Answer:
2 Mixtures are homogeneous while compounds are heterogeneous.
Explanation:
Mixtures are often described in chemistry as impure substances. They have the following properties:
Their composition is indefinite and they contain two or more elements or compounds in any proportion by mass. The constituent of mixtures can be seperated into their components. They retain their identities i.e physical properties. Mixtures are heterogenous and can also be homogeneous. Homogeneous mixtures have their components in just a single phase. Heterogenous mixtures have their components in more than just a single phase.multiple choices
Select all the correct answers.
What are some applications of fission reactions?
A)as a zero-waste energy source
B) for generating large amounts of heat
C) for creating stable elements from unstable ones
D) for creating new, heavier elements
E)as the energy source in nuclear weapons
Answer:
B, C, & E
Explanation:
Fission reaction involves the splitting of heavy unstable atoms into stable lighter atoms, with the release of energy. Fission energy is advantageous in that it produces a huge amount of energy per mass compared to other energy sources (hence also used to make nuclear bombs). However, fission produces radioactive waste particles, such as beta and alpha particles, that have high ionizing energy and can be harmful to living things.
Answer:
B and E
Explanation:
The only bonds in a formula unit of CaF2 are __________. nonpolar covalent polar covalent ionic metallic
Answer:
ionic
Explanation:
Ionic bonds exist between Ca and F ions in CaF₂. Ionic bonds are interatomic bonds formed by the transfer of electrons from one atom to the other.
The donor atom here is Ca and it has two valence electrons. Fluorine is the receiving atom with 7 electrons in its outermost shell.
Ca would give one each of its two outermost electrons to the fluorine atoms to complete their octet. Ca ion would now resemble Argon and the flourine atoms would look more like Neon atoms.
This is an ionic bond
A rock can be broken down into different kinds of substances by physical processes. No chemical reactions are needed to separate different parts of a rock into pure substances. This is because a rock is a(n)
Answer:
Mixture
Explanation:
- Can be separated by physical means
- Does not have fixed ratios between components
Edu 2020
Which of the following equations represents Photosynthesis? 16CO2 + 6H2O -----> C6H12O6 + 6O22C6H12O6 + 6O2 -----> CO2 + 6H2O3CO2 + H2O -----> C6H12O6 + 6O246O2 + 6H2O -----> C6H12O6 + 6CO2
Answer:
6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂Explanation:
Photosynthesis is the chemical process carried out by plants for the conversion of inorganic matter (carbon dioxide and water) into organic matter (glucose) with the release of oxygen, using light (sun energy).
So the chemical process may be represented by:
Word equation:
carbon dioxide + water + sun energy → glucose + oxygen
Skeleton equation:CO₂ + H₂O + sun energy → C₆H₁₂O₆ + O₂
Balanced chemical equation:6CO₂ + 6H₂O + sun energy → C₆H₁₂O₆ + 6O₂
Supressing the energy to show only the chemical compounds:6CO₂ + 6H₂O → C₆H₁₂O₆ + 6O₂
Photosynthesis is represented by the equation 6CO₂ + 6H₂O --> C6H12O6 + 6O₂. This complex process involves multiple stages and intermediate reactions that collectively result in the production of glucose and oxygen from carbon dioxide and water.
Explanation:The equation representing photosynthesis is 6CO₂ + 6H₂O --> C6H12O6 + 6O₂. This shows how carbon dioxide and water, in the presence of sunlight, are transformed into glucose (a type of sugar) and oxygen. This process, however, is quite complex and occurs in multiple stages, involving intermediate reactions and products.
There are two major phases in photosynthesis. The first is the light-dependent reactions which happen only in the presence of sunlight. The second phase is the light-independent reactions, also known as the Calvin Cycle. The overall equation for photosynthesis is a representation of a redox reaction, where carbon dioxide is reduced and water is oxidized, producing glucose and oxygen.
