Across
- 4. properties that can be observed without changing its identity
- 6. properties that can be observed as it reacts with other substances
- 8. when a fuel burns in oxygen and produces C02,H20 and thermal energy
- 9. substances that react at the start of a reaction
- 10. anything that has mass and volume
Down
- 1. uses chemical formulas and symbols to describe a chemical reaction
- 2. when 2 or more substances combine and form a complex substance
- 3. when 1 substance breaks down into 2 or more substances
- 5. number in front of the formula that tells us how many molecules are present
- 7. substances formed at the end of a reaction