Exothermic and Endothermic Reactions

Question 1

define an exothermic reaction and give examples

Answer 1

reaction that transfers energy to the surroundings so the temperature of the surroundings increases.
for example: combustion, oxidation and neutralisation

everyday uses: hand warmers and self-heating cans

Question 2

define an endothermic reaction and give examples

Answer 2

reaction that takes in energy from the surroundings so the temperature of the surroundings decreases
for example: thermal decomposition

everyday uses: sports injury packs

Question 3

define activation energy

Answer 3

the minimum amount of energy that particles must have to react