Energy Changes: Interactive Quizzes and Learning Materials

Question 1

Exothermic reactions release energy. Which of these is an example of an exothermic reaction?

Accepted Answer

Burning wood

Answer

Melting ice

Answer

Dissolving salt in water

Question 2

What is the term for the energy required to break bonds between atoms?

Accepted Answer

Activation energy

Answer

Heat energy

Answer

Kinetic energy

Answer

Potential energy

Question 3

Which of the following is a defining feature of a catalyst?

Accepted Answer

It speeds up the reaction.

Answer

It is consumed during the reaction.

Answer

It alters the reaction's products.

Answer

It exists only in solid form.

Question 4

What is the primary function of a calorimeter?

Accepted Answer

Measuring the heat released or absorbed in a reaction.

Answer

Measuring the temperature of a reaction.

Answer

Accelerating chemical reactions.

Answer

Preventing chemical reactions.

Question 5

Which of the following is the unit used to measure energy?

Accepted Answer

Joule

Answer

Kelvin

Answer

Celsius

Answer

Newton

Question 6

What is the fundamental principle of the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transferred or transformed.

Answer

Energy is always lost during a chemical reaction.

Answer

Energy is always gained during a chemical reaction.

Answer

The total amount of energy in the universe is constantly changing.

Question 7

Which of the following involves a chemical change, where one or more new substances are formed?

Accepted Answer

Burning wood

Answer

Melting ice

Answer

Boiling water

Answer

Freezing water

Question 8

Which of the following reactions absorbs energy from the surroundings, making it an endothermic reaction?

Accepted Answer

Photosynthesis

Answer

Combustion of propane

Answer

Condensation of water vapour

Answer

Dissolving ammonium chloride in water

Question 9

What is the scientific symbol used to represent the energy change in a chemical reaction?

Accepted Answer

ΔH

Answer

ΔE

Answer

ΔS

Answer

ΔG

Question 10

Which of the following reactions is likely to require the input of heat energy in order to occur?

Accepted Answer

Rusting of iron

Answer

Burning of methane

Answer

Neutralisation of an acid and an alkali

Answer

Dissolution of sodium chloride in water

Question 11

Which of the following is an example of an application of endothermic reactions in everyday life?

Accepted Answer

Cooling food

Answer

Heating homes

Answer

Manufacturing fertilisers

Answer

Producing electricity

Question 12

Which of the following best describes an exothermic reaction?

Accepted Answer

A reaction that releases heat into the surroundings

Answer

A reaction that absorbs heat from the surroundings

Answer

A reaction that results in an increase in temperature

Answer

A reaction that results in a decrease in temperature

Question 13

What is the effect of an endothermic reaction on the temperature of the surroundings?

Accepted Answer

Decreases the temperature

Answer

Increases the temperature

Answer

Has no effect on the temperature

Answer

Varies the temperature randomly

Question 14

What is the term for the energy released or absorbed during a chemical reaction?

Accepted Answer

Enthalpy change

Answer

Activation energy

Answer

Kinetic energy

Answer

Potential energy

Question 15

Which of the following reactions is most likely to be endothermic?

Accepted Answer

Respiration

Answer

Combustion

Answer

Decomposition

Answer

Neutralisation

Question 16

Which of the following is an example of an exothermic reaction?

Accepted Answer

Burning wood

Answer

Melting ice

Answer

Dissolving sugar in water

Answer

Sublimation of dry ice

Question 17

What occurs to the temperature of the surroundings during an endothermic reaction?

Accepted Answer

Decreases

Answer

Increases

Answer

Stays the same

Answer

Fluctuates

Question 18

How are activation energy and heat of reaction distinct?

Accepted Answer

Activation energy is the energy required to initiate a reaction, while heat of reaction is the energy released or absorbed during the reaction.

Answer

Heat of reaction is the energy required to initiate a reaction, while activation energy is the energy released or absorbed during the reaction.

