Transition Metals, Alloys & Corrosion Quiz
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5 questions, one answer each
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1. Which of these is NOT a typical property of transition metals?
- A. High melting point
- B. Low density
- C. Formation of coloured compounds
- D. Catalytic activity
2. What two conditions must both be present for iron to rust?
- A. Heat and light
- B. Oxygen and water
- C. Carbon dioxide and heat
- D. Salt and light
3. In sacrificial protection, why does the attached metal corrode instead of the iron?
- A. It is heavier than iron
- B. It is a better conductor of heat
- C. It loses electrons more easily than iron
- D. It has a lower melting point
4. A student mixes different-sized atoms into a pure metal to make an alloy. Why does this usually make the alloy stronger?
- A. The different atoms react chemically with the metal
- B. The different-sized atoms distort the regular layers, making it harder for layers to slide
- C. The alloy becomes less dense
- D. The melting point decreases, making it more flexible
5. A manufacturer chooses brass (a copper-zinc alloy) instead of pure copper for door handles because it is harder and resists corrosion better. Which statement best explains why alloying achieves this compared with pure copper?
- A. Brass has more free electrons than copper, making it a worse conductor
- B. Zinc atoms are a different size from copper atoms, disrupting the regular layers and preventing them sliding easily, so the alloy is harder than pure copper
- C. Brass has a lower melting point than copper, which makes it stronger
- D. Zinc reacts with oxygen to remove all corrosion risk permanently