Module 2: Written feedback - PGCE

Handout 4.2.3 cont.
The teacher’s comments are transcribed below:
Well done, Fiona – an excellent explanation about the diffusion of bromine and air. Look at your particle
diagram for liquids – how do you think the diffusion would have been different if we had used two liquids?
Why do you think diffusion does not happen in a solid?
If you are unsure about either of these questions, come and see me and we can talk about it.
Well done, Fiona – you really have a good idea about how the particles got more energy when we heated
the can. But, why did this blow the lid off? Let’s see if you can fill in the gaps along the way … .
What happened to the movement of the air particles as you heated the air?
Why do faster moving particles put more force on the lid of the can?
(There are two reasons. Can you get them both? – a credit if you can!)
If you are unsure about these questions, come and see me and we can talk about it.
(John F. Kennedy School, Hertfordshire)
29 Unit 4, Module 2: Written feedback © Crown copyright 2004