Though this equation may look simple, photosynthesis actually involves a series of complex biochemical reactions. In conclusion, the correct representation amongst the given options is 6CO₂ + 6H₂O --> C6H12O6 + 6O₂ .
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4 what is the net amount of heat released when two moles of c2h6(g) are formed from its elements at 101.3 kpa and 298 k?
I know the final answer is -168 bc somehow you get -84 from somewhere i'm just not sure where that comes from.
Answer:
because reference table I shows that delta h for one mole of c2h6(g) is 84.0 kj so for 2 moles of c2h6(g) is 168.0kj
168 kJ/mol is the net amount of heat released when two moles of C₂H₆ are formed from its elements at 101.3 kpa and 298 K.
What is Enthalpy of formation ?The standard reaction enthalpy for formation of the compound from the atoms or molecules at stable states that is temperature 298 K and Pressure 1 bar is called as enthalpy of formation.
What is the enthalpy of ethane ?1 Atm (Atmospheric pressure) = 101.3 KPa (Kilopascal)
At 1 atm and 298 K the enthalpy of formation of ethane is -84 kJ/mol.
The enthalpy of formation of 1 mole of C₂H₆ is 84 kJ/mol because heat is released here so enthalpy of formation is positive.
Therefore, the enthalpy of formation of 2 mole of C₂H₆ = 2 × 84 kJ/mol
= 168 kJ/mol
Thus from the above conclusion we can say that 168 kJ/mol is the net amount of heat released when two moles of C₂H₆ are formed from its elements at 101.3 kpa and 298 K.
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Which of the following is true for the actual yield of a reaction?
It is always calculated as a ratio.
It is the yield from the excess reactant.
It is the yield from the limiting reactant.
It is always less than the theoretical yield.
Answer:
It is always less than the theoretical yield
Explanation:
For many chemical reactions, the actual yield is usually less than the theoretical yield. This is due to possible loss in the process or inefficiency of the chemical reaction.
Answer:
It is always less than the theoretical yield.
Explanation:
Theoretical yield is obtained from stoichiometry calculation of a balanced equation. Actual yield is the amount of product formed from a reaction. Percentage yield is the ratio of actual yield to the theoretical yield of a product. Percentage yield is never 100 % or greater than 100%. Therefore, Actual yield of a product always less than the theoretical yield.
Which of the following solutions will have the lowest freezing point?A) 0.015 m MgCl2 B) 0.0100 m NaCl C) 0.035 m CH3CH2CH2OH D) 0.0100 m Li2SO4
The solution with the lowest freezing point would likely be the 0.015 m MgCl2 solution. This is due to the principle of freezing point depression, where a solution with more solute particles will generally have a lower freezing point than a solution with fewer solute particles.
Explanation:The question asks which of the given solutions will have the lowest freezing point. This is a question related to chemistry, specifically colligative properties, one of which is freezing point depression.
In a process known as freezing point depression, solutions typically freeze at lower temperatures than pure liquids. This is because the presence of solute particles disrupts the ability of the solvent to form a regular pattern in the solid state, thus requiring a lower temperature to freeze.
To determine which solution has the lowest freezing point, we must consider both the molality of the solution and the number of solute particles produced by each formula unit of solute. Those that yield more particles upon dissociation have a greater effect on freezing point depression. In this case, 0.015 m MgCl2 should have the lowest freezing point as MgCl2 dissociates into three ions (Mg2+ and two Cl- ions), thus producing more solute particles per formula unit compared to the other given solutions.
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The solution with the lowest freezing point is A) 0.015 m MgCl₂, because it results in the highest effective particle concentration due to its dissociation into three ions in solution.
To determine this, we need to use the concept that the freezing point decreases as the concentration of dissolved particles increases. This is calculated using the van 't Hoff factor (i), which indicates the number of particles a compound dissociates into in solution.
MgCl₂ dissociates into 3 ions (1 Mg²⁺ and 2 Cl⁻), so its van 't Hoff factor is 3.
