Exothermic and Endothermic Reactions

Question 1

What are Exothermic reactions?

Answer 1

EXOthermic - Reactions that transfer energy to the surroundings

Question 2

What are Endothermic reactions?

Answer 2

ENDOthermic - Reactions which take in energy from its surroundings

Question 3

What happens to the surrounding temperature in an exothermic reaction?

Answer 3

It increases because energy (usually heat energy) is transferred to the surroundings.

Question 4

What happens to the surrounding temperature in an endothermic reactions?

Answer 4

It decreases because energy (usually heat energy) is taken from its surroundings.

Question 5

Give three examples of an exothermic reaction.

Answer 5

1. Burning
2. Neutralisation reactions between acids and alkalis
3. The reaction between water and calcium oxide

Question 6

Give three examples of an endothermic reaction.

Answer 6

1. Electrolysis
2. The reaction between ethanoic acid and sodium carbonate
3. The thermal decomposition of calcium carbonate in a blast furnace