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

Question 1 of 12

2. Describe the formation of a covalent bond

Question 2 of 12

3. When are ions attracted to each other?

Question 3 of 12

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

Question 4 of 12

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

Question 5 of 12

6. In the dot and cross diagram of the outer electrons showing the covalent bonding in a molecule of ethene (C₂H₄), how many electrons should be shown in areas 1, 2, 3, 4, and 5?

Question 6 of 12

7. When can ionic substances conduct electricity?

Question 7 of 12

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

Question 8 of 12

9. Explain what is meant by electric current

Question 9 of 12

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

Question 10 of 12

11. How can atoms get a full outer shell?

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