Physics 0625 · IGCSE · Kinetic particle model of matter
Kinetic particle model of matter — practice question
Fig. 4.1 depicts the apparatus used to study the motion of smoke particles (Brownian motion). The diagram labels are: microscope, glass cover, glass cell, smoke.
(a(i))[2]
Draw the route of one of the bright specks of light.
(a(ii))[4]
Explain, in terms of forces and the motion of air molecules, what causes the smoke particles to move.
(b(i))[1]
Explain, in molecular terms, why the air’s internal energy increases.
(b(ii))[2]
Explain, in terms of molecules, why the air pressure also rises.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Zig-zag / random direction changes” …