Across
- 1. Needed when you start a car engine.
- 5. matter can be entered from.
- 6. amount of a substance in a given volume.
- 9. the atoms rearrange to form new substances.
- 12. a number placed in front of a chemical formula.
- 15. When two or more elements or compounds combine.
- 17. When one element replaces another element.
- 18. matter is not created or destroyed.
Down
- 2. melting ice cubes.
- 3. the mixing of two liquids.
- 4. any change that alters the form.
- 7. A way to show chemical reaction using symbols.
- 8. substances that undergo the chemical changes.
- 10. burning of a candle.
- 11. Occurs when compounds breakdown
- 13. matter does not enter or leave.
- 14. new substances that form.
- 16. increases the reaction rate.