1. What is needed to complete this diagram to show the ionic bonding in potassium oxide, K₂O ?

Question 1 of 12

2. Describe the formation of a covalent bond

Question 2 of 12

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

Question 3 of 12

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

Question 4 of 12

5. Do ionic substances conduct electricity?

Question 5 of 12

6. 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 6 of 12

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

Question 7 of 12

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

Question 8 of 12

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

Question 9 of 12

10. State the fomula for the two ions in iron (II) sulfide

Question 10 of 12

11. Do larger molecules have higher or lower boiling points than smaller molecules?

Question 11 of 12

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

Question 12 of 12