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6. How does bio-leaching extract copper?
- bacteria gets energy from bonds between copper and sulfur.
- the bacteria uses their energy from respiration.
7. "Atoms aren't lost or made in chemical reactions". True or False
8. what was the earths early atmosphere made up of?
- Carbon dioxide, methane, ammonia and water vapour
- Oxygen, nitrogen and carbon dioxide
- Carbon dioxide, Methane, carbon monoxide and steam
9. How is steel formed?
- adding small amounts of carbon to pure iron
- adding large amounts of carbon to pure iron
10. What is phytomining?
- growing plants in soil that contains copper to extract it.
- Mining using double bonds in plants to extract copper.
- mining copper from ores
11. what products are formed when Calcium Carbonate thermally decomposes?
- Calcium oxide & Carbon dioxide
- Sulfuric Acid & Carbon dioxide
- Carbon dioxide & Water
12. what are alkanes?
- Chains of hydrocarbons, unsaturated with no double bonds.
- Chains of hydrocarbons, saturated with no double bonds
- Chains of hydrocarbons, saturated with double bonds
13. what is limestone mainly made of?
- Carbon dioxide
- Sulfur dioxide
- Calcium carbonate
- Crushed rocks
14. what particles does a compound of a metal and non metal contain?
15. How do you make cement?
- Powered limestone and clay
- crushed rocks, clay and water
16. What is fermentation
- dissolving sugar in water and adding yeast to make ethene
- Fertilising an embryo
- Dissolving sugar and adding ethene gas to make ethane.
17. what particles does a compound of non metals contain
18. How is stainless steel made?
- chromium, carbon, iron and sometimes nickel
- chromium, carbon, iron
- chromium, carbon, iron, nickel
19. How do you make concrete?
- Cement, aggregate, sand
- mortar, aggregate, sand, water
20. What is smelting?
- reduction with carbon
- heating a rock
- reduction with oxygen
