Energy Change Year 10 2026

Multiple Choice

Which of the following best describes the significance of energy transfer in chemical reactions?

• It determines whether a reaction absorbs or releases energy.

• It only affects the speed of the reaction.

• It is not important in chemistry.

• It only occurs in physical changes.

Open Ended

What do we mean by the terms endothermic and exothermic? Can you give any examples of each?

Multiple Choice

Which type of reaction absorbs heat from its surroundings, making them cooler?

• Exothermic

• Endothermic

• Combustion

• Neutralisation

Open Ended

Describe the difference between exothermic and endothermic reactions in terms of energy transfer.

Multiple Choice

A mixture bubbled vigorously but the temperature dropped 15°C. Is this reaction endothermic or exothermic?

• Endothermic

• Exothermic

• Neutralisation

• Combustion

Multiple Select

Which of the following are examples of exothermic reactions?

• Combustion of fuels

• Photosynthesis

• Detonation of explosives

• Reaction of acids with metals

Open Ended

Explain why the reaction between magnesium and hydrochloric acid is classified as exothermic.

Fill in the Blank

Magnesium reacts with hydrochloric acid and the temperature rises from 25°C to 45°C. This is an example of an ___ reaction.

Multiple Choice

What happens to the temperature of the reaction mixture during an exothermic reaction?

• It rises

• It falls

• It stays the same

• It fluctuates

Open Ended

Explain how chemical energy is transformed during an exothermic reaction, using the temperature changes shown in the diagrams.

Multiple Select

Which statements about exothermic reactions are correct?

• Reactants have more chemical energy than products

• Heat is lost to the surroundings

• Products have more chemical energy than reactants

• The reaction mixture gets colder

Fill in the Blank

In an exothermic reaction, ΔH is ___ because the products have less energy than the reactants.

Open Ended

Write down one thing you knew before this lesson and two things you didn’t know before this lesson.

Multiple Choice

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

• Photosynthesis

• Combustion

• Rusting of iron

• Condensation

Multiple Select

Select all processes that are examples of endothermic reactions.

• Melting ice cubes

• Evaporating water

• Burning wood

• Baking bread

Open Ended

Explain how baking bread is an example of an endothermic process.

Fill in the Blank

Endothermic reactions cause a decrease in ___ .

Multiple Choice

Which statement best describes what happens to the temperature of the reaction mixture during an endothermic reaction?

• It increases rapidly and stays high.

• It decreases as heat is absorbed and then returns to room temperature.

• It remains constant throughout.

• It fluctuates randomly.

Open Ended

Describe the energy changes that occur during the reaction of ammonium nitrate with water.

Open Ended

Explain why the enthalpy change (ΔH) is positive in endothermic reactions, using the energy profile diagrams shown.

Multiple Choice

Which statement best describes the energy change in an endothermic reaction?

• Energy is released and ΔH is negative.

• Energy is taken in and ΔH is positive.

• Energy is released and ΔH is positive.

• Energy is taken in and ΔH is negative.

Open Ended

Describe the difference between exothermic and endothermic reactions using energy profile diagrams.

Fill in the Blank

In an exothermic reaction, the products have ___ energy than the reactants.

Multiple Select

Which of the following are true about endothermic reactions?

• They take in energy from the surroundings.

• The temperature of the surroundings increases.

• ΔH is positive.

• Products have more energy than reactants.

Multiple Select

Which of the following statements about bond breaking and bond forming is correct?

• Bond breaking is an exothermic process.

• Bond forming is an endothermic process.

• Bond breaking is an endothermic process.

• Bond forming is an exothermic process.

Multiple Choice

Which of the following best describes an endothermic reaction?

• A reaction that releases heat to its surroundings

• A reaction that absorbs heat from its surroundings

• A reaction that produces light

• A reaction that forms a precipitate

Open Ended

Reflecting on today's lesson about energy transfer, what is one real-life example of an endothermic or exothermic process you have observed or learned about?