Across
- 4. A substance that speeds up a chemical reaction without being permanently changed.
- 6. When one substance breaks down into two or more substances.
- 8. Formed from 2 or more elements proportions are always the same.
- 9. When one element replaces a similar element forming a new element.
- 10. When two or more substances combine to form another.
Down
- 1. When the energy given off is thermal energy.
- 2. The number of molecules in a chemical equation.
- 3. Substance with atoms that are alike
- 5. When a substance reacts with oxygen to produce energy in the form of light or heat.
- 7. When water or gas forms two ionic compounds in solution are combined.