NaCl dissociates into 2 ions (1 Na⁺ and 1 Cl⁻), so its van 't Hoff factor is 2.
CH₃CH₂CH₂OH (propanol) does not dissociate in solution, so its van 't Hoff factor is 1.
Li₂SO₄ dissociates into 3 ions (2 Li⁺ and 1 SO₄²⁻), so its van 't Hoff factor is 3.
We then multiply the molality by the van 't Hoff factor to find the effective particle concentration for each solution:
A) 0.015 m MgCl₂: 0.015 m x 3 = 0.045 m
B) 0.0100 m NaCl: 0.0100 m x 2 = 0.020 m
C) 0.035 m CH₃CH₂CH₂OH: 0.035 m x 1 = 0.035 m
D) 0.0100 m Li₂SO₄: 0.0100 m x 3 = 0.030 m
The lowest freezing point corresponds to the highest effective particle concentration. Therefore, Solution A) 0.015 m MgCl2 has the lowest freezing point.
A solid that forms and separates from a liquid mixture is called ------
Answer:
Chemical change
Explanation:
A solid that forms and separates from a liquid mixture is called Chemical change.
Please mark brainliest and have a great day!
What type of defense mechanisms does our body have to fight off affections?
Answer:
The immune system uses white blood cells and antibodies to identify and eliminate organisms that get through the body's natural barriers.
Explanation:
When the immune system is weakened by the virus, the body is especially susceptible to infections by what are usually harmless pathogens because of the reduction of a specific group of T cells. Due to the lack of T cells, the immune system has difficulties properly coordinating the fight against the pathogens in the tissue. This is when white blood cells and antibodies begin their attack. Then the immune system can fight against the infection on all fronts.
White Blood Cell- a colorless cell that circulates in the blood and body fluids and is involved in counteracting foreign substances and disease; a white (blood) cell. There are several types, all amoebic cells with a nucleus, including lymphocytes, granulates, monocles, and macrophages.
Antibodies- a blood protein produced in response to and counteracting a specific antigen. Antibodies combine chemically with substances which the body recognizes as alien, such as bacteria, viruses, and foreign substances in the blood.
The reaction below shows a system in equilibrium.
How would a decrease in temperature affect this reaction?
A. The rate of formation of the gases would increase.
B. The equilibrium of the reaction would shift to the left.
C. The equilibrium would shift to cause the gases to sublime into solids.
D. The chemicals on the left would quickly form the chemical on the right.
The given question is incomplete, here is a complete question.
The reaction below shows a system in equilibrium.
[tex]H_2(g)+I_2(g)+Heat\rightarrow 2HI(g)[/tex]
How would a decrease in temperature affect this reaction?
A. The rate of formation of the gases would increase.
B. The equilibrium of the reaction would shift to the left.
C. The equilibrium would shift to cause the gases to sublime into solids.
D. The chemicals on the left would quickly form the chemical on the right.
Answer : The correct option is, (B) The equilibrium of the reaction would shift to the left.
Explanation :
The given reaction is endothermic reaction.
For an endothermic reaction, heat is getting absorbed during a chemical reaction and is written on the reactant side.
Any change in the equilibrium is studied on the basis of Le-Chatelier's principle. This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.
As, heat is getting absorbed during a chemical reaction. This means that temperature is getting increased on the reactant side.
If the temperature in the equilibrium is decreased, the equilibrium will shift in the direction where, temperature is getting increased. Thus, the reaction will shift in left direction that is towards the reactants.
Hence, the correct option is, (B) The equilibrium of the reaction would shift to the left.
Please help on this one?
