1. 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 1 of 20

2. Explain why magnesium oxide has a higher melting point than sodium chloride.

Question 2 of 20

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

Question 3 of 20

4.

State whether covalent substances conduct electricity, and explain why

Question 4 of 20

5. If a substance has a simple molecular structure, what physical state might it be at room temperature?

Question 5 of 20

6. Why is the melting point of a smaller molecule lower than that of a larger molecule?

Question 6 of 20

7. Give the definition of a covalent bond

Question 7 of 20

8. A substance is found not to conduct electricity even when molten. What type of bonding does the substance have?

Question 8 of 20

9. State a property that makes iron suitable for building

Question 9 of 20

10. What is an alloy?

Question 10 of 20

11. Explain the term ionic bond

Question 11 of 20

12. Describe the structure of metals

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13. Describe the formation of a covalent bond

Question 13 of 20

14. What is needed to complete this diagram to show the ionic bonding in sodium chloride, NaCl ?

Question 14 of 20

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

Question 15 of 20

16. Do ionic substances conduct electricity?

Question 16 of 20

17. 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?

Question 17 of 20

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

Question 18 of 20

19. Alloys contain different sized positive ions. What properties does this give alloys compared to pure metals?

Question 19 of 20

20. Explain, in terms of its structure, why graphite can conduct electricity.

Question 20 of 20