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
331–340 of 423 · Normal
Question 331
2 marks · Normal
Answer and see the solution →Explain why solid sodium chloride does not conduct electricity, but sodium chloride solution does.
Question 332
4 marks · Normal
Answer and see the solution →(a)[1 mark]State the type of bonding found in magnesium chloride.
(b)[3 marks]Explain whether magnesium chloride conducts electricity when solid and when dissolved in water.
Question 333
3 marks · Normal
Answer and see the solution →A student wants to test the conductivity of three substances: solid calcium chloride, molten calcium chloride, and pure water.
For each substance, she sets up a circuit and measures the current flowing when a voltage of 6 V is applied.
Substance Current (A) Solid calcium chloride 0.00 Molten calcium chloride 1.45 Pure water 0.00 Calculate the total current measured for the substances that conduct electricity. Show your working.
Question 334
3 marks · Normal
Answer and see the solution →Ammonia, NH3, is a covalent compound. Predict whether ammonia conducts electricity in any state, and explain your reasoning.
Question 335
4 marks · Normal
Answer and see the solution →(a)[2 marks]The table shows the results from testing four substances for electrical conductivity:
Substance State Conducts electricity? Potassium bromide Solid No Potassium bromide Molten Yes Glucose Solution in water No Potassium bromide Solution in water Yes Use the data to identify the substance(s) that conduct electricity and describe the conditions in which conduction occurs.
(b)[2 marks]Suggest a reason why potassium bromide conducts electricity in its molten state and in aqueous solution, but not as a solid.
Question 336
1 mark · Normal
Answer and check →Which statement best explains why sodium chloride solution conducts electricity?
- A.It contains ions that are free to move.
- B.It contains free electrons that carry charge.
- C.It contains molecules that can move around.
- D.It contains atoms that are free to move.
Question 337
4 marks · Normal
Answer and see the solution →(a)[2 marks]Explain why molten zinc chloride can conduct electricity but solid zinc chloride cannot.
(b)[2 marks]Describe what must be present in a substance for it to conduct electricity.
Question 338
2 marks · Normal
Answer and see the solution →Explain why solid sodium chloride does not conduct electricity, but molten sodium chloride does.
Question 339
2 marks · Normal
Answer and see the solution →State the charges of (a) a cation and (b) an anion.
(a)[1 mark]Cation
(b)[1 mark]Anion
Question 340
4 marks · Normal
Answer and see the solution →An experiment is set up to investigate the electrolysis of molten potassium iodide using inert carbon electrodes.
(a)[1 mark]State the name given to the liquid that conducts electricity during electrolysis.
(b)[2 marks]Describe how you would safely set up an experiment to carry out electrolysis on molten potassium iodide, naming the electrodes you would use.
(c)[1 mark]State one safety precaution you should take during this experiment.