Endothermic and Exothermic Reactions (1)

Thermochemistry

Study of heat changes when chemical reaction occur

Applications of thermochemistry in our daily life

Instant hot packs and instant cold packs

Instant hot packs

Used to release heat into the surroundings

Two types of chemical reaction based on the heat change

Exothermic reactions and endothermic reactions

Exo

outside

Endo

Inside

Exothermic reactions

Heat is released into the surroundings

Endothermic reactions

Heat is absorbed from the surroundings

Example of exothermic reactions

Burning of paper, bomb explosion and respiration

Example of endothermic reactions

Photosynthesis, cake baking and dissolving ammonium salt in water