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
771–780 of 991
Question 771
2 marks · Normal
Answer and see the solution →Calcium metal has a giant structure.
Draw and clearly label a simple 2D diagram to show the arrangement of ions and delocalised electrons in calcium metal.
Question 772
4 marks · Normal
Answer and see the solution →Read the paragraph and answer the questions.
Solid metals consist of positive metal ions in a sea of delocalised electrons. The bonding involves the electrostatic attraction between the ions and the electrons.
(a)[1 mark]Define metallic bonding.
(b)[1 mark]State what particles are involved in metallic bonding.
(c)[2 marks]Explain how metallic bonding holds the metal together.
Question 773
2 marks · Hard
Answer and see the solution →Explain, in terms of electrostatic forces, how metallic bonding holds a pure metal such as aluminium together. Your answer should refer specifically to the particles involved.
Question 774
5 marks · Hard
Answer and see the solution →Zinc is used to galvanise iron to prevent rusting because it is strong and resistant. Answer the following about the properties of zinc metal and its bonding.
(a)[2 marks]State and explain, in terms of metallic bonding, why zinc conducts electricity.
(b)[2 marks]Zinc can be hammered into thin sheets. Explain why this is possible, referring to its structure and bonding.
(c)[1 mark]Zinc has a high melting point. Explain this property in terms of attraction between its particles.
Question 775
2 marks · Hard
Answer and see the solution →Draw a simple 2D diagram to represent the arrangement of particles in a piece of barium metal. Clearly label the positive ions and the sea of delocalised electrons.
Question 776
1 mark · Easy
Answer and see the solution →State whether solid potassium nitrate conducts electricity. Give your answer as 'yes' or 'no'.
Question 777
3 marks · Easy
Answer and see the solution →The table shows the state of three substances at room temperature:
(a)Substance State Calcium bromide Solid Ethanol Liquid Magnesium sulfate (aq) Solution (i)[1 mark]Which one of these substances is most likely to conduct electricity? State your answer.
(ii)[1 mark]State the type of particles that must be present and able to move for conduction to occur in this substance.
(iii)[1 mark]Explain why the other two substances do not conduct electricity at room temperature.
Question 778
2 marks · Easy
Answer and see the solution →Explain why molten potassium iodide conducts electricity, but solid potassium iodide does not.
Question 779
3 marks · Easy
Answer and see the solution →A student tests four different substances for electrical conductivity in different states. The results are shown below:
(a)Substance State Conducts electricity? Lead bromide Molten Yes Sucrose Solid No Potassium nitrate Aqueous solution Yes Silicon dioxide Solid No (i)[1 mark]Identify which substance is a covalent compound and give evidence from the table for your answer.
(ii)[1 mark]State the common feature of all the substances that do conduct electricity in this test.
(iii)[1 mark]Suggest why silicon dioxide does not conduct electricity.
Question 780
1 mark · Easy
Answer and see the solution →Does liquid ethanol conduct electricity? Answer 'yes' or 'no'.