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
781–790 of 991
Question 781
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 782
2 marks · Normal
Answer and see the solution →Explain why solid sodium chloride does not conduct electricity, but sodium chloride solution does.
Question 783
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 784
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 785
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 786
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 787
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 788
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 789
2 marks · Normal
Answer and see the solution →Explain why solid sodium chloride does not conduct electricity, but molten sodium chloride does.
Question 790
2 marks · Hard
Answer and see the solution →Explain why pure, solid silver chloride does not conduct electricity, but when dissolved in water, it does.