Diffusion in gases
3 marks · EasyTwo gases, X and Y, are released at opposite ends of a glass tube. After a short time, a white ring forms closer to the end where gas Y was released.
Which gas, X or Y, diffused faster?
Explain why the white ring appears closer to the Y end.
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) Gas X
(b) The white ring forms closer to Y because X diffuses faster, so its particles travel further before meeting Y. X is likely lighter than Y, causing X particles to move at higher speed.
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Identifies X as the faster-diffusing gas.
M1 (b) · 1 mark · Recognises that the faster gas travels further before reacting.
A1 (b) · 1 mark · Explains that faster diffusion is due to lighter particles or greater speed.
Worked solution
a) X b) The ring forms closer to Y because X moves faster than Y and travels further before meeting Y's particles. This happens because X's particles are likely lighter and move more quickly.