States of Matter
5 marks · EasyThe diagram below shows particles of a substance in three different boxes, labelled 1 (A), 2 (B), and 3 (C).
Each diagram represents a different state of matter at room temperature.
Match each box (1, 2, or 3) to the correct state: solid, liquid, or gas.
Describe the arrangement of the particles in box 2.
State what process will occur if the substance in box 1 is heated strongly, and name the state formed.
Describe, using particle theory, what happens to the movement of the particles during this process.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) 1 = solid, 2 = liquid, 3 = gas
(b) Particles in box 2 are randomly arranged and mostly touching but have some gaps.
(c) Melting will occur; the solid changes to a liquid.
(d) Particles gain energy and begin to move around each other, no longer just vibrating in place.
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correctly matches boxes to solid, liquid, gas.
B1 (b) · 1 mark · States arrangement is random, mostly touching, with some gaps.
B1 (c) · 1 mark · Names melting and states liquid is formed.
M1 (d) · 1 mark · States particles gain energy and start to move around each other.
A1 (d) · 1 mark · States they move more freely than when in a solid (no longer just vibrating).
Worked solution
a) 1 = solid; 2 = liquid; 3 = gas.
b) In box 2, the particles are randomly arranged and mostly touching, but with some gaps.
c) If you heat box 1, melting will occur and the solid changes to a liquid.
d) The particles gain energy, begin to move around each other, and are no longer only vibrating about fixed positions.