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6. what are two new methods of extracting copper?
- bioleaching and phytomining
- phytoleaching
- biomining
- bioleaching
7. are electons positively or negatively charged?
8. atoms are represented by...
- symbols
- long words
- pictures
9. what charge do atoms have?
- negative
- neutral
- positive
10. the shorter the molecule the...
- higher the boiling point
- more viscous the hydrocarbon is
- more runny the hydrocarbon is
- less stetchy the hydrocarbon is
11. when water is added to calcium oxide what is produced?
- calcium hydroxide
- calcium carbonate
- oxygen
12. what is limestone mainly made of?
- carbon dioxide
- calcium carbonate
- calcium
13. what is electrolysis?
- breaking down a substance using electricity
- an electric current
14. what is the most reactive element of the reactivity series?
- carbon
- potassium
- calcium
- aluminium
15. what does sulfur dioxide cause?
- acid rain
- clean rain
- snow
- meteor showers
16. when copper ore is heated in a furnace what is this called?
- smlting
- electrolysis
- reduction