Answers2026-2027_MDCPS_2003345_Chemistry_1_B-CROxidation-Reduction

Oxidation-Reduction — Cumulative exam Answers

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A sample of propane (C3H8) has a mass of 0.47 g. The sample is burned in a bomb calorimeter that has a mass of 1.350 kg and a specific heat of 5.82 J/(g • °C). How much energy is released by the reaction if the temperature of the calorimeter rises by 2.87°C?Use .

Question illustration
A
7.85 kJ
B
10.6 kJ
C
22.5 kJ
D
47.9 kJ
2
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Pure water at 25°C

A
ionizes in the presence of acid to form an equilibrium in which
Option A
B
ionizes in the presence of acid to form an equilibrium in which
Option B
C
self-ionizes to form an equilibrium in which
Option C
D
self-ionizes to form an equilibrium in which
Option D
3

Which of the following is an oxidation-reduction reaction?

A
SO2(g) + H2O(l) H2SO3(aq)
Option A
B
CaCO3(s) CaO(s) + CO2(g)
Option B
C
Ca(OH)2(s) + H2CO3(l) CaCO3(aq) + 2H2O(l)
Option C
D
C6H12O6(s) + 6O2(g) 6CO2(g) + 6H2O(l)
Option D
4

Which value is most likely to be the pH of a salt solution that is formed by the reaction of a strong acid and a weak base?

A
2.0
B
7.0
C
8.0
D
10.0
5

Which task most likely involves a calculation that uses moles?

A
measuring a sugar sample on a balance
B
counting the number of jellybeans in a jar
C
determining the number of atoms in a jar of liquid
D
finding the rate of expansion of a gas-filled balloon
6

An atom bonds with another atom. What is the best classification for this reaction?

A
endothermic
B
chemical
C
nuclear
D
redox
7

Water is dissolved into n-butanol (a polar liquid). Which is the second step at the molecular level as water dissolves into n-butanol?

A
n-Butanol mixes with water.
B
Water molecules are carried into n-butanol.
C
n-Butanol molecules surround water molecules.
D
n-Butanol molecules are attracted to the surface of the water molecules.
8

The following reaction occurs in a car’s catalytic converter.2NO(g) + 2CO(g) N2(g) + 2CO2(g) Which answer best describes the reducing and oxidizing processes in this reaction?

Question illustration
A
NO and CO are both reducing agents.
B
NO and CO are both oxidizing agents.
C
The oxidation state of nitrogen in NO changes from +2 to 0, and the oxidation state of carbon in CO changes from +2 to +4 as the reaction proceeds.
D
The oxidation state of nitrogen in NO changes from 0 to +2, and the oxidation state of carbon in CO changes from +4 to +2 as the reaction proceeds.
9

Which value is most likely to be the pH of a salt solution that is formed by the reaction of a weak acid and a strong base?

A
2.0
B
6.8
C
7.0
D
8.7
10

What is a common use of bases?

A
as a component of vinegar
B
as a component of car batteries
C
to make foods tart
D
to reduce indigestion
11

The expression below was formed by combining different gas laws. Which law was used to determine the relationship between the volume and the number of moles in this equation?

Question illustration
A
Boyle’s law
B
Charles’s law
C
Avogadro’s law
D
Gay-Lussac’s law
12

During photosynthesis, sunlight shining on a plant is absorbed. Through several chemical reactions, the plant produces sugar, a high-energy compound, from simpler substances. What energy transformation occurs during this process?

A
thermal energy to chemical energy
B
electromagnetic energy to chemical energy
C
kinetic energy to potential energy
D
potential energy to chemical energy
13

The enthalpy of formation of water is –285.8 kJ/mol. What can be inferred from this statement?

A
The enthalpy of the products is equal to the enthalpy of the reactants.
B
Heat is absorbed during the process.
C
Heat is released during the process.
D
The enthalpy of the products is more than the enthalpy of the reactants.
14

How does heat differ from temperature?

A
Temperature is the measure of heat.
B
Temperature and heat are the same thing.
C
Temperature measures thermal energy, and heat is the flow of thermal energy.
D
Temperature measures the loss of energy, and heat measures the gain of energy.
15

A solar panel combines multiple photovoltaic cells. Which type of energy is used to power a solar panel?

A
kinetic energy
B
thermal energy
C
electromagnetic energy
D
gravitational potential energy
16

Consider the balanced equation below.N2H4 + 2H2O2 N2 + 4H2OWhat are the mole ratios of hydrazine (N2H4) to hydrogen peroxide (H2O2) and hydrazine to water?

Question illustration
A
1:2 and 1:4
B
1:3 and 1:4
C
1:2 and 3:5
D
1:3 and 3:5
17

Why does the presence of lone pair electrons contribute to the polarity of a water molecule?

A
They allow the bonds between oxygen and hydrogen to be single.
B
They increase the partial positive charge on the oxygen atom.
C
They prevent the atoms from forming a linear molecule.
D
They counter the uneven pull on electrons between the atoms.
18

Molecules in all organisms are composed in part of radioactive carbon-14. Which statement best explains the presence of carbon-14 in organisms?

A
The radioactive isotope reacts in the same way as stable isotopes in the nuclear reactions in the body.
B
The radioactive isotope reacts in the same way as stable isotopes in the chemical reactions in the body.
C
The radioactive isotope reacts faster than stable isotopes in the nuclear reactions in the body.
D
The radioactive isotope reacts faster than stable isotopes in the chemical reactions in the body.
19

Ethyne (C2 H2 (g), Hf = 226.77 kJ/mol) undergoes complete combustion in the presence of oxygen to produce carbon dioxide (CO2 (g), Hf = –393.5 kJ/mol ) and water (H2 O(g), Hf = –241.82 kJ/mol) according to the equation below.What is the enthalpy of combustion (per mole) of C2 H2 (g)? Use .

Question illustration
A
–2511.2 kJ/mol
B
–1255.6 kJ/mol
C
–862.1 kJ/mol
D
–431.0 kJ/mol
20

A chemistry journal requires that all new research papers be peer reviewed by other scientists before they are published. This allows which of the following?

A
The reviewers can determine the experiment’s feasibility.
B
The reviewers can determine the experiment’s validity.
C
The reviewers can include their own findings with the research.
D
The reviewers can determine if they will help fund the research.

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