Question 30
Put on your safety goggles. Your teacher will demonstrate how to use a Bunsen burner. Notice that the burner produces two different coloured flames. This depends on how much air enters the valve, which controls the flow of air in the Bunsen burner.
- If the valve is completely open, a non-luminous (blue) flame is produced. This is the hottest flame.
- If the valve is completely closed, a luminous (yellow) flame is produced. This is sometimes called the safety flame. It is the coolest flame.
In pairs, practise adjusting the valve of the Bunsen burner to see the different flames. Use the pictures below to help you.
- If the valve is completely open, a non-luminous (blue) flame is produced. This is the hottest flame.
- If the valve is completely closed, a luminous (yellow) flame is produced. This is sometimes called the safety flame. It is the coolest flame.
In pairs, practise adjusting the valve of the Bunsen burner to see the different flames. Use the pictures below to help you.
