• Try to find three things which happened which were the same and three things which were different.

• For each difference you find, say how it was different for the two materials.

• You can do the experiment again if you want to.

Pupil responses

In a question like this there are a large number of features which can be observed (both similarities and differences) between the threads as they burn.

Most pupils have little difficulty in making the observations which are relevant to the task. When describing differences, however, they do not always make the comparison between A and B, or if they do, do not make the comparison explicit.