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
41–50 of 407 · Easy
Question 41
5 marks · Easy
Answer and see the solution →The diagram below shows particles of a substance in three different boxes, labelled 1 (A), 2 (B), and 3 (C).
Diagrams of particle arrangements in three states. Each diagram represents a different state of matter at room temperature.
(a)[1 mark]Match each box (1, 2, or 3) to the correct state: solid, liquid, or gas.
(b)[1 mark]Describe the arrangement of the particles in box 2.
(c)[1 mark]State what process will occur if the substance in box 1 is heated strongly, and name the state formed.
(d)[2 marks]Describe, using particle theory, what happens to the movement of the particles during this process.
Question 42
5 marks · Easy
Answer and see the solution →A student leaves a dish of water on a sunny windowsill. After a day, most of the water is gone.
(a)[1 mark]State the process that has occurred to the water.
(b)[1 mark]Describe the arrangement of water particles in the liquid state.
(c)[2 marks]Explain, using particle theory, how the process in (a) happens.
(d)[1 mark]Name the new arrangement and movement of the water particles after the process has finished.
Question 43
1 mark · Easy
Answer and see the solution →State whether sodium chloride (table salt) is an element, a compound, or a mixture.
Question 44
3 marks · Easy
Answer and see the solution →The table below shows the melting points of three samples. Use the data to answer the questions.
Melting points of three substances Sample Melting point (°C) A 801 B 112–130 C 0 (a)[1 mark]Which sample is a pure substance? Explain your answer.
(b)[1 mark]State what the melting range in sample B tells you about its purity.
(c)[1 mark]The boiling point of sample C is 100°C. Is C most likely a pure substance or a mixture? Give a reason.
Question 45
2 marks · Easy
Answer and see the solution →Explain why a mixture of ethanol and water does not have a sharp boiling point.
Question 46
3 marks · Easy
Answer and see the solution →Classify each substance in the table as an element, a compound, or a mixture.
Classification of substances Substance Classification Argon Sea water Ammonia (NH₃) Question 47
1 mark · Easy
Answer and see the solution →State what you would observe about the melting behaviour of a pure substance.
Question 48
3 marks · Easy
Answer and see the solution →A student has the following substances:
Substance Description Hydrogen Colourless gas, only one kind of atom Calcium oxide Solid, contains calcium and oxygen chemically combined Air Mixture of different gases (a)[1 mark]Which substance is an element? Explain your answer.
(b)[1 mark]Which substance is a compound? State its chemical formula.
(c)[1 mark]Why is air described as a mixture?
Question 49
2 marks · Easy
Answer and see the solution →A liquid mixture has a boiling range from 83°C to 97°C. Calculate the difference in temperature across its boiling range.
Question 50
2 marks · Easy
Answer and see the solution →A sealed container holds 36 g of water and 12 g of oxygen gas. Calculate the total mass of compound present and the total mass of element present in the container. Identify which substance is a compound and which is an element.