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

Question 1 of 12

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

Question 2 of 12

3. How can atoms get a full outer shell?

Question 3 of 12

4. When are ions attracted to each other?

Question 4 of 12

5. When can ionic substances conduct electricity?

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

Question 6 of 12

7. In the dot and cross diagram of the outer electrons showing the covalent bonding in a molecule of chlorine (Cl₂), how many electrons should be shown in areas 1, 2 and 3?

Question 7 of 12

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

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9. Describe the formation of a covalent bond

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

Question 10 of 12

11. Give the definition of a covalent bond

Question 11 of 12

12. Explain why carbon dioxide gas, CO₂, is a gas at room temperature

Question 12 of 12