S2.1 The ionic model

What this set covers

Ion formation and ionic compounds: cations and anions, charges from group number, polyatomic ions such as nitrate, ammonium and sulfate, writing formulae, naming iron compounds, and why ionic solids behave as they do.

Common mix-up

Students often assume ionic solids conduct: they do so only when molten or aqueous, because the ions are fixed in the lattice while solid.

Revision tip

Learn the polyatomic ions as a short table, then cover it and write the formulae of aluminium oxide and calcium phosphate by balancing charges.

All 14 questions and answers

1. Ion formed when an atom loses electrons?

   Answer: Cation

2. Charge on the ion formed by a group 16 element?

   Answer: 2−

3. Electrostatic attraction between oppositely charged ions?

   Answer: Ionic bond

4. Repeating three-dimensional arrangement of ions in a solid ionic compound?

   Answer: Lattice

5. Formula of the nitrate ion?

   Answer: NO₃⁻

6. Formula of the ammonium ion?

   Answer: NH₄⁺

7. Formula of the sulfate ion?

   Answer: SO₄²⁻

8. Formula of the hydrogencarbonate ion?

   Answer: HCO₃⁻

9. Formula of aluminium oxide?

   Answer: Al₂O₃

10. Formula of calcium phosphate?

    Answer: Ca₃(PO₄)₂

11. Name of Fe₂O₃?

    Answer: Iron(III) oxide

12. Ionic compounds conduct electricity only when…?

    Answer: Molten or aqueous

13. Ionic compounds have high melting points because of…?

    Answer: Strong electrostatic attractions

14. Of these compounds, which has the strongest ionic bonding?

    Answer: MgO

Play it as a class game

Play this set opens it in splycr, where you can host it for your class straight away. Hosting needs no account: put the room code on the projector, and students join from a phone with the code and their first name. Each question plays as multiple choice, and the three wrong options were written for that question.

• Boss Battle
• Racer
• Kaboom
• Sabotage
• Throne
• Splycr
• Cryo
• Outbreak