Across
- 3. when a gas becomes a liquid.
- 6. the amount of a substance in a set volume.
- 8. a substance that increases the rate of a chemical reaction without undergoing any permanent chemical change.
- 11. reaction procedure that produces new chemicals; same as chemical change.
- 12. substance made up of two or more different types of atoms bonded together, e.g. water.
Down
- 1. the damage caused to metal by its environment.
- 2. pure substance made up of only one type of atom, e.g. oxygen, carbon.
- 4. a molecule that contains only two atoms.
- 5. theory when substances react, their particles must come into contact or collide with each other.
- 7. to change state from a liquid to a gas.
- 9. when two objects remain attracted to each other.
- 10. Smallest particle of matter that cannot be created, destroyed or broken down.