Chemical Reactions: Types, Balancing, Stoichiometry - Interactive Quiz

Question 1

What is the activation energy of a reaction?

Accepted Answer

The minimum energy required for a reaction to occur

Answer

The maximum energy released during a reaction

Answer

The energy difference between reactants and products

Answer

The energy required to form products

Question 2

What is the equilibrium constant of a reversible reaction?

Accepted Answer

The ratio of the concentrations of products to reactants at equilibrium

Answer

The ratio of the rate constants of the forward and reverse reactions

Answer

The difference in energy between reactants and products

Answer

The temperature at which a reaction reaches equilibrium

Question 3

Which of the following is NOT a type of chemical reaction studied in this unit?

Accepted Answer

Nuclear fusion

Answer

Combination

Answer

Decomposition

Answer

Redox

Question 4

Balance the following chemical equation: Fe + O2 -> Fe2O3

Accepted Answer

2Fe + 3O2 -> Fe2O3

Answer

4Fe + 3O2 -> 2Fe2O3

Answer

Fe + 2O2 -> Fe2O3

Answer

2Fe + O2 -> 2FeO

Question 5

Which of the following factors does NOT affect the rate of a chemical reaction?

Accepted Answer

Color of the reaction mixture

Answer

Temperature

Answer

Surface area of reactants

Answer

Concentration of reactants

Question 6

In the reaction: 2Na(s) + Cl2(g) → 2NaCl(s), what is the mole ratio of sodium to chlorine?

Accepted Answer

2 : 1

Answer

1 : 1

Answer

1 : 2

Answer

2 : 2

Question 7

Which of the following is the limiting reactant in the reaction: 2NH3(g) + 5O2(g) → 4NO(g) + 6H2O(g), when 4 moles of NH3 and 6 moles of O2 are reacted?

Accepted Answer

NH3

Answer

O2

Answer

NO

Answer

H2O

Question 8

A chemical reaction has an activation energy of 120 kJ/mol. What is the effect of increasing the temperature on the rate of the reaction?

Accepted Answer

It will increase the rate of the reaction

Answer

It will decrease the rate of the reaction

Answer

It will have no effect on the rate of the reaction

Answer

It is not possible to determine without further information

Question 9

Which of the following is a redox reaction?

Accepted Answer

Zn(s) + 2HCl(aq) → ZnCl2(aq) + H2(g)

Answer

NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

Answer

2Na(s) + 2H2(g) → 2NaH(s)

Answer

2FeCl3(aq) + 3Na2CO3(aq) → 6NaCl(aq) + Fe2(CO3)3(s)

Question 10

Which of the following is a characteristic of a buffer solution?

Accepted Answer

It resists changes in pH when small amounts of acid or base are added

Answer

It has a pH of exactly 7

Answer

It contains only strong acids and bases

Answer

It is unable to react with other acids or bases

Question 11

Which of the following is NOT a fundamental type of chemical reaction?

Accepted Answer

Transposition

Answer

Combination

Answer

Decomposition

Answer

Substitution

Question 12

In the reaction 2 mol A + 3 mol B -> AB2, which reactant is the limiting reactant?

Accepted Answer

A

Answer

B

Answer

Neither A nor B

Answer

Cannot be determined

Question 13

Which of the following factors does NOT affect the reaction rate of a chemical reaction?

Accepted Answer

Magnetic field

Answer

Temperature

Answer

Surface area

Answer

Concentration

Question 14

Which of the following is a catalyst?

Accepted Answer

MnO2

Answer

HCl

Answer

NaHCO3

Answer

CO2

Question 15

Predict the products of the following reaction: CaCO3 + 2HCl ->

Accepted Answer

CaCl2 + H2O + CO2

Answer

CaCl2 + H2 + CO2

Answer

CaCl + H2O + CO

Answer

CaCl + H2 + CO

Question 16

Which of the following is a strong acid?

Accepted Answer

Hydrochloric acid

Answer

Acetic acid

Answer

Carbonic acid

Answer

Phosphoric acid

Question 17

Which of the following statements about chemical equilibrium is accurate?

Accepted Answer

The forward and reverse reactions proceed at equal rates, resulting in no net change.

Answer

The concentrations of reactants and products remain constant indefinitely.

Answer

The equilibrium constant is always less than 1.

Answer

Chemical equilibrium is established only in open systems.

Question 18

Select the substance that acts as a catalyst in chemical reactions:

Accepted Answer

Platinum (Pt)

Answer

Sodium chloride (NaCl)

Answer

Hydrogen peroxide (H₂O₂)

Answer

Water (H₂O)

Question 19

Which of the following statements about spontaneous reactions is true?

Accepted Answer

A spontaneous reaction occurs when ΔG is negative.