Answer:
[tex]\text{C. } _{36}^{85}\text{Kr}[/tex]
Explanation:
Your nuclear equation is
[tex]_{35}^{85}\text{Br} \longrightarrow \, _{-1}^{0}\text{e} +\, _{x}^{y}\text{X}[/tex]
The main point to remember in balancing nuclear equations is that
the sum of the superscripts and must be the same on each side of the equation.the sum of the subscripts must be the same on each side of the equation.Then
85 = 0 + y, so y = 85 - 0 = 0
35 = -1 + x, so x = 35 + 1 = 36
The nucleus with atomic number 36 and atomic mass 85 is krypton-85.
The nuclear equation becomes
[tex]_{35}^{85}\text{Br} \longrightarrow \, _{-1}^{0}\text{e} + \, _{36}^{85}\text{Kr}[/tex]
Answer:
C
Explanation:
More _____ is required to halogenate alkanes than to halogenate alkenes. activation energy ionization energy electronegativity nuclear energy
Answer:
activation energy
Explanation:
Answer:
Activation Energy
Explanation:
Energy of Activation is the energy which must be provided to a chemical or nuclear system with potential reactants to result in: a chemical reaction.
More activation energy is required because it would take more energy to add elements across single bonds than it would take for double bonds.
ionization energy or ionisation energy, denoted Eᵢ, is the minimum amount of energy required to remove the most loosely bound electron, the valence electron, of an isolated neutral gaseous atom or molecule. This option is incorrect.
Electronegativity, symbol χ, is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself. This option is incorrect.
NUclear energy is the energy released during nuclear fission or fusion, especially when used to generate electricity. This option is incorrect.
A jar is tightly sealed at 22°C and 772 torr what is the pressure inside a jar after its been heated to 178°C
Answer:
P1/T1 = P2/T2
772torr / 295K = P2 / 451K
P2 = 1180.2torr
Explanation:
The pressure inside a jar after it's been heated to 178°C is 1180.2 torr.
What is an ideal gas equation?The ideal gas equation, pV = nRT, is an equation used to calculate either the pressure, volume, temperature or number of moles of a gas.
Given data:
[tex]P_1[/tex]=772torr
[tex]T_1[/tex]=295K
[tex]P_2[/tex]=?
[tex]T_2[/tex]=451K
Applying formula:
[tex]\frac{P_1}{T_1} = \frac{P_2}{T_2}[/tex]
[tex]\frac{772torr}{295K} =\frac{P_2}{ 451K}[/tex]
P2 = 1180.2torr
Hence, the pressure inside a jar after it's been heated to 178°C is 1180.2 torr.
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2) All forms of radioisotopes:
a) are radioactive, dangerous and should be banned
b) emit radiation
c) can be used medically, agriculturally and/or for electrical power
d) cause immediate health problems
Answer:
It will Cause IMMEDIATE health problems
Explanation:
How long do balloons stay inflated with helium
Answer:
Balloons last between 12-21 hours filled with helium
Explanation:
latex balloons generally last between 12-20 hours filled with helium, and about 2-3 days when treated with Hi-Float
Balloons filled with helium deflate faster than balloons filled with heavier gases due to the effusion rate of helium.
Balloons filled with helium will stay inflated for a shorter time compared to balloons filled with heavier gases like air due to the greater effusion rate of helium.
Helium-filled balloons lose their buoyancy quicker because helium effuses much more rapidly through the microscopic pores in the rubber balloon.
In an endothermic reaction, a drop in temperature would be observed.
TRUE
or
FALSE
The process n01 → p11 + β−10 n 0 1 → p 1 1 + β - 1 0 represents a(n) _____.
alpha decay
beta decay
electron capture
fusion
Answer:
beta decayExplanation:
The process is represented by the nuclear equation:
[tex]^1_0n[/tex] → [tex]^1_1p+^0_{-1}\beta[/tex]Where:
n represents a neutron,p represents a proton, andβ represents an electron.The superscripts to the leff of each symbol is the mass number (number of protons and neutrons), and the subscript to the left means the atomic number (number of protons).
Then, in this process a neutron is being transformed into a proton by the emssion of an electron (from inside the nucleus of the atom).
