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
11–20 of 991
Question 11
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 12
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 13
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 14
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 15
2 marks · Normal
Answer and see the solution →State the arrangement and movement of particles in a liquid.
Question 16
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 17
2 marks · Hard
Answer and see the solution →Describe one way in which the arrangement of particles in a liquid differs from that in a gas, and one way the movement of the particles differs.
Question 18
5 marks · Hard
Answer and see the solution →The diagram shows three containers, each containing a different state of a substance at the same temperature.
Diagram representing solids, liquids, and gases (not to scale). (a)[1 mark]Give the letter for the container that shows the correct particle arrangement for a solid.
(b)[1 mark]Describe the movement of the particles in the container you identified in part (a).
(c)[2 marks]Explain, using the particle model, why the arrangement of particles in a gas allows a gas to fill any container.
(d)[1 mark]State one reason, based on particle movement, why liquids can flow but solids cannot.
Question 19
2 marks · Hard
Answer and see the solution →Explain, using the particle model, why solids have a fixed shape and gases do not.
Question 20
1 mark · Easy
Answer and see the solution →State what happens to the movement of particles when a solid is heated until it becomes a liquid.