Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Unit
Principles of Chemistry
991 practice questions
Topics covered
- States of Matter102 practice questions
- Elements, Compounds and Mixtures69 practice questions
- Atomic Structure108 practice questions
- The Periodic Table103 practice questions
- Chemical Formulae, Equations and Calculations Part 119 practice questions
- Chemical Formulae, Equations and Calculations Part 2144 practice questions
- Ionic Bonding143 practice questions
- Covalent Bonding68 practice questions
- Metallic Bonding19 practice questions
- Electrolysis198 practice questions
Practice questions
261–270 of 423 · Normal
Question 261
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.
Question 262
3 marks · Normal
Answer and see the solution →Explain how you work out the formula for iron(II) sulfate, using the charges on the ions and their names.
Question 263
4 marks · Normal
Answer and see the solution →The table shows the ions present in four different ionic compounds. Complete the formula for each compound in the table below:
Compound name Ions Formula sodium sulfide Na+, S2– zinc nitrate Zn2+, NO3– aluminium sulfate Al3+, SO4^2– ammonium phosphate NH4+, PO4^3– Question 264
1 mark · Normal
Answer and check →What is the formula for copper(II) nitrate?
- A.Cu(NO3)2
- B.Cu2NO3
- C.CuNO3
- D.(CuNO3)2
Question 265
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 266
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 267
2 marks · Normal
Answer and see the solution →Sodium chloride is an ionic compound with a giant lattice structure.
State TWO properties of sodium chloride that are linked to its giant ionic lattice, and briefly explain why the lattice causes each property.
(a)[2 marks](b)[0 marks]Question 268
4 marks · Normal
Answer and see the solution →Magnesium oxide (MgO) is a typical giant ionic compound.
(a)[1 mark]State the ions present in magnesium oxide.
(b)[2 marks]Explain why magnesium oxide has a very high melting point.
(c)[1 mark]Describe what happens to the ions when solid magnesium oxide melts.
Question 269
3 marks · Normal
Answer and see the solution →Explain why giant ionic structures conduct electricity when molten but do not conduct when solid.
Question 270
4 marks · Normal
Answer and see the solution →The table below gives the melting points and ability to conduct electricity in the solid and molten states for some ionic compounds:
Melting points and conductivity of ionic compounds Compound Melting point (°C) Conducts electricity when solid? Conducts electricity when molten? Sodium chloride 801 No Yes Magnesium oxide 2852 No Yes Potassium bromide 734 No Yes (a)[1 mark]Which compound has the highest melting point?
(b)[2 marks]Suggest a reason why all three compounds do not conduct when solid.
(c)[1 mark]What allows these compounds to conduct when molten?