This electron is named beta (β) particle, and the process is called beta decay, because the neutron is changing into other subatomic particles.
what is the ph of 0.001 m NaOH
Answer:
11.
Explanation:
For 0.001 M NaOH:[OH⁻] = 0.001 M.
∵ pOH = - log[OH⁻]
∴ pOH = - log(0.001 M) = 3.
∵ pH + pOH = 14.
∴ pH = 14 - pOH = 14 - 3 = 11.
The pH of a 0.001 M NaOH solution is 11.00, as NaOH is a strong base that completely dissociates in water to give a hydroxide ion concentration equal to its molarity, and the pH is calculated from the hydrogen ion concentration derived from the dissociation constant of water.
The question is asking for the pH of a 0.001 M solution of NaOH, which is a strong base. In a strong base like NaOH, it dissociates completely in water, which means that the concentration of the hydroxide ions, [OH⁻], will also be 0.001 M. To find the concentration of hydrogen ions, [H+], we use the formula [H+] = 10⁻¹⁴ / [OH⁻].
Therefore, [H⁺] = 10⁻¹⁴ / 0.001 M = 1.0 x 10⁻¹¹ M. The pH is then calculated using the formula pH = -log[H+], which gives us pH = -log(1.0 x 10⁻¹¹) = 11.00.
Determine the identity of the daughter nuclide from the electron capture by 3517cl. determine the identity of the daughter nuclide from the electron capture by . 4019k 3218ar 3516s 3215p 3718ar
Answer:
[tex]^{35}_{16}S[/tex]Explanation:
When the nucleus of an atom captures and electron, such electron combines with a proton and forms a neutron. Thus, the mass number remains the same (just a proton has been converted into a neutron) but the atomic number (the number of protons) decrease in one.
Then, the daughter nuclide will have the same mass number and the atomic number reduced in one.
The given parent isotope is [tex]^{35}_{17}Cl[/tex], which means that it has these features:
Chemical symbol: Cl Name of the element: chlorine Mass number (the superscript to the left): 35 Atomic number (the subscript to the left): 17And the daughter nuclide after the electron capture will be:
Mass number: 35 (the same of the parent nuclide)Atomic number: 17 - 1 = 16Identity: sulfur (search the element with atomic number 16 in a periodic table).Chemical symbol: SIdenity of the daughter nuclide using the isotope notation:[tex]^{35}_{16}S[/tex]
Hence, the answer is the third choice.
Final answer:
The daughter nuclide from electron capture by 35Cl is 35S
Explanation:
When an atom undergoes electron capture, an electron from an inner shell combines with a proton in the nucleus, resulting in the conversion of a proton to a neutron.
For the given question, electron capture by 3517Cl results in the formation of a daughter nuclide with an atomic number one less than that of chlorine (16) and the same mass number.
Therefore, the daughter nuclide after electron capture by 3517Cl is 3516S.
An unknown substance has been shown to have metallic bonds.
Which of the following is most likely a property of this substance?
A. low conductivity
B. low boiling point
C. high malleability
D. high solubility in water
Answer:
C.) High malleability.
Explanation:
There is a strong force between the metal ions and free floating electrons, meaning a substance with a metallic bond may be shaped and molded without breaking/fracturing due to their strength.
As the unknown substance is metal it has a characteristic property of metals which is high malleability.
What are the characteristics of metals?
An element is the simplest form of matter.Elements are further classified as metal,non -metals and metalloids. Metals possess luster and are malleable that is they can be drawn into thin sheets.They are also ductile and can be drawn into thin wires and are hard due to the strong ionic bonding present in them.
They are good conductors of heat and electricity due to the presence of mobile electrons .They have high density because of the compact arrangement of atoms .As a result of the arrangement of atoms,they have high melting points.
Malleability and ductility of metals is due to the presence of layers of atoms which can slide over each other on application of force.
