| 19. Bronze is an alloy of tin and copper.
The diagrams show the arrangement of atoms in pure copper and in bronze.
Which of the following statements about copper and bronze are true?
| I. Bronze is less malleable than pure copper |
| II. Tin atoms distort the copper lattice preventing the layers of copper atoms from sliding over each other |
| III. Tin and copper atoms are chemically combined in the lattice |
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- A. I and II only
- B. I and III only
- C. II and III only
- D. I, II and III
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12. Mild steel is an alloy of iron and carbon. Which statement is true?
- A. The carbon makes the alloy softer than iron
- B. The carbon makes the alloy harder than iron
- C. The carbon stops the iron from rusting
- D. The carbon makes the alloy a better conductor than iron
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13. Which of the following is not an alloy?
- A. brass
- B. steel
- C. magnalium
- D. nickel
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14. Aluminium is used for window frames because it ...
- A. is a good conductor of electricity
- B. has a low density
- C. resists corrosion
- D. has a low melting point
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| 15. Aluminium is used to make cans for soft drinks. |
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Aluminium is suitable for this use because it ...
- A. is malleable and conducts electricity
- B. is malleable and has a low density
- C. has a low melting point and conducts electricity
- D. has a low melting point and a low density
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16. Steel is an alloy of iron and is strong. This property makes steel a good metal for use in ...
- A. coins
- B. overhead electricity cables
- C. Window frames
- D. Railway tracks
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17. Which metal is suitable to use in the sacrificial protection of iron?
- A. lead
- B. magnesium
- C. silver
- D. tin
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18. Alloys are typically stronger than pure metals because ...
- A. the metallic bonding is stronger in alloys
- B. the layers of metal atoms in the alloy cannot easily slide over each other
- C. alloys are covalently bonded and covalent bonds are strong
- D. the metals atoms are all very regularly arranged in alloys
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19. Stainless steel used to make kitchen sinks because it is ...
- A. corrosion resistant
- B. easier to bend into shape than pure metal
- C. cheap
- D. a good conductor of heat
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20. A bicycle chain is made of steel.
Lubricating a steel bicycle chain with oil prevents corrosion of the chain by … |
Dorothy Castillo | Pexels.com |
- A. making the chain run more smoothly
- B. oil reacting with air so protecting the steel
- C. excluding water from the chain
- D. excluding carbon dioxide from the chain
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