Pupil sheet · Diffusion
Diffusion — return questions
Name ______________________ Date ____________
Use one to two weeks after the lessons. Keep the notes and the lesson closed.
1. describe / explain
Keep the lesson closed. A drop of ink is put into a glass of still water. (a) Describe what diffusion is. (b) Use kinetic particle theory to explain why the ink slowly colours all the water. (c) Say what the ink particles are doing once the colour is even all through the glass. (d) Stirring would spread the ink in seconds. Explain why that is not diffusion.
(a) What diffusion is
(b) Why the ink slowly colours all the water
(c) What the ink particles are doing once the colour is even
(d) Why stirring is not diffusion
2. identify / predict / explain
(Supplement) Keep the lesson closed. Gas A has Mr 28 and gas B has Mr 64. Both are at the same temperature. (a) Which gas diffuses faster? Explain, using particles. (b) A and B react to make a white solid. They are let into opposite ends of a long tube at the same moment. Predict where the white ring forms. (c) Released into a still room, each gas ends up spread evenly through it. Explain why.
(a) Which gas diffuses faster, and why
(b) Where the white ring forms
(c) Why each gas ends up spread evenly through the room