Endothermic and exothermic reactions

Question 1

What is an exothermic reaction?

Answer 1

• Products hold less energy than reactants
• Energy is lost to the surroundings via heat
• E.G:
• Combustion
• Neutralisation (acids and bases)

Question 2

What is an endothermic reaction?

Answer 2

• Products hold more energy than reactants
• Energy is taken in from surroundings via heat

Question 3

What is activation energy?

Answer 3

• The minimum amount of energy the reactant particles need in order to collide and react with eachother