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Which terms could have a greatest common factor of 5m2n2? Check all that apply.m5n55m4n310m4n15m2n224m3n4
Answer:
The second and the third terms from the choices:
5m⁴n³, and10m⁴n¹⁵Explanation:
The greatest common factor of a set of numbers is found by:
1) Write each number as a product of prime factors, each factor raised to the corresponding exponent (power);
2) Choose only the common prime factors, with the least exponent.
Example: find the greatest common factor of 35x²y³ and 15xy²
Prime factorization: 35x²y³ = 5¹ . 7¹ . x² . y³15xy² = 3¹ . 5¹ . x¹ . y²
Common factors (each raised to its least exponent): 5¹, x¹, and y²Greatest common factor (make the product): 5 . x . y² = 5xy²Now apply the process to the given terms:
m⁵n⁵ : these are prime factors5m⁴n³: these are prime factors10m⁴n¹⁵: prime factors = 2 . 5 . m⁴ n¹⁵.
m²n²: these are prime factors24m³n⁴: prime factors = 2³ . 3 . m³ n⁴The terms that could have a greatest common factor of 5m²n², are those that include 5m²n², and those are:
5m⁴n³, and2 . 5 . m⁴ n¹⁵ = 10m⁴n¹⁵These are the second and the third terms from the choices.
Answer:
5m⁴n³, and
10m⁴n¹⁵
Explanation:
A 100.0 mL sample of 0.300 M NaOH is mixed with a 100.0 mL sample of 0.300 M HNO3 in a coffee cup calorimeter. If both solutions were initially at 35.00°C and the temperature of the resulting solution was recorded as 37.00°C, determine the ΔH°rxn (in units of kJ/mol NaOH) for the neutralization reaction between aqueous NaOH and HCl. Assume 1) that no heat is lost to the calorimeter or the surroundings, and 2) that the density and the heat capacity of the resulting solution are the same as water. - 34.4 kJ/mol NaOH -169 kJ/mol NaOH -55.7 kJ/mol NaOH -27.9 kJ/mol NaOH -16.7 kJ/mol NaOH
Answer:
[tex]\boxed{\text{-55.8 kJ/mol NaOH}}[/tex]
Explanation:
NaOH + HNO₃ ⟶ NaNO₃ + H₂O
There are two energy flows in this reaction.
[tex]\begin{array}{cccl}\text{Heat from neutralization} & + &\text{Heat absorbed by water} & = 0\\q_{1} & + & q_{2} & =0\\n\DeltaH & + & mC\Delta T & =0\\\end{array}[/tex]
Data:
V(base) = 100.0 mL; c(base) = 0.300 mol·L⁻¹
V(acid) = 100.0 mL; c (acid) = 0.300 mol·L⁻¹
T₁ = 35.00 °C; T₂ = 37.00 °C
Calculations:
(a) q₁
[tex]n_{\text{NaOH}} = \text{0.1000 L } \times \dfrac{\text{0.300 mol}}{\text{1 L}} = \text{0.0300 mol}\\\\n_{\text{HNO}_{3}} = \text{0.1000 L } \times \dfrac{\text{0.300 mol}}{\text{1 L}} = \text{0.0300 mol}[/tex]
We have equimolar amounts of NaOH and HNO₃
n = 0.0300 mol
q₁ = 0.0300ΔH
(b) q₂
V = 100.0 mL + 100.0 mL = 200.0 mL
m = 200.0 g
ΔT = T₂ - T₁ = 37.00 °C – 35.00 °C = 2.00 °C
q₂ = 200.0 × 4.184 × 2.00 = 1674 J
(c) ΔH
0.0300ΔH + 1674 = 0
0.0300ΔH = -1674
ΔH = -1674/0.0300
ΔH = -55 800 J/mol
ΔH = -55.8 kJ/mol
[tex]\Delta_{r}H^{\circ} = \boxed{\textbf{-55.8 kJ/mol NaOH}}[/tex]
The neutralization of NaOH and HNO3 is exothermic, releasing heat which raises the temperature of the solution. The heat of the reaction can be calculated by considering the total mass of the solution and the rise in temperature, and should be divided by the moles of NaOH used to give the enthalpy change in kJ/mol.
