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
321–330 of 407 · Easy
Question 321
3 marks · Easy
Answer and see the solution →The table shows the state of three substances at room temperature:
(a)Substance State Calcium bromide Solid Ethanol Liquid Magnesium sulfate (aq) Solution (i)[1 mark]Which one of these substances is most likely to conduct electricity? State your answer.
(ii)[1 mark]State the type of particles that must be present and able to move for conduction to occur in this substance.
(iii)[1 mark]Explain why the other two substances do not conduct electricity at room temperature.
Question 322
2 marks · Easy
Answer and see the solution →Explain why molten potassium iodide conducts electricity, but solid potassium iodide does not.
Question 323
3 marks · Easy
Answer and see the solution →A student tests four different substances for electrical conductivity in different states. The results are shown below:
(a)Substance State Conducts electricity? Lead bromide Molten Yes Sucrose Solid No Potassium nitrate Aqueous solution Yes Silicon dioxide Solid No (i)[1 mark]Identify which substance is a covalent compound and give evidence from the table for your answer.
(ii)[1 mark]State the common feature of all the substances that do conduct electricity in this test.
(iii)[1 mark]Suggest why silicon dioxide does not conduct electricity.
Question 324
1 mark · Easy
Answer and see the solution →Does liquid ethanol conduct electricity? Answer 'yes' or 'no'.
Question 325
3 marks · Easy
Answer and see the solution →Water is added to solid lithium chloride until it dissolves.
(a)[1 mark]Predict whether lithium chloride solution conducts electricity.
(b)[2 marks]Explain why your answer is correct in terms of particle movement.
Question 326
1 mark · Easy
Answer and see the solution →State the name of the liquid or solution that undergoes electrolysis and contains ions.
Question 327
3 marks · Easy
Answer and see the solution →The diagram shows an apparatus for electrolysis.
(a)[1 mark]Name the positively charged electrode.
(b)[1 mark]Name the negatively charged electrode.
(c)[1 mark]Give the term for the solution or molten compound that contains ions in this process.
Question 328
2 marks · Easy
Answer and see the solution →How many positive ions and how many negative ions are present in the formula unit of magnesium bromide ()? State the name for each type of ion.
Question 329
2 marks · Easy
Answer and see the solution →Describe how you could investigate whether molten lead(II) bromide conducts electricity. Explain the observation that would show conduction is occurring.
Question 330
3 marks · Easy
Answer and see the solution →The table shows the roles of electrodes and ions in electrolysis of sodium bromide solution.
(a)[0 marks]Part Type Charge Electrode A Electrode B Na^+ ion Br^- ion (b)[3 marks]Complete the table by naming the type (anode/cathode/cation/anion) and the charge (+/–) for each part.