Across
- 4. used to extract metals
- 8. loss of electrons
- 9. absorbs energy
- 10. produces salt and water
- 11. releases heat
- 12. has a pH above 7
- 13. join to make polymers
- 16. prevents rusting
- 17. biological catalyst
- 19. positive ions
Down
- 1. acid + base
- 2. breaks down glucose
- 3. joins monomers
- 5. shows pH
- 6. forms simper substances
- 7. wears away metal
- 14. extracts metal from ore
- 15. speeds up reactions
- 18. negative ions