Answer

Activation energy and heat of reaction are the same concept.

Answer

Neither of the above.

Question 19

What is the definition of enthalpy change in a reaction?

Accepted Answer

The difference in energy between the products and reactants

Answer

The total energy released during a reaction

Answer

The total energy absorbed during a reaction

Answer

The energy needed to activate a reaction

Question 20

Which reaction is most likely to release energy (exothermic)?

Accepted Answer

Burning methane

Answer

Rusting of iron

Answer

Electrolysis of water

Answer

Melting of ice

Question 21

What is the main difference between an exothermic and an endothermic reaction?

Accepted Answer

Exothermic reactions release heat, while endothermic reactions absorb heat.

Answer

Exothermic reactions absorb heat, while endothermic reactions release heat.

Answer

Exothermic reactions involve the breaking of bonds, while endothermic reactions involve the formation of bonds.

Answer

Endothermic reactions involve the breaking of bonds, while exothermic reactions involve the formation of bonds.

Question 22

Which of the following is NOT a factor that affects the rate of a chemical reaction?

Accepted Answer

Age of the reactants

Answer

Temperature

Answer

Concentration of reactants

Answer

Presence of a catalyst

Question 23

What is the role of a catalyst in a chemical reaction?

Accepted Answer

It lowers the activation energy of the reaction.

Answer

It increases the activation energy of the reaction.

Answer

It provides an alternative pathway for the reaction to occur.

Answer

It decreases the concentration of reactants.

Question 24

What is the chemical equation for the combustion of methane?

Accepted Answer

CH₄ + 2O₂ → CO₂ + 2H₂O

Answer

CH₄ + O₂ → CO + 2H₂

Answer

CH₄ + 2O₂ → C + 4H₂O

Answer

CH₄ + O₂ → CO₂ + H₂

Question 25

Which of the following is a renewable energy source?

Accepted Answer

Solar energy

Answer

Coal

Answer

Natural gas

Answer

Nuclear energy

Question 26

What is the difference between potential energy and kinetic energy?

Accepted Answer

Potential energy is stored energy, while kinetic energy is energy of motion.

Answer

Kinetic energy is stored energy, while potential energy is energy of motion.

Answer

Potential energy is energy of motion, while kinetic energy is stored energy.

Answer

Kinetic energy and potential energy are the same thing.

Question 27

When wood burns, heat and light are released into the surroundings. What type of reaction is this?

Accepted Answer

Exothermic

Answer

Endothermic

Answer

Decomposition

Answer

Neutralization

Question 28

During an endothermic reaction, the surroundings usually feel:

Accepted Answer

Cooler

Answer

Hotter

Answer

The same temperature

Answer

Slightly warmer

Question 29

Which factor will **slow down** the rate of an endothermic reaction?

Accepted Answer

Decrease the surface area of the reactants

Answer

Increase temperature

Answer

Add a catalyst

Answer

Increase the concentration of the reactants

Question 30

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

Accepted Answer

Completion of the reaction

Answer

Temperature

Answer

Concentration of reactants

Answer

Surface area of reactants

Question 31

Which characteristic is unique to a catalyst?

Accepted Answer

Lowers the activation energy of a reaction

Answer

Increases the activation energy of a reaction

Answer

Is consumed in the reaction

Answer

Is a product of the reaction

Question 32

What is the minimum amount of energy required for a reaction to start called?

Accepted Answer

Activation energy

Answer

Maximum energy

Answer

Reaction energy

Answer

Bond energy

Question 33

Human activities primarily contribute to which greenhouse gas in the atmosphere?

Accepted Answer

Carbon dioxide

Answer

Methane

Answer

Nitrous oxide

Answer

Sulfur dioxide

Question 34

The minimum amount of energy required for a chemical reaction to occur is known as:

Accepted Answer

Activation energy

Answer

Enthalpy

Answer

Entropy

Answer

Gibbs free energy

Question 35

A catalyst in a chemical reaction:

Accepted Answer

Decreases the activation energy of the reaction

Answer

Increases the activation energy of the reaction

Answer

Changes the products of the reaction

Answer

Stops the reaction from occurring

Question 36

Which of the following is NOT a renewable energy source?

Accepted Answer

Natural gas

Answer

Solar energy

Answer

Wind energy

Answer

Hydropower

Question 37

The effectiveness of an energy-consuming device is determined by its:

Accepted Answer

Efficiency

Answer

Power

Answer

Energy consumption

Answer

Work output

Question 38

Which of the following measures the rate of energy transfer?

Accepted Answer

Watt

Answer

Joule

Answer

Calorie

Answer

Electronvolt

Question 39

According to the law of conservation of energy:

Accepted Answer

The total amount of energy in an isolated system remains constant

Answer

Energy can be created or destroyed during a chemical reaction

Answer

Energy can be transformed from one form to another

Answer

Energy is always lost during a reaction

Question 40

Which of the following reactions releases heat?

Accepted Answer

Burning of wood

Answer

Melting of ice

Answer

Dissolving salt in water

Answer

Evaporation of water

Question 41

How does an exothermic reaction affect temperature?

Accepted Answer

Increases temperature

Answer

Decreases temperature

Answer

No effect on temperature

Answer

Temperature affects the reaction

Question 42

Which device uses an exothermic reaction?

Accepted Answer

Heating pad

Answer

Fire extinguisher

Answer

Refrigerator

Answer

Air conditioner

Question 43

How are heat and temperature different?

Accepted Answer

Heat is energy, temperature measures particle energy.

Answer

Temperature is energy, heat measures particle energy.

Answer

Heat and temperature are the same.

Answer

Heat measures particles, temperature measures their energy.

Question 44

When fuel burns, what energy transformation occurs?

Accepted Answer

Chemical to thermal

Answer

Thermal to chemical

Answer

Kinetic to thermal

Answer

Sound to thermal

Question 45

What does a catalyst do in a reaction?

Accepted Answer

Increases reaction rate without being consumed

Answer

Decreases reaction rate without being consumed

Answer

Is consumed in the reaction

Answer

Has no effect on the reaction

Question 46

Which energy source is renewable?

Accepted Answer

Solar power

Answer

Coal

Answer

Natural gas

Answer

Nuclear power

Question 47

Identify the exothermic reaction from the following:

Accepted Answer

Burning of fuel

Answer

Dissolving salt in water

Answer

Photosynthesis

Answer

Melting of ice

Question 48

What happens to the temperature of a system that absorbs energy?

Accepted Answer

Increases

Answer

Decreases

Answer

Becomes negative

Answer

Remains constant

Question 49

Which of the following processes involves a release of chemical energy?

Accepted Answer

Respiration

Answer

Condensation

Answer

Evaporation

Answer

Sublimation

Question 50

What is the SI unit of energy?

Accepted Answer

Joule

Answer

Celsius

Answer

Watt

Answer

Newton

Question 51

Which of the following factors can affect the rate of a chemical reaction?

Accepted Answer

Temperature

Answer

Time of day

Answer

Shape of the container

Answer

Color of the reactants

Question 52

What is the term for a reaction that requires energy in order to occur?

Accepted Answer

Endothermic

Answer

Exothermic

Answer

Catalytic

Answer

Spontaneous

Question 53

Which of the following is an example of a physical change?

Accepted Answer

Melting of ice

Answer

Burning of wood

Answer

Digestion of food

Answer

Rusting of iron

Question 54

What is the process called when a substance absorbs heat and changes from a liquid to a gas?

Accepted Answer

Evaporation

Answer

Freezing

Answer

Sublimation

Answer

Condensation

Question 55

What is the name of the energy carrier molecule found in cells?

Accepted Answer

ATP

Answer

ADP

Answer

FADH2

Answer

NADH