement of Earth's materials by glacial action is called glacial erosion.
The ability of a mineral to resist scratching is called hardness.
A type of igneous rock that forms inside the Earth is called intrusive igneous rock.
The rock that forms from the cooling and solidifying of molten rock is called igneous rock.
A balanced chemical equation used to prepare ammonium carbonate, (nh4)2co3 , is: 2 n h 3 ( g ) + c o 2 ( g ) + h 2 o ( l ) ⟶ ( n h 4 ) 2 c o 3 which choice of reactant quantities shown below would result in the greatest amount of ammonium carbonate being formed?
Final answer:
The greatest amount of ammonium carbonate is produced when reactants NH3, CO2, and H2O are used in the mole ratio of 2:1:1, ensuring an excess of water.
Explanation:
To determine the reactant quantities that would result in the greatest amount of ammonium carbonate being formed, we must look at the stoichiometry of the balanced chemical equation provided:
2NH3(g) + CO2(g) + H2O(l) → (NH4)2CO3
According to this equation, therefore, the greatest amount of ammonium carbonate will be produced when reactants are supplied in the mole ratio of 2:1:1 for NH3:CO2:H2O, respectively. Choosing reactant quantities that provide ammonia and carbon dioxide in at least this ratio, while ensuring an excess of water, would maximize production of ammonium carbonate.
In chemistry, there are three commonly encountered theories to explain what acids and bases are and what they do. Name these theories and describe what each one states about acids and bases. Give an example to help describe each of the types. Make sure to explain how these theories differ from each other. (Properties of Acids and Bases)
Answer: The theories are such that if any chemical produce H+ ion then it is an acid and if the chemical produces OH- ion then it's a base.
Explanation:
sorry I am not that much knowledgeable like all of you
The British gold sovereign coin is an alloy of gold and copper having a total mass of 7.988 g, and is 22-karat gold. (a) Find the mass of gold in the sovereign in kilograms using the fact that the number of karats = 24 (mass of gold)/(total mass). kg (b) Calculate the volumes of gold and copper, respectively, used to manufacture the coin. volume of gold Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. m3 volume of copper Your response differs significantly from the correct answer. Rework your solution from the beginning and check each step carefully. m3 (c) Calculate the density of the British sovereign coin. kg/m3
Answer:
(a) Mass of gold = 0.0073223 kg.
(b) V of gold 3.79 x 10⁻⁷ m³ & ∴ V of copper = 7.438 x 10⁻⁸ m³.
(c) The density of the British sovereign coin 17,620 kg/m³.
Explanation:
(a) Find the mass of gold in the sovereign in kilograms using the fact that the number of karats = 24 (mass of gold)/(total mass).
∵ the number of karats = 24 (mass of gold)/(total mass)
the number of karats = 22-karat gold,
mass of gold = ??? g,
total mass = 7.988 g.
∴ mass of gold = (the number of karats)(total mass)/24 = (22)(7.988 g)/(24) = 7.3223 g = 0.0073223 kg.
(b) Calculate the volumes of gold and copper, respectively.
∵ Mass of coin = 7.988 g.
∵ mass of gold = 7.3223 g.
∴ mass of Cu = Mass of coin - mass of gold = 7.988 g - 7.3223 g = 0.6657 g = 0.6657 x 10⁻³ kg.
To find the volume of Copper and gold, we can use the relation:V = m/d.
where, V is the volume of the material,
m is the mass of the material,
d is the density of the material.
For gold:Density of gold = 19,320 kg/m³, mass of gold = 0.0073223 kg.
∴ V of gold = m/d = (0.0073223 kg)/(19,320 kg/m³) = 3.79 x 10⁻⁷ m³.
For copper:
Density of copper = 8,950 kg/m³, mass of copper = 0.6657 x 10⁻³ kg.
∴ V of copper = m/d = (0.6657 x 10⁻³ kg)/(8,950 kg/m³) = 7.438 x 10⁻⁸ m³.
