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Edexcel IGCSE Physics (c) Change of state Question Bank

Practise change of state through particle models, heating and cooling graphs, specific heat capacity calculations and practical measurements.

Syllabus
First assessment 2019
Course
Physics 4PH1

Exam points

  • interpret temperature-time graphs to locate melting, freezing or boiling plateaus
  • explain particle arrangement, motion and kinetic store changes during heating and state change
  • calculate energy, mass or temperature change using specific heat capacity data

Covered syllabus points

5.8P Heating and energy stores5.9P Melting, evaporation and boiling5.10P Particle arrangement and motion5.11P Change of state practical5.12P Specific heat capacity5.13P Thermal energy equation5.14P Specific heat capacity practical

(c) Change of state question 1

[Maximum number: 1]

Photograph 1 shows an outdoor swimming pool.

Photograph 1

Photograph 1

The water in the swimming pool is heated by the Sun during the day.

State what happens to the average speed of the water molecules as the water is heated.

(c) Change of state question 2

[Maximum number: 6]

This question is about liquid nitrogen.

Question (a)

(a)

The diagram shows the arrangement of particles in solid nitrogen.

Draw the arrangement of particles in liquid nitrogen.

solid

solid

liquid

liquid

[ 2 ]

Question (b)

(b)

Describe the motion of the particles in liquid nitrogen.

[ 1 ]

Question (c)

(c)

Over time, the liquid nitrogen warms up and changes state from a liquid into a gas.

Describe the changes to the arrangement and motion of particles when the liquid nitrogen changes state.

[ 3 ]

(c) Change of state question 3

[Maximum number: 2]

This question is about sound waves.

The speed of sound in liquids is greater than the speed of sound in gases.

Describe the arrangement of particles in liquids and in gases.

You may use diagrams to help your answer.

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