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
661–670 of 991
Question 661
2 marks · Easy
Answer and see the solution →A student says that ‘solid lead(II) bromide contains charged particles, so it should conduct electricity’. Explain, giving a calculation or statement, why this is incorrect.
Question 662
2 marks · Easy
Answer and see the solution →Explain, in terms of ions, why calcium iodide conducts electricity when molten but not when solid.
Question 663
3 marks · Easy
Answer and see the solution →The table below shows whether four substances conduct electricity in different states.
Electrical conductivity of four substances Substance Solid Molten Aqueous Calcium Bromide No Yes Yes Iron(II) chloride No Yes Yes Sodium phosphate No Yes Yes Iodine No No No (a)[1 mark]From the substances in the table, identify all that are ionic compounds.
(b)[1 mark]What property do these ionic compounds share in relation to conducting electricity?
(c)[1 mark]Explain how the table helped you determine which substances are ionic.
Question 664
1 mark · Easy
Answer and see the solution →State why silver chloride does not conduct electricity in the solid state.
Question 665
3 marks · Easy
Answer and see the solution →Zinc chloride is an ionic compound.
(a)[1 mark]Describe the movement of ions in solid zinc chloride.
(b)[1 mark]Describe the movement of ions in molten zinc chloride.
(c)[1 mark]Explain how movement of ions in the molten state affects electricity conduction.
Question 666
2 marks · Easy
Answer and see the solution →Out of 5 ionic salts, 2 are molten, 1 is in aqueous solution, and the remaining 2 are solid. How many of these salts would you expect to conduct electricity? Show your working.
Question 667
2 marks · Normal
Answer and see the solution →State the conditions under which sodium chloride, an ionic compound, is able to conduct electricity.
Question 668
4 marks · Normal
Answer and see the solution →(a)[2 marks]Calcium fluoride is an ionic compound. State whether it will conduct electricity when in solid form and explain your answer.
(b)[2 marks]Describe the arrangement and movement of ions in solid calcium fluoride.
Question 669
3 marks · Normal
Answer and see the solution →A student is asked to test whether lithium bromide conducts electricity in three different states:
- solid lithium bromide
- molten (melted) lithium bromide
- lithium bromide dissolved in water
Explain, using the idea of moving ions, in which of these states lithium bromide will conduct electricity. Show your reasoning for each case.
Question 670
3 marks · Normal
Answer and see the solution →Copper(II) sulfate is an ionic compound. Predict and explain whether it will conduct electricity in each of these conditions: (a) as a solid (b) when dissolved in water. Give reasons for your answers.