Question

Study the flame shown below.

1. Name the type of flame shown above
2. Label the regions A, B and C.
3. Which region is the hottest?
4. State two reasons why the above flame is preferred for heating.
5. State the condition under which the above flame is produced.

Answer 1

1. Name the type of flame shown above. 
   Non-luminous flame
    
2. Label the regions A, B and C. (3mks)
   A – pale blue region
   B – Greenish blue region
   C – Almost colourless region.
    
3. Which region is the hottest? (1mk)
   A
    
4. State two reasons why the above flame is preferred for heating. (2mks)
   It’s very hot
