Across
- 5. A substance that starts a chemical reaction
- 7. A test carried out to discover something
- 8. Using senses to gather information
- 9. A substance formed in a chemical reaction
- 10. Having equal atoms on both sides of an equation
Down
- 1. A possible explanation for an observation
- 2. Gas changing directly to solid
- 3. A symbolic representation of a reaction
- 4. Solid changing directly to gas
- 6. A number that shows how many molecules are involved