Answer

A spontaneous reaction occurs when ΔG is positive.

Question 20

Which of the following is NOT a type of chemical reaction?

Accepted Answer

Neutralization

Answer

Synthesis

Answer

Decomposition

Answer

Single-displacement

Question 21

What is the type of reaction that occurs when an acid reacts with a base?

Accepted Answer

Neutralization

Answer

Combination

Answer

Decomposition

Answer

Displacement

Question 22

What is the oxidation state of carbon in 'CO2'?

Accepted Answer

-4

Answer

-2

Answer

+2

Answer

+4

Question 23

Which of the following is a redox reaction?

Accepted Answer

2Na + 2H2O → 2NaOH + H2

Answer

2HCl + Ca(OH)2 → CaCl2 + 2H2O

Answer

CH4 + 2O2 → CO2 + 2H2O

Answer

CaCO3 → CaO + CO2

Question 24

Classify the following chemical reaction: 2Na + Cl₂ → 2NaCl

Accepted Answer

Combination

Answer

Decomposition

Answer

Displacement

Answer

Transmutation

Question 25

Balance the equation: C₃H₈ + O₂ → CO₂ + H₂O

Accepted Answer

C₃H₈ + 5O₂ → 3CO₂ + 4H₂O

Answer

2C₃H₈ + 5O₂ → 6CO₂ + 4H₂O

Answer

C₃H₈ + 2O₂ → 3CO₂ + 2H₂O

Answer

2C₃H₈ + 7O₂ → 6CO₂ + 8H₂O

Question 26

Describe the role of a catalyst in a chemical reaction.

Accepted Answer

To increase the reaction rate without being consumed.

Answer

To decrease the reaction rate without being consumed.

Answer

To alter the products of the reaction.

Answer

To prevent the reaction from occurring.

Question 27

Determine the hybridization of the nitrogen atom in ammonia (NH₃).

Accepted Answer

sp³

Answer

sp

Answer

sp²

Answer

sp³d

Question 28

Which of the following is NOT a type of chemical reaction?

Accepted Answer

Diffusion

Answer

Double displacement

Answer

Decomposition

Answer

Single displacement

Question 29

In the reaction: 2Na + Cl2 -> 2NaCl, identify the limiting reactant if 2 moles of Na and 1 mole of Cl2 are available.

Accepted Answer

Cl2

Answer

Both Na and Cl2

Answer

Neither Na nor Cl2

Answer

Na

Question 30

Determine the hybridization of the carbon atom in methane (CH4).

Accepted Answer

sp3

Answer

sp2

Answer

sp3d

Answer

sp

Question 31

Calculate the pH of a solution with a [H+] concentration of 2.5 x 10^-5 M.

Accepted Answer

4.6

Answer

3.0

Answer

6.0

Answer

5.0

Question 32

Which of the following factors does NOT affect the rate of a chemical reaction?

Accepted Answer

The volume of the reactants

Answer

The concentration of the reactants

Answer

The temperature

Answer

The presence of a catalyst

Question 33

Identify the type of chemical reaction that occurs when an acid reacts with a base.

Accepted Answer

Neutralization

Answer

Precipitation

Answer

Oxidation

Answer

Combustion

Question 34

Which of the following reactions is highly exothermic?

Accepted Answer

The combustion of gasoline

Answer

The dissolution of salt in water

Answer

The melting of ice

Answer

The evaporation of water

Question 35

Which of the following is NOT a recognized type of chemical reaction?

Accepted Answer

Transmutation

Answer

Single displacement

Answer

Synthesis

Answer

Decomposition

Question 36

In the reaction 2CH4 + 3O2 → 2CO2 + 4H2O, 5 moles of CH4 and 7 moles of O2 are present. Identify the limiting reactant.

Accepted Answer

CH4

Answer

O2

Answer

CO2

Answer

H2O

Question 37

What is the maximum theoretical yield of product that can be obtained from a reaction based on stoichiometry?

Accepted Answer

Theoretical yield

Answer

Percent yield

Answer

Equilibrium yield

Answer

Actual yield

Question 38

Which of the following statements about chemical equilibrium is NOT true?

Accepted Answer

The concentrations of reactants and products do not change over time.

Answer

Equilibrium is a dynamic process.

Answer

The forward and reverse reactions occur at the same rate.

Answer

Equilibrium can be shifted by changing conditions.

Question 39

What is the conjugate acid of NH3?

Accepted Answer

NH4+

Answer

NH2-

Answer

OH-

Answer

H+

Question 40

Which of the following is a substance that speeds up a chemical reaction without being consumed itself?

Accepted Answer

Enzyme

Answer

Reactant

Answer

Inhibitor

Answer

Product