Pearson Edexcel International GCSE (9–1) · CHEMISTRY · Chapter
States of Matter
102 practice questions
Topics covered
Practice questions
11–20 of 42 · Easy
Question 11
2 marks · Easy
Answer and see the solution →Carbon dioxide can change directly from a solid to a gas and back again. Explain the names given to each of these two processes.
Question 12
3 marks · Easy
Answer and see the solution →The table below shows the temperature changes as substance X is heated at a steady rate. The melting point of X is 12°C and the boiling point is 65°C.
Time (min) Temperature (°C) 0 5 3 11 6 12 9 30 12 50 15 65 18 70 (a)[1 mark]At what time does substance X start to melt?
(b)[1 mark]At what temperature does X start to boil?
(c)[1 mark]Explain, using particle theory, what happens to the particles of X as it melts.
Question 13
1 mark · Easy
Answer and see the solution →Name the process by which water vapour turns into liquid water.
Question 14
3 marks · Easy
Answer and see the solution →The diagram below represents the arrangement of particles in a solid, a liquid, and a gas.
Particle arrangements in three states of matter. (a)[1 mark]Describe the arrangement of particles in the solid region.
(b)[1 mark]Describe the arrangement of particles in the gas region.
(c)[1 mark]Explain how the differences in particle arrangement relate to the three states of matter.
Question 15
2 marks · Easy
Answer and see the solution →When a solid substance is heated from 10 °C to 70 °C, it melts completely at 50 °C. Use particle theory to calculate the number of changes of state that take place as the temperature increases from 10 °C to 70 °C.
Question 16
2 marks · Easy
Answer and see the solution →Water freezes at 0 °C and boils at 100 °C. Calculate the number of different state interconversion processes that water can undergo in this temperature range. (Name each process as part of your answer.)
Question 17
1 mark · Easy
Answer and see the solution →What is the name given to the process by which the particles of a liquid or gas spread out and mix without stirring?
Question 18
3 marks · Easy
Answer and see the solution →A student places a jar of coloured gas below a jar containing only air and quickly removes the lid between them.
(a)[1 mark]State what will eventually be seen in both jars.
(b)[2 marks]Explain why it takes some time for the colour to spread through both jars, using ideas about particles.
Question 19
2 marks · Easy
Answer and see the solution →At room temperature, particles in a gas travel at about 500 m/s. The laboratory is 6 m long.
Calculate:
(a)[1 mark]How long it would take a particle, travelling in a straight line at this speed, to reach the other end of the laboratory.
(b)[1 mark]Explain why, in reality, it takes much longer for a smell to spread across the laboratory.
Question 20
2 marks · Easy
Answer and see the solution →Explain, using the particle model, why diffusion happens faster in a gas than in a liquid.