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
1–10 of 423 · Normal
Question 1
2 marks · Normal
Answer and see the solution →Describe the movement of particles in a gas compared to the movement of particles in a solid.
Question 2
4 marks · Normal
Answer and see the solution →The table shows some properties of three substances, P, Q and R, at room temperature. Use your knowledge of the arrangement and movement of particles in different states to answer the questions.
Substance Shape Compressibility Flows P Fixed No No Q Not fixed Yes Yes R Not fixed No Yes (a)[3 marks]Identify the state of matter (solid, liquid or gas) for each substance: P, Q and R.
(b)[1 mark]State one difference in particle arrangement between substances P and Q.
Question 3
3 marks · Normal
Answer and see the solution →A block of ice melts to form water. The volume of the ice is 100 cm^3. After melting, the water occupies 95 cm^3. Calculate the change in volume when the state changes from solid to liquid, and explain, using particles, why there is a small decrease in volume.
Question 4
3 marks · Normal
Answer and see the solution →Explain why you cannot walk through a brick wall, but can easily walk through air, using the particle model.
Question 5
4 marks · Normal
Answer and see the solution →A student compares the density and shape of three unknown substances at room temperature. The data are in the table below.
Substance Density (g/cm^3) Shape A 1.0 Fixed B 0.0013 No fixed shape C 0.79 No fixed shape (a)[2 marks]Which substance is most likely to be a liquid at room temperature? Give one reason for your answer.
(b)[2 marks]Using the particle model, explain why substance B can easily be compressed.
Question 6
1 mark · Normal
Answer and check →Which diagram best represents the arrangement of particles in a solid?
A. Particles spaced far apart and moving rapidly
B. Particles close together in a regular pattern, vibrating in place
C. Particles close together in a random arrangement, able to slide past each other
D. Particles far apart, moving only slightly
- A.A. Particles spaced far apart and moving rapidly
- B.B. Particles close together in a regular pattern, vibrating in place
- C.C. Particles close together in a random arrangement, able to slide past each other
- D.D. Particles far apart, moving only slightly
Question 7
2 marks · Normal
Answer and see the solution →State the arrangement and movement of particles in a liquid.
Question 8
4 marks · Normal
Answer and see the solution →The diagram shows three boxes, each containing particles of a different state of matter.
Three boxes drawn with different particle arrangements. (a)[2 marks]Which box (X, Y or Z) most likely contains a gas? Explain your answer.
(b)[2 marks]For the box containing a solid, describe how the particles are arranged and how they move.
Question 9
2 marks · Normal
Answer and see the solution →Explain why the particles in a liquid are able to move past each other, while the particles in a solid cannot.
Question 10
4 marks · Normal
Answer and see the solution →The diagram below shows a substance being heated until it completely changes from solid to gas.
(a)[1 mark]State the name of the process occurring as the solid changes directly to a gas.
(b)[2 marks]Describe what happens to the arrangement and movement of the particles during this process.
(c)[1 mark]Name the reverse process (gas to solid) and give one example of a substance that sublimates.