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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?

  • negatively
  • positively

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