topic 5
Cards (5)
- Endothermic - breaking bonds - energy taken in
- exothermic - forming bonds - energy given out
- in a chemical reaction
- bonds in reactants are broken
- new bonds in the products are made
- a reaction is exothermic if more heat energy is released in making bonds than breaking bonds
- a reaction is endothermic if less heat energy is released in making bonds than in breaking bonds