Explanation:When aqueous NaOH is mixed with HNO3 in a coffee cup calorimeter, a neutralization reaction occurs. The equation for this reaction is NaOH (aq) + HNO3(aq) → NaNO3(aq) + H2O(l). Since it is a strongly exothermic reaction, heat is released causing the rise in observed temperature. To determine the ΔH°rxn, calculate the heat change using the equation q = ms ΔT, where m is the total mass of the solution, s is the specific heat capacity of water (4.18 J/g°C), and ΔT is the change in temperature. Convert this energy to kj, and because no heat is lost to the surroundings, the heat absorbed by the solution is the same as the heat released by the reaction. This heat of reaction is then divided by the amount of NaOH used in the reaction to give the enthalpy change in kJ/mol NaOH, which can be used to pick one of the possible answers provided.
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Using the spectra data below, which structure best matches this data? c4h8o 1h nmr triplet at 1.05 ppm (3h) singlet at 2.13 ppm (3h) quartet at 2.47 ppm (2h) ir spectrum: there is a strong peak near 1700 cm-1.
The spectral data for C4H8O with 1H NMR and IR spectra is indicative of an aldehyde or ketone functional group, but the exact structure requires additional information.
Explanation:The given spectral data for C4H8O includes: 1H NMR showing a triplet at 1.05 ppm (3H), a singlet at 2.13 ppm (3H), and a quartet at 2.47 ppm (2H). The IR spectrum shows a strong peak near 1700 cm-1.
The 1H NMR data indicates the presence of a methyl group (triplet at 1.05 ppm), a possible methyl or methoxy group (singlet at 2.13 ppm), and a methylene group (quartet at 2.47 ppm). The strong IR band near 1700 cm-1 suggests the presence of a carbonyl group. Considering the molecular formula C4H8O, these data best correspond to the presence of an aldehyde or a ketone. However, the specific structure cannot be precisely determined without more information. The presence of the carbonyl functional group is indicated by the IR data, and the NMR data give clues about the types of hydrogen environments present in the molecule.
Potassium iodide will have which molecular configuration?
Select one:
a. bent
b. linear
c. tetrahedral
d. triangular
Answer:
None of the above.
Explanation:
KI is not a molecular substance.
It is an ionic solid with the same crystal structure as NaCl.
The shapes given in the options are for molecules and three-dimensional ions.
C3H8O3 - glycerol Major species present when dissolved in water
Answer:
[tex]\rm C_{3}H_{8}O_{3}(aq)[/tex]
Explanation:
Glycerol is a covalent molecule. The major species in an aqueous solution will be hydrated glycerol molecules.
[tex]\rm C_{3}H_{8}O_{3}(l) \longrightarrow \, C_{3}H_{8}O_{3}(aq)[/tex]
The major species present when glycerol is dissolved in water are glycerol molecules (C₃H₈O₃), hydronium ions (H₃O+) and hydroxide ions (OH⁻).
What are the species present in C₃H₈O₃?When glycerol (C₃H₈O₃) is dissolved in water, it undergoes complete ionization.
Glycerol is a polyol compound that is soluble in water, and it forms hydrogen bonds with water molecules.
The major species present when glycerol is dissolved in water are:
Glycerol molecules (C₃H₈O₃)Hydronium ions (H₃O+)Hydroxide ions (OH⁻)The overall equation for the ionization of glycerol in water can be represented as:
C₃H₈O₃ + H₂O ⇌ C₃H₇O₃⁻ + H₃O⁺
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The number at the end of an isotope’s name is the ____ number. A) Atomic B)neutron C)mass D)electron
Answer:
The number at the end of an isotope's name is the (C.) mass number.
PLEASE HELP!!
