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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