Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Section
The electrical conductivity of ionic substances
19 practice questions
Practice questions
11–19 of 19
Question 11
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 12
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 13
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 14
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 15
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 16
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.
Question 17
2 marks · Hard
Answer and see the solution →Explain, in terms of ions, why solid sodium oxide does not conduct electricity.
Question 18
5 marks · Hard
Answer and see the solution →Lead(II) nitrate is an ionic compound. It can be either solid, molten, or dissolved in water.
(a)[2 marks]State whether lead(II) nitrate conducts electricity in each of the following states:
State Does it conduct? (Yes/No) Solid Molten Aqueous solution (b)[3 marks]Explain, in terms of ions, why lead(II) nitrate behaves in this way in these states.
Question 19
2 marks · Hard
Answer and see the solution →State the two conditions under which an ionic compound can conduct electricity.