A 100 gram sample is left undisturbed for 8 hours. At the end of that period, only 12.5 grams remain. What is the half-life of this sample?
Answer:
8/3 hours
Explanation:
12.5/100=1/8, 1/8*2=2/8=1/4 1/4*2=1/2 1/2*2 = 1 (whole)
we multiplyed 1/8 by two three times to get 1 so 8/3 hours is the answer
by the way i'm in 6th grade
if 58.67g of mercuric oxide were completely decomposed to generate 54.34 g of mercury how many grams of oxygen should have been produced
Answer:
4.33g
Explanation:
The reaction equation is given as:
2HgO → 2Hg + O₂
Given parameters:
Mass of HgO = 58.67g
Mass of Hg produced = 54.34g
Unknown:
Mass of oxygen produced = ?
Solution
From the reaction equation, using the mole concept, it is possible to determine the mass of oxygen gas produced.
To do this, we first determine the molar composition of the mass of the given mercury oxide. Then we use the balanced reaction equation to determine the mass of oxygen produced:
Number of moles of HgO = [tex]\frac{mass of HgO}{Molar mass of HgO}[/tex]
Molar mass of HgO = 200.6 + 16 = 216.6gmol⁻¹
Number of moles of HgO = [tex]\frac{58.67}{216.6}[/tex] = 0.271mol
From the reaction equation, we know that:
2moles of HgO produced 1 mole of O₂
0.271moles of HgO would also produce, 0.136mol
Therefore, mass of O₂ gas produced = number of moles of O₂ x molar mass
Molar mass of O₂ = 16x2 = 32gmol⁻¹
Mass of O₂ gas = 0.136 x 32 = 4.33g
Vinegar is an aqueous solution of acetic acid (HCH3COO). When vinegar reacts with dry baking soda (NaHCO3), the result is an aqueous solution of sodium acetate (NaCH3COO), liquid water, and carbon-dioxide gas, which bubbles out of the solution. Which chemical equation correctly represents this reaction?
Answer:
its a
Explanation:
The chemical equation that represents the reaction between vinegar (acetic acid) and baking soda (sodium bicarbonate) is:
[tex]\rm CH_3COOH(aq) + NaHCO_3(s) \rightarrow NaCH_3COO(aq) + H_2O(l) + CO_2(g)[/tex]
A chemical equation is a symbolic representation of a chemical reaction in the form of reactants and products.
The balanced equation for the reaction between vinegar and baking soda is represented as:
[tex]\rm CH_3COOH(aq) + NaHCO_3(s) \rightarrow NaCH_3COO(aq) + H_2O(l) + CO_2(g)[/tex]
This equation shows that acetic acid ([tex]\rm CH_3COOH[/tex]) reacts with sodium bicarbonate ([tex]\rm NaHCO_3[/tex]) to produce sodium acetate ([tex]\rm NaCH_3COO[/tex]), liquid water ([tex]\rm H_2O[/tex]), and carbon dioxide gas ([tex]\rm CO_2[/tex]).
Therefore, the above equation represents the complete balanced chemical equation for the reaction between vinegar (acetic acid) and baking soda (sodium bicarbonate).
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Which is the electron configuration for bromine? 1s22s22p63s23p64s23d104p5 1s22s22p63s23p64s23d104p6 1s22s22p63s23p44s23d104p5 1s22s22p63s23p64s23d94p5
Answer : The correct option is, [tex]1s^22s^22p^63s^23p^64s^23d^{10}4p^5[/tex]
Explanation :
The given element bromine belongs to the group 17 and period 4. The symbol of bromine is, Br.
The atomic number of bromine = 35
The total number of electrons present in bromine element = 35
Electronic configuration : It is defined as the arrangement of electrons around the nucleus of an atom.
Hence, the correct electronic configuration of bromine is,
[tex]1s^22s^22p^63s^23p^64s^23d^{10}4p^5[/tex]
I believe the correct answer choice is A