Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
Ionic Bonding
143 practice questions
Topics covered
- Ionic bonding in magnesium oxide19 practice questions
- Other examples of ionic bonding19 practice questions
- Calcium chloride19 practice questions
- Formulae for ionic compounds18 practice questions
- Giant ionic structures19 practice questions
- The physical properties of ionic substances19 practice questions
- The electrical conductivity of ionic substances19 practice questions
Practice questions
71–80 of 143
Question 71
2 marks · Normal
Answer and see the solution →Write the formula for these ionic compounds:
(a)[1 mark]sodium phosphate
(b)[1 mark]calcium carbonate
Question 72
4 marks · Normal
Answer and see the solution →For each of the following, state the ions present, their charges, and the correct formula for the compound:
(a)potassium nitrate
(i)[1 mark]State the ions and their charges.
(ii)[1 mark]Write the formula for potassium nitrate.
(b)magnesium chloride
(i)[1 mark]State the ions and their charges.
(ii)[1 mark]Write the formula for magnesium chloride.
Question 73
2 marks · Hard
Answer and see the solution →Iron(III) oxide is an ionic compound formed from Fe3+ and O2– ions. State the correct formula for iron(III) oxide and explain why this is the correct formula.
Question 74
5 marks · Hard
Answer and see the solution →Potassium ions (K+) and phosphate ions (PO4^3–) combine to form an ionic compound.
(a)[2 marks]State the symbol and charge of the potassium ion and the phosphate ion.
(b)[3 marks]Explain, with working, how to deduce the simplest formula for the ionic compound formed from these ions.
Question 75
2 marks · Hard
Answer and see the solution →State the formula for the ionic compound formed between ammonium ions and nitrate ions. Explain your answer.
Question 76
1 mark · Easy
Answer and see the solution →State whether giant ionic compounds have high or low melting points.
Question 77
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 78
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 79
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 80
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.