Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
Formulae for ionic compounds
18 practice questions
Practice questions
1–10 of 18
Question 1
1 mark · Easy
Answer and see the solution →Write the formula for the ionic compound formed between aluminium ions and chloride ions.
Question 2
3 marks · Easy
Answer and see the solution →(a)[1 mark]State the formula of the calcium ion and the oxide ion.
(b)[1 mark]What is the simplest formula for the ionic compound formed from these ions?
(c)[1 mark]Explain why the compound has this formula.
Question 3
2 marks · Easy
Answer and see the solution →Calculate the formula for the ionic compound formed when magnesium ions combine with nitrate ions. Show how the charges are balanced in your answer.
Question 4
2 marks · Easy
Answer and see the solution →Ammonium sulfate has the formula (NH4)2SO4. Explain why two ammonium ions are needed in this compound.
Question 5
1 mark · Easy
Answer and see the solution →State the formula for the ionic compound formed when sodium ions combine with bromide ions.
Question 6
3 marks · Easy
Answer and see the solution →The ions formed by magnesium and sulfur combine to make an ionic compound.
(a)[1 mark]State the symbol and charge of the ion formed by magnesium.
(b)[1 mark]State the symbol and charge of the ion formed by sulfur.
(c)[1 mark]Write the formula for the ionic compound formed from these ions.
Question 7
2 marks · Easy
Answer and see the solution →Calculate the correct formula for the ionic compound made from barium ions and hydroxide ions. Show your working.
Question 8
2 marks · Normal
Answer and see the solution →State the formulae for the following ionic compounds:
(a)[1 mark]potassium sulfide
(b)[1 mark]aluminium nitrate
Question 9
4 marks · Normal
Answer and see the solution →The following ions are present in a solution: Ca2+, OH–, Fe3+, Cl–.
(a)[1 mark]Name the ionic compound formed when Ca2+ reacts with OH–.
(b)[1 mark]Write the formula of the compound formed between Ca2+ and OH–.
(c)[1 mark]Write the formula for the compound formed when Fe3+ reacts with Cl–.
(d)[1 mark]State why brackets are used in the formula for the compound formed between Ca2+ and OH–.
Question 10
3 marks · Normal
Answer and see the solution →Calculate the formula for the ionic compound formed between magnesium ions (Mg2+) and phosphate ions (PO4^3–). Show your working.