Across
- 3. frozen as ice
- 4. equation
- 5. a substance used in a reaction
- 6. a liquid becomes a gas
- 7. a solid changes directly into a gas
- 9. a silvery metal
Down
- 1. the same chemical properties
- 2. a substance made by a reaction
- 4. a gas becomes a liquid
- 8. can not be created or destroyed
- 10. in the air