Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
What would happen with non-electrolytes?
19 practice questions
Practice questions
1–10 of 19
Question 1
1 mark · Easy
Answer and see the solution →State what you would observe if you tested solid sucrose (sugar) for electrical conductivity using an electric circuit with a bulb.
Question 2
3 marks · Easy
Answer and see the solution →A student investigates the conductivity of three white solids: sodium chloride, glucose, and wax. She sets up the following experiment:
Simple circuit for testing conductivity of solids (a)[1 mark]Sodium chloride does not conduct electricity as a solid, but the bulb lights up when it is dissolved in water. What does this indicate about sodium chloride?
(b)[1 mark]Glucose does not conduct electricity, whether solid or dissolved in water. What type of substance is glucose?
(c)[1 mark]Wax does not conduct electricity as a solid or when melted. What does this suggest about wax?
Question 3
2 marks · Easy
Answer and see the solution →Explain why sodium chloride conducts electricity when molten, but not as a solid.
Question 4
3 marks · Easy
Answer and see the solution →A student tests three substances for their ability to conduct electricity when solid and when dissolved in water. The results are shown in the table.
Conductivity results Substance Conducts as a solid? Conducts dissolved in water? A (potassium bromide) No Yes B (ethanol) No No C (magnesium) Yes n/a (a)[2 marks]Identify substances A, B, and C as ionic, covalent, or metallic.
(b)[1 mark]Which substance is a non-electrolyte?
Question 5
1 mark · Easy
Answer and see the solution →Name a common non-electrolyte used in food and explain why it does not conduct electricity.
Question 6
3 marks · Easy
Answer and see the solution →The table gives the results for the electrical conductivity of three substances in different states:
Conductivity results for different substances Substance Solid Molten Aqueous D No Yes Yes E No No No F Yes Yes n/a (a)[1 mark]Which substance is a non-electrolyte? Explain your answer.
(b)[1 mark]What type of bonding does substance D have? Explain using the data.
(c)[1 mark]State the bonding present in substance F.
Question 7
2 marks · Easy
Answer and see the solution →A student tests solid sodium chloride and sugar for electrical conductivity. She finds that only molten sodium chloride conducts electricity, while sugar does not conduct electricity when molten or in solution.
State, with a reason, whether each substance is ionic, covalent, or a non-electrolyte.
(a)[1 mark]Sodium chloride:
(b)[1 mark]Sugar:
Question 8
2 marks · Easy
Answer and see the solution →The results of an experiment are shown below:
Conductivity Results Substance State Tested Conducts Electricity? Magnesium chloride Solid No Magnesium chloride Molten Yes Ethanol Liquid No Identify whether each substance is ionic, covalent, or a non-electrolyte. Give a reason for your answer in each case.
(a)[1 mark]Magnesium chloride:
(b)[1 mark]Ethanol:
Question 9
2 marks · Normal
Answer and see the solution →A student wants to know whether glucose (C6H12O6) is an electrolyte, an ionic compound, or a covalent compound. They attempt to pass an electric current through both solid glucose and glucose dissolved in water, but the bulb does not light up in either case.
State what type of substance glucose is and give a reason based on the results of the experiment.
Question 10
4 marks · Normal
Answer and see the solution →Two students investigate the ability of different substances to conduct electricity using the apparatus below.
(a)[2 marks]Complete the table below by identifying whether each substance is likely to conduct electricity or not in the form stated.
Substance State Will it conduct electricity? (Yes/No) Sodium chloride Molten Sucrose (C12H22O11) Aqueous solution (b)[2 marks]Explain why one of these substances does not conduct electricity in the given state.