HPQ:Chemistry:KS3:Diffusion:AfL Support (Example)

Question

Hydrochloric acid and ammonia were placed either end of a long glass tube and a band of white gas was formed as shown in the diagram below.

Which of the following inferences can be made from these observations:

1. A reaction has taken place
2. Diffusion has taken place
3. A new product has formed
4. Gas particles travel at the same speed at room temperature

Answer

1, 2 and 3