Across
- 3. separate mixtures of substances in crude oil
- 4. least reactive metal
- 6. hydrogen and carbon
- 9. measures the acidity of a substance
- 10. most reactive metal
- 11. where does most plastic waste go?
- 14. means 'splitting up using electricity'
- 15. there is an infinite amount of this substance
Down
- 1. group 7 on the periodic table
- 2. who designed the first periodic table?
- 5. gives out energy to its surroundings
- 7. water that contains dissolved calcium and magnesium ions
- 8. thing that helps speed up a chemical reaction
- 12. 78% of gas in the earth's atmosphere
- 13. flame colour of potassium when burned