(c) Calculate the density of the British sovereign coin. kg/m³.
To find the density of the British sovereign coin, we can use the relation:d = m/V.
mass of the British sovereign coin = 7.988 g = 0.007988 kg.
Volume of the British sovereign coin = V of gold + V of copper = (3.79 x 10⁻⁷ m³) + (7.438 x 10⁻⁸ m³) = 4.534 x 10⁻⁷ m³.
∴ Density of the British sovereign coin = m/V = (0.007988 kg)/(4.534 x 10⁻⁷ m³) = 17,620 kg/m³.
Based on the relationships between mass, volume and density;
mass of gold in the sovereign is 0.0073223 kgthe volume of gold is 3.79 x 10⁻⁷ m³ while the volume of copper is 7.438 x 10⁻⁸ m³the density of the British sovereign coin 17,620 kg/m³.What is the the relationships between mass, volume and density?The mass, volume and density of a substance are related by the formula given below:
Density = mass/volumea) Using the fact that the number of karats = 24 (mass of gold)/(total mass). kg;
the number of karats = 24 (mass of gold)/(total mass)
the number of karats = 22-karat gold,
total mass = 7.988 g.
mass of gold = (the number of karats)(total mass)/24mass of gold = (22)(7.988 g)/(24) = 7.3223 g
mass of gold = 0.0073223 kg.
(b) The volume of gold and copper are calculated thus:
Mass of coin = 7.988 g.mass of gold = 7.3223 g.mass of copper = Mass of coin - mass of gold
mass of copper = 7.988 g - 7.3223 g = 0.6657 g
mass of copper = 0.6657 x 10⁻³ kg.
From the formula above:
Volume = mass /densityThus;
Density of gold = 19,320 kg/m³, mass of gold = 0.0073223 kg.
Volume of gold = 0.0073223 kg/19,320 kg/m³
Volume of gold = 3.79 x 10⁻⁷ m³
Also,
Density of copper = 8,950 kg/m³, mass of copper = 0.6657 x 10⁻³ kg.
volume of copper = (0.6657 x 10⁻³ kg)/(8,950 kg/m³)
Volume of copper = 7.438 x 10⁻⁸ m³.
(c) the density of the British sovereign coin is then calculated using the formula:
density = mass/volumemass of the British sovereign coin = 7.988 g = 0.007988 kg.
Volume of the British sovereign coin = volume of gold + volume of copper = (3.79 x 10⁻⁷ m³) + (7.438 x 10⁻⁸ m³) = 4.534 x 10⁻⁷ m³.
Then;
Density of the British sovereign coin = (0.007988 kg)/(4.534 x 10⁻⁷ m³)
Density of the British sovereign coin = 17,620 kg/m³.
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Water is capable of dissolving a variety of different substances, which is why it is such a good solvent. It is often called the universal solvent because it dissolves more substances than any other liquid. The reason for this is best explain by which of these? A) Water is polar with a positive and negative side. B) Water is the most abundant liquid on earth. C) Water bonds with most chemicals. D) Water expands as it freezes.
Answer:
Explanation:
In this case the answer would be
Water is a polar molecule with positive and negative side
Now since these negative and positives are present in the water molecule . In easy terms when a substance reacts with water .the negative part of water ( oxygen ) reacts with the positive part of the substance and the positive part of the water ( hydrogen) reacts with negative part of the substance .if you look at the reason . Water is held up by one of the strongest attraction forces available .since most substances have weaker attraction forces between them ,therefore water can easily overcome them with its forces. Thus giving it the ability to dissolve a variety of substances
Answer:
d
Explanation:
edge 2020
A solution containing HCl and the weak acid HClO2 has a pH of 2.4. Enough KOH (aq) is added to the solution to increase the pH to 10.5. The amount of which of the following species increases as the KOH (aq) is added? A)Cl- (aq) B)H+ (aq) C)ClO2- (aq) d)HClO2 (aq)
Answer:
[tex]\boxed{\rm \text{[ClO$_{2}^{-}$] increases}}[/tex]
Explanation:
At the beginning, you have two reactions happening:
[tex]\rm HCl + H$_{2}$O$ $\, \longrightarrow \,$ H$_{3}$O$^{+}$ + Cl$^{-}$\\\rm HClO$_{2}$ + H$_{2}$O$ $\, \rightleftharpoons \,$ H$_{3}$O$^{+}$ + ClO$_{2}^{-}$[/tex]
As you add KOH(aq), it does two things:
It increases the volume of the solution. It reacts with the hydronium ions to form water.A) The HCl is completely ionized. The Cl⁻ does not react, but it is diluted when the volume of the solution increases. [Cl⁻] decreases.
