A:
Exothermic reactions release heat, like a warm campfire. Examples include burning wood or the reaction between baking soda and vinegar.
Endothermic reactions absorb heat, making their surroundings cooler, like how an ice pack gets cold when you activate it. An example is when barium hydroxide mixes with ammonium thiocyanate.
This question belongs to the first chapter of the CBSE 10th Std Science book: Chemical Reactions and Equations
