Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The electrical conductivity of ionic substances
19 practice questions
Practice questions
1–8 of 8 · Normal
Question 1
2 marks · Normal
Answer and see the solution →State the conditions under which sodium chloride, an ionic compound, is able to conduct electricity.
Question 2
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 3
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 4
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.
Question 5
4 marks · Normal
Answer and see the solution →The table below shows the electrical conductivity of three ionic compounds in solid and molten states.
Substance Conducts when solid? Conducts when molten? Potassium iodide Magnesium oxide Sodium nitrate Complete the table by indicating Yes or No for each box. Then, explain your reasoning for one of your answers.
Question 6
1 mark · Normal
Answer and check →Which of the following best explains why molten potassium bromide conducts electricity?
- A.The ions are free to move and carry charge.
- B.The electrons are free to move between ions.
- C.The molecules are able to gain or lose electrons.
- D.The atoms are bonded together covalently.
Question 7
2 marks · Normal
Answer and see the solution →State two states of ionic substances in which they conduct electricity. For each state, give a reason why conduction is possible.
Question 8
4 marks · Normal
Answer and see the solution →(a)[2 marks]Explain, using particles, why solid magnesium chloride does not conduct electricity.
(b)[2 marks]Describe what changes when magnesium chloride melts and how this allows conduction.