Across
- 4. before a chemical reaction takes place
- 6. of mass: can not be created or destroyed
- 8. what is this unit
- 9. the year of the great discovery
Down
- 1. anything that has mass and takes up space
- 2. Lavoisier: a great discovery
- 3. all chemical equations must be this
- 5. cant be created or destroyed
- 7. after a chemical reaction takes place