Across
- 3. _______ distillation - a process for separating liquids by their boiling points. (10)
- 4. A chemical that increases the rate of a reaction by reducing the activation energy. (8)
- 7. Smoke particles released by burning hydrocarbon fuels (12)
- 10. Water that can be safely drunk. (7)
- 11. A factor that affects the rate of a reaction. (11)
- 12. A chemical that fits the general formula CnH2n+2. (6)
- 13. The source of the Earth's early atmosphere. (9)
- 15. Much of the Earth's CO2 has dissolved into the ______ (6)
- 17. A factor that affects the rate of a reaction. (13)
- 18. A process for purifying copper using bacteria. (11)
- 19. A substance made of one type of compound or element (4)
- 20. A process for purifying copper using planats. (11)
Down
- 1. Particles may react when they ________. (7)
- 2. A mixture designed for a purpose (11)
- 5. A factor that affects the rate of a reaction. (11)
- 6. A system where atoms and energy cannot enter or leave. (6)
- 7. The process that decreased CO2 in the air and replaced it with O2 (14)
- 8. A process for splitting large hydrocarbons into smaller ones. (8)
- 9. A chemical that fits the general formula CnH2n. (6)
- 14. _________ energy - the minimum energy needed for particles to react. (10)
- 16. A chemical made from a chain of repeating units (7)