Heat is always evolved in a/an __________ reaction.
What is exothermic and an endothermic reaction? Amongst the following reactions, identify the exothermic reaction and the endothermic reaction: 1. Heating coal in air to form carbon dioxide. 2. Heating limestone in lime kiln to form quick lime. [3 MARKS]
The reaction in which energy is absorbed is called as a/an _____________.