Free Printable Exothermic and Endothermic Reactions Quiz

1.

Which of the following statements correctly describes an exothermic reaction?

a)

Energy is absorbed from the surroundings, and the enthalpy change ( $\Delta H$ ) is positive.

b)

Energy is released to the surroundings, and the enthalpy change ( $\Delta H$ ) is negative.

c)

Energy is absorbed from the surroundings, and the enthalpy change ( $\Delta H$ ) is negative.

d)

Energy is released to the surroundings, and the enthalpy change ( $\Delta H$ ) is positive.

2.

In an endothermic reaction, which of the following occurs?

a)

Bond making releases more energy than bond breaking.

b)

Bond breaking absorbs more energy than bond making releases.

c)

Bond making absorbs more energy than bond breaking releases.

d)

Bond breaking releases more energy than bond making absorbs.

3.

What is the unit of molar enthalpy change?

a)

kJ

b)

kJ mol $^{-1}$

c)

kJ g $^{-1}$

d)

J mol $^{-1}$

4.

Which of the following is a characteristic of an energy profile diagram for an exothermic reaction?

a)

The products are at a higher energy level than the reactants.

b)

The reactants are at a higher energy level than the products.

c)

The energy level of the reactants and products is the same.

d)

The activation energy is zero.

5.

In the complete combustion of methane ( $CH_4$ ), which of the following is the correct balanced thermochemical equation?

a)

$CH_4(g) + 2O_2(g) \rightarrow CO_2(g) + 2H_2O(l) + 890 \text{ kJ}$

b)

$CH_4(g) + O_2(g) \rightarrow CO(g) + 2H_2O(l) + 890 \text{ kJ}$

c)

$CH_4(g) + 2O_2(g) \rightarrow CO_2(g) + 2H_2O(l) - 890 \text{ kJ}$

d)

$CH_4(g) + 2O_2(g) \rightarrow CO_2(g) + 2H_2O(l)$

6.

Which of the following is true for the incomplete combustion of a hydrocarbon?

a)

It produces only carbon dioxide and water.

b)

It produces carbon monoxide, carbon, and water.

c)

It requires more oxygen than complete combustion.

d)

It is an endothermic process.

7.

What is the enthalpy change for a reaction if the energy required to break bonds is 500 kJ and the energy released in making bonds is 800 kJ?

a)

$-300$ kJ

b)

$300$ kJ

c)

$-1300$ kJ

d)

$1300$ kJ

8.

Which of the following best describes the enthalpy change for mixtures measured in kJ g $^{-1}$ ?

a)

It is the energy change per mole of substance.

b)

It is the energy change per gram of mixture.

c)

It is the total energy change for the reaction.

d)

It is the energy change per litre of solution.

9.

In an energy profile diagram, what does the peak of the curve represent?

a)

The energy of the reactants.

b)

The energy of the products.

c)

The activation energy.

d)

The enthalpy change of the reaction.

10.

Which of the following is a correct statement about bond making and bond breaking in chemical reactions?

a)

Bond making is an endothermic process.

b)

Bond breaking is an exothermic process.

c)

Bond making is an exothermic process.

d)

Bond breaking is an endothermic process.

Exothermic and Endothermic Reactions Quiz

Total questions: 10

Worksheet time: 5mins

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