Extraction & Uses of Metals Quiz
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5 questions, one answer each
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1. Why is gold found as the uncombined element in the Earth's crust?
- A. It is very reactive
- B. It is very unreactive
- C. It only exists as an ore
- D. It reacts easily with oxygen
2. Which method is used to extract iron from its ore?
- A. Electrolysis of the molten ore
- B. Reduction with carbon
- C. Found uncombined in rock
- D. Reaction with dilute acid
3. Why must aluminium be extracted by electrolysis rather than reduction with carbon?
- A. Aluminium ore does not contain oxygen
- B. Aluminium is more reactive than carbon, so carbon cannot displace it
- C. Aluminium melts at too low a temperature for carbon reduction
- D. Electrolysis is cheaper than carbon reduction
4. A new metal ore is discovered and the metal is found to sit just above iron but below aluminium in the reactivity series. What extraction method would you expect to comment is used?
- A. Found uncombined, as it is unreactive
- B. Electrolysis, as it is more reactive than carbon
- C. Reduction with carbon, as it is less reactive than carbon
- D. Reduction with hydrogen only
5. Why are alloys generally harder than the pure metals they are made from?
- A. Alloys have fewer free electrons
- B. Different-sized atoms in the alloy distort the regular layers, preventing them sliding easily
- C. Alloys have a lower melting point
- D. Alloys contain no metallic bonding