C3.2.1 - Exothermic and endothermic reactions

Question 1

What is an exothermic reaction?

Answer 1

• When the amount of energy absorbed to break bonds is greater than the amount of energy released when bonds are formed
• Overall transfer of energy to the surroundings

Question 2

What is an endothermic reaction?

Answer 2

• When the amount of energy absorbed to break bonds is less than the amount of energy released when bonds are formed
• Overall transfer of energy from the surroundings

Question 3

What is combustion?

Answer 3

A reaction in which substance burns in oxygen

Question 4

What is neutralisation?

Answer 4

A reaction between an acid and a base or alkali, producing a salt and water