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6. Which of the following is NOT a reason why copper is good for electrical wiring and plumbing?

  • It does not react with water
  • It is a good conductor of heat and electricity
  • It is cheap
  • It can be bent but is hard enough to make pipes or tanks

7. Copper can be extracted from copper-rich ores by heating the ores in a furnace this is also known as?

  • Bioleaching
  • Electrolysis
  • Smelting
  • Phytoming

8. Which of the following is NOT a reason why aluminium and titanium are useful metals

  • They are expensive
  • They have low density
  • They are resistant to corrosion

9. Phytomining and bioleaching are.. than smelting?

  • As environmentally friendly
  • Less dangerous
  • More environmentally friendly
  • Less environmentally friendly

10. What is the definition of an ore?

  • An ore contains enough metal to make it economic to extract the metal
  • An ore is a mixture of metals
  • An ore is the product of a reaction
  • An ore is an unreactive metal

11. What must happen to ores before the metal is extracted and purified?

  • The ore must be mined and concentrated
  • The ore must have more metals added to it
  • The ore must become less dense
  • The ore must be put in a catalyst

12. What is a specific property of a low carbon steels?

  • They are resistant to corrosion
  • They are easily shaped
  • They are hard
  • They are soft

13. What can be obtained from solutions of copper salts by electrolysis or by displacement using scrap iron?

  • Plants
  • Copper
  • Bacteria
  • Iron

14. Which of the following is NOT a reason why we should recycle metals

  • Expensive since they cannot conduct electricity
  • Extracting them uses limited resources
  • Expensive in terms energy
  • Expensive in terms of the effects on the enviroment

15. Metals that are more reactive than carbon, such as aluminium are extracted by?

  • Reduction by iron
  • Electrolysis
  • Reduction by oxygen
  • Reduction by carbon

16. What is used in bioleaching to break the bonds of copper compound and make a leachate solution?

  • Copper
  • Bacteria
  • Plants
  • Alloys

17. How can the copper be purifed?

  • Through heating
  • By reduction of carbon
  • By electrolysis
  • By reduction by iron

18. During electrolysis the positive metal ions move towards the negative electrode. Why does this happen?

  • Due to the negative sea of electrons
  • Because opposite charges attract
  • Due to photosynthesis
  • Because of the delocalised electrons

19. Metals that are less reactive than carbon can be extracted from their oxides by?

  • Reduction with carbon
  • Reduction with oxygen
  • Electrolysis
  • Catalysts

20. Why can't aluminium and titanium be extracted from their oxides by reduction with carbon?

  • They are more reactive than carbon
  • There are many stages in the processes
  • Large amounts of energy are needed
  • It's too expensive