1. Why do ionic compounds conduct electricity only when molten or in solution?

Question 1 of 20

2. What is an alloy?

Question 2 of 20

3. A student has drawn a diagram to show the structure of a metallic solid, but forgotten to label the parts. Which of the following correctly lists those parts?

Question 3 of 20

4. What is needed to complete this diagram to show the ionic bonding in magnesium chloride, MgCl₂ ?

Question 4 of 20

5. State 2 properties that makes aluminium suitable for manufacturing aircraft

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6. Why is the boiling point of a larger molecule higher than that of a smaller molecule?

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7. Why do metals have high melting and boiling points?

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8. Describe the bonding in a metal

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9. Explain, in terms of its structure, why graphite can act as a lubricant.

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10. Explain what is meant by electric current

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11. What holds ions together?

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12. In the dot and cross diagram of the outer electrons showing the covalent bonding in a molecule of nitrogen (N₂), how many electrons should be shown in areas 1, 2 and 3?

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13. Why are alloys harder than pure metals?

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14. Suggest why buckminsterfullerene, C₆₀, has a low melting point.

Question 14 of 20

15. Explain, in terms of structure and bonding, why magnesium oxide has a higher melting point than sodium chloride

Question 15 of 20

16. Give the definition of a covalent bond

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17. Describe the formation of a covalent bond

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18. Do ionic substances conduct electricity?

Question 18 of 20

19.

State whether covalent substances conduct electricity, and explain why

Question 19 of 20

20. Explain why methane gas, CH₄, is a gas at room temperature

Question 20 of 20