1. Do ionic substances conduct electricity?

Question 1 of 12

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

Question 2 of 12

3. Why do ionic substance have high melting and boiling points?

Question 3 of 12

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

Question 4 of 12

5. What holds ions together?

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6. Explain what is meant by electric current

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7. Describe the formation of a covalent bond

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8. 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 8 of 12

9. Explain why Silica, SiO₂ is a solid with a high melting point

Question 9 of 12

10. Explain how the atoms are held together in a hydrogen bromide molecule

Question 10 of 12

11. Explain why nitrogen gas, N₂, is a gas at room temperature

Question 11 of 12

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

Question 12 of 12