This photograph shows the lighting of the bunsen flame. Complete the blanks in these sentences. Each blank is worth 1 mark and in all the two questions are worth 5 marks.

1. The air hole of the _____________ burner must be ____________ before _________ the bunsen burner.
2. This can be confirmed because the flame is colored ____________ now and can be easily SEEN by everyone working in the room. This would prevent anyone getting ________ if they accidentally move close to the flame.