Across
- 4. all symbol equations must be this
- 5. used to test for carbon dioxide
- 9. the chemicals made in a reaction
- 13. reaction where heat is transferred to the surroundings
- 14. the mass of reactants always equals the mass of the products
- 17. a fuel made millions of years ago
- 19. change where a chemical changes form but is the same substance
Down
- 1. when iron is oxidised
- 2. speeds up a reaction but is not used up
- 3. decomposition using heat
- 6. in an equation means react to make
- 7. reaction where heat is taken in from the surroundings
- 8. burning
- 10. reaction when a substance is broken down into simpler substances
- 11. will run out one day
- 12. the chemicals used to start a reaction
- 15. a chemical reaction where oxides are made
- 16. change when 2 reactants form a new substance
- 18. burns to release energy