B) The KOH reacts with the H⁺ and removes it from the solution. [H⁺] decreases.
C) When all the H⁺ from the HCl has been neutralized, the KOH starts neutralizing the H⁺ from the HClO₂. According to Le Châtelier's Principle, more HClO₂ will dissociate to replace the decreased H⁺. [HClO₂] decreases.
D) As HClO₂ reacts, it forms ClO₂⁻. [tex]\boxed{\rm \textbf{[ClO$_{2}^{-}$] increases}}[/tex]
The amount of ClO2- increases as aqueous KOH is added.
AcidsAcids are substances which donate hydrogen ions or protons in aqueous solutions. Acids can either be strong or weak.Strong acids ionize completely in solution to produce hydrogen ions.
Weak acids only ionize partially in solution to produce hydrogen ions.
HCl is a strong acid and ionizes completely to produce hydrogen and chloride ions.HClO2 is a weak acid and only ionizes partially.When aqueous KOH is added to a mixture of HCl and HClO2, the follow occurs:
Hydrogen ions from HCl are removed, hence H+ reduces.Cl- amount remains the same but is diluted as the volume of solution increases.ClO2- increases as the hydrogen ions are removed from the partially ionized HClO2.HClO2 decreases due to equilibrium shift towards formation of more H+ and ClO2-Therefore, the amount of ClO2- increases as aqueous KOH is added.
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When taphonomy records show a short PMI and warm, humid conditions, the degree of certainty is probably _____.
not even closedefinitelowhigh
The degree of certainty is high.
Answer:
The correct answer is "high".
Explanation:
Taphonomy is the science that studies how organic matter decays and becomes fossilized. Forensic taphonomy is used to estimate the characteristics of a person's death, with tests with levels of certainty depending on multiple factors. If a sample has a short PMI (Postmortem Interval), warm and humid conditions, the degree of certainty is probably high because the conditions are ideal to preserve an organic sample.
Under certain circumstances, carbon dioxide, CO2(g), can be made to react with hydrogen gas, H2(g), to produce methane, CH4(g), and water vapor, H2O(g): CO2(g)+4H2(g)→CH4(g)+2H2O(g)Part A How many moles of methane are produced when 59.6 moles of carbon dioxide gas react with excess hydrogen gas? Express your answer with the appropriate units. For example, write the unit moles as mol.Part B How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 42.1 moles of water vapor? Express your answer with the appropriate units. For example, write the unit moles as mol.
These are two questions and two answers.
Answers:
Part A: 59.6 mol CH₄Part B: 84.2 mol H₂ (g)Explanation:
1) Balanced chemical equation (given):
CO₂(g) + 4H₂(g) → CH₄(g) + 2H₂O(g)2) Part A: How many moles of methane are produced when 59.6 moles of carbon dioxide gas react with excess hydrogen gas?
a) Mole ratios:
1 moles CO₂(g) : 1 mole CH₄(g)b) Proportion:
1 moles CO₂ / 1 mol CH₄ = 59.6 moles CO₂ / x⇒ x = 59.6 mol CH₄ ← answer
3) Part B How many moles of hydrogen gas would be needed to react with excess carbon dioxide to produce 42.1 moles of water vapor?
