Skip to content
Back to quiz
6. A reaction is endothermic when ...
- Energy to break bonds = Energy to make bonds
- Energy to break bonds > Energy to make bonds
- Energy to break bonds < Energy to make bonds
7. An electron-exchange column is used to remove hardness from water.
8. What colour precipitate is formed when Fe3+ is added to sodium hydroxide?
- Blue
- White
- Brown
- Yellow
- Green
9. Why are catalysts used?
- To increase the activation energy needed
- To reduce the activation energy needed
- To lower the reactants' energy
- To slow the reaction down
- To increase the reactants' energy