Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Giant ionic structures
19 practice questions
Practice questions
1–8 of 8 · Easy
Question 1
1 mark · Easy
Answer and see the solution →State whether giant ionic compounds have high or low melting points.
Question 2
3 marks · Easy
Answer and see the solution →Magnesium fluoride (MgF_2) is an ionic compound with a giant ionic lattice.
(a)[1 mark]State the type of structure present in magnesium fluoride.
(b)[2 marks]Explain why magnesium fluoride does not conduct electricity when solid.
Question 3
2 marks · Easy
Answer and see the solution →Potassium oxide (K_2O) is an ionic compound formed from K^+ and O^{2-} ions.
Calculate the total positive charge provided by the potassium ions in one formula unit of potassium oxide.
Question 4
2 marks · Easy
Answer and see the solution →Explain why the melting point of sodium oxide (Na_2O) is higher than that of sodium chloride (NaCl).
Question 5
3 marks · Easy
Answer and see the solution →The table shows properties of two substances.
Properties of sodium fluoride and phosphorus trichloride Substance Melting point (°C) Electrical conductivity (solid) Electrical conductivity (liquid) Sodium fluoride (NaF) 998 No Yes Phosphorus trichloride (PCl_3 -112 No No (a)[1 mark]Which substance has a giant ionic structure?
(b)[1 mark]State one piece of evidence from the table that supports your answer in (a).
(c)[1 mark]Explain why sodium fluoride conducts electricity when molten but not when solid.
Question 6
1 mark · Easy
Answer and see the solution →Name the forces that hold the ions together in a giant ionic lattice.
Question 7
3 marks · Easy
Answer and see the solution →Barium chloride (BaCl_2) is an ionic compound.
(a)[1 mark]Name the ions present in barium chloride.
(b)[1 mark]State one property of barium chloride that is linked to its structure.
(c)[1 mark]Explain how the structure of barium chloride leads to this property.
Question 8
2 marks · Easy
Answer and see the solution →Lithium oxide (Li_2O) is an ionic compound formed from lithium ions (Li^+) and oxide ions (O^{2-}).
How many electrons in total are transferred from lithium atoms to oxygen atoms to form one formula unit of lithium oxide? Show your working.