a) Mole ratios:
4 mol H₂(g) : 2 mol H₂O(g)b) Proportion:
4 mol H₂ / 2 mol H₂O = x / 42.1 mol H₂O⇒ x = 42.1 × 4 / 2 moles CH₄ = 84.2 mol H₂ (g) ← answer
The decomposition of N2O5 can be described by the equation.2N2O5 (soln) ---> 4NO2 (soln) + 2 (g)Given this data for the reaction at 45 degrees C in carbon tetrachloride solution, calculate the average rate for each successive time interval.t(s) [N2O5] (M)0 2.10195 1.86556 1.48825 1.25Interval: 0 s to 195 sReaction rate= _____M/s195 s to 556 sReaction rate= _____M/s556 s to 825 sReaction rate= _____M/s
Answer:
Rate 1 => 1.2E-3 M/s, Rate 2 => 1.05E-3 M/s, Rate 3 => 8.9E-4 M/s
Explanation:
Rate = Δ[N₂O₅]/Δtime
Rate 1 = (1.86556 - 2310195)M/(195 - 0)s = -1.2 x 10⁻³ M/s
Same for Rates 2 & 3.
The rate of reaction can be calculated in terms of the consumption of the reactants in the reaction.
In the given equation [tex]\rm N_2O_5[/tex] has been the reactant that has been used 2 moles.
The rate of the reaction has been = [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{dN_2O_5}{dt}[/tex]
The reaction rate for time interval 0s - 195 sec, can be given by:Reaction rate = [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{1.86556\;-\;2.10195}{195\;s\;-\;0\;s}[/tex]
= [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{-0.23639}{195\;s}[/tex]
= 0.0006 M/s.
The rate of reaction for time interval 195s - 556s, can be given by:Reaction rate = [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{1.48825\;-\;1.86556}{556\;s\;-\;195\;s}[/tex]
= [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{-0.416735}{361\;s}[/tex]
= 0.0005 M/s
The rate of reaction for time interval 556s - 825s, can be given by:= [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{1.25\;-\;1.48825}{825\;s\;-\;556\;s}[/tex]
= [tex]\rm -\dfrac{1}{2}\;\times\;\dfrac{-0.23825}{269\;s}[/tex]
= 0.0004 M/s.
For more information about the rate of reaction, refer to the link:
https://brainly.com/question/8592296
Question 7(Multiple Choice Worth 4 points)
(08.05 MC)
What is the pH of a solution with a 3.8 × 10−4 M hydronium ion concentration?
3.4
3.8
11
12
Answer:
The pH of this solution is 3.4.
Explanation:
Consider the definition of the pH of a solution:
[tex]\displaystyle \rm pH = \log{\frac{1}{[H_{3}O^{+}]}} = - \log{[H_3O}^{+}]}[/tex],
where
[tex]\rm [H_3O}^{+}][/tex] is the hydronium ion concentration of the solution in moles per liter. Note that some textbooks write [tex]\rm [H_3O}^{+}][/tex] as [tex]\rm H^{+}[/tex].The unit "M" here is the same as moles per liter.
On a scientific calculator, evaluate
[tex]\rm -\log{(3.8\times 10^{-4})}[/tex]
to find the pH of this solution.
[tex]\rm pH = -\log{(3.8\times 10^{-4})} \approx 3.4[/tex].
The pH of this solution is approximately 3.4.
Which element would form an ionic bond with Oxygen?
Nitrogen
Lithium
Helium
Carbon
Answer:
Lithium
Explanation:
An ionic bond requires one metal and one nonmetal. Out of all the choices given, Lithium is the only one that is a metal.
Balance the following equation; then determine how many grams of CO2 will be produced when 40.0 mol of CO reacts with Fe2O3.
___Fe2O3(s) + ___CO(g) —> ___Fe(l) + ___CO2(g)
To balance the equation Fe2O3 + 3CO → 2Fe + 3CO2, we need to ensure that the number and type of atoms are the same on both sides. Using the balanced equation, we can determine that when 40.0 mol of CO reacts with Fe2O3, 1,760 g of CO2 will be produced.
Explanation:To balance the equation Fe2O3 + 3CO → 2Fe + 3CO2, we need to ensure that the number and type of atoms are the same on both sides.
Fe2O3 + 3CO → 2Fe + 3CO2
Now, to determine how many grams of CO2 will be produced when 40.0 mol of CO reacts with Fe2O3, we use the balanced equation to set up a conversion factor. The stoichiometric ratio for CO2 to CO is 3:3. So, for every 3 moles of CO, 3 moles of CO2 are produced.
Therefore, using the conversion factor:
40.0 mol CO × (3 mol CO2/3 mol CO) = 40.0 mol CO2
Converting moles to grams, we can use the molar mass of CO2:
40.0 mol CO2 × (44.01 g CO2/1 mol CO2) = 1,760 g CO2
Determine the Balmer formula n and m values for the wavelength 656.5 nm. Possible Choices: m= 1 n= 2 m= 2 n= 3 m= 3 n= 4 m= 2 n= 5 Part B Determine the Balmer formula n and m values for the wavelength 486.3 nm. Possible Choices: m= 1 n=2 m= 2 n=3 m= 1 n=4 m= 2 n=4 Part C Determine the Balmer formula n and m values for the wavelength 434.2 nm. Possible Choices: m= 1 n= 4 m= 2 n= 4 m= 3 n= 4 m= 2 n= 5 Part D Determine the Balmer formula n and m values for the wavelength 410.3 nm. Possible Choices: m= 2 n= 4 m= 2 n= 5 m= 3 n= 4 m= 2 n= 6
Answer:
[tex]\boxed{\text{A. } m = 2, n = 3; \text{B. } m = 2, n = 4; \text{C. } m = 2, n = 5; \text{D. } m = 2, n = 6}[/tex]
Explanation:
The Balmer equation is
[tex]\lambda = B\left(\dfrac{n^{2}}{n^{2} -m^{2}}\right)[/tex]
where B = 364.5 nm and m = 2
Thus, the Balmer equation reduces to
[tex]\lambda = 364.5\left(\dfrac{n^{2}}{n^{2} - 4}\right)[/tex]
We will be doing four separate calculations for n, so it will be convenient to solve the equation for n.
[tex]\lambda (n^{2} -4) = 364.5n^{2}\\\\\lambda n^{2} -4\lambda = 364.5n^{2}\\\\\lambda n^{2}- 364.5n^{2} = 4\lambda \\\\ n^{2}(\lambda - 364.5) = 4\lambda \\\\ n^{2}= \dfrac{4\lambda}{\lambda - 364.5}\\\\ n= \sqrt{\dfrac{4\lambda}{\lambda - 364.5}}[/tex]
A. λ = 656.5 nm
[tex]n= \sqrt{\dfrac{4 \times 656.5}{656.5 - 364.5}} = \sqrt{\dfrac{2626}{292}} =\sqrt{8.993} = 2.999 \approx \boxed{\mathbf{3}}[/tex]
B. λ = 486.3 nm
[tex]n= \sqrt{\dfrac{4 \times 486.3}{486.3 - 364.5}} = \sqrt{\dfrac{1945}{121.8}} =\sqrt{15.97} = 3.996 \approx \boxed{\mathbf{4}}[/tex]
C. λ = 434.2 nm
[tex]n= \sqrt{\dfrac{4 \times 434.2}{434.2 - 364.5}} = \sqrt{\dfrac{1737}{69.7}} =\sqrt{24.9} = 4.99 \approx \boxed{\mathbf{5}}[/tex]
D. λ = 410.3 nm
[tex]n= \sqrt{\dfrac{4 \times 410.3}{410.3 - 364.5}} = \sqrt{\dfrac{1641}{45.8}} =\sqrt{35.8} = 5.99 \approx \boxed{\mathbf{6}}[/tex]