1. Endothermic and exothermic
Reactions
Endothermic and exothermic

2. Endothermic Reactions
An endothermic reaction is accompanied by or requires the absorption of heat.
Endothermic reactions take in energy from another source to provide the activation energy required for a reaction to occur.
Examples of endothermic reactions:
Photosynthesis
Making ice cream
Baking bread
Cooking an egg
Melting ice

3. Endothermic Reaction Images

4. Exothermic Reactions
An exothermic reaction is accompanied by the release of heat.
Exothermic reactions release heat due to there being excess energy in the reaction.
Examples of exothermic reactions:
Mixing water and strong acids
Making ice cubes
Nuclear fission
Burning sugar
A candle flame
Fire

5. Exothermic Reaction Images

6. Comparing Exothermic and Endothermic Reactions
Releases energy
Reactants have more stored energy
Products have less stored energy
Absorbs energy
Reactants have less stored energy
Products have more stored energy

7. Comparing Exothermic and Endothermic Reactions