Alloys and Their Properties Quiz
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5 questions, one answer each
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1. What is an alloy?
- A. A pure element with no impurities
- B. A mixture of a metal with other elements
- C. A compound formed only between two non-metals
- D. A metal that has been melted and reformed with no changes
2. Which two elements make up brass?
- A. Iron and carbon
- B. Copper and zinc
- C. Aluminium and magnesium
- D. Iron and chromium
3. Stainless steel is an alloy of iron with which other elements?
- A. Copper and zinc
- B. Chromium, nickel and carbon
- C. Aluminium and tin
- D. Silver and gold
4. Why are alloys generally harder and stronger than the pure metals from which they are made?
- A. The alloy contains fewer atoms overall
- B. Different-sized atoms in the alloy distort the regular layers, preventing them sliding over each other easily
- C. Alloys have stronger covalent bonds between atoms
- D. Alloying removes all delocalised electrons
5. A manufacturer wants to make cutlery that is hard-wearing and resists rusting. Using your knowledge of alloy structure, explain why stainless steel is a better choice than pure iron.
- A. Pure iron has a lower melting point, so it would melt during use
- B. Stainless steel's chromium and nickel atoms distort the metallic layers, increasing hardness, and its composition improves corrosion resistance compared with pure iron
- C. Pure iron is a non-metal so it cannot conduct heat
- D. Stainless steel has no metallic bonding, making it more rigid