Exothermic and Endothermic Changes

Select the change which transfers energy to the surroundings.

• Physical change

• Chemical reaction

• Exothermic change

• Endothermic change

Select the best explanation for why burning a candle is an exothermic change.

• The surroundings are warmed up.

• The surroundings are cooled down.

• The surroundings keep a fixed temperature.

• None of these reasons.

Mr. Leach mixes sodium hydroxide and sulfuric acid. The temperature of the solution increases by 10 degrees. Write down the type of change this is.

Mr. Leach mixes sodium hydroxide and hydrochloric acid. The temperature of the solution decreases by 15 degrees. Write down the type of change this is.

Select the change which transfers energy from the surroundings to the substance.

• Physical change

• Chemical reaction

• Exothermic change

• Endothermic change

Select the best explanation for why an ice pack uses an endothermic reaction.

• The surroundings around the ice pack warm up when used.

• The surroundings around the ice pack cool down when used.

• The temperature of the surroundings does not change.

• None of these reasons.

Select the example of an exothermic reaction.

• Melting

• Combustion

• Boiling

• Neutralisation

Select the example of an endothermic reaction.

• Melting

• Combustion

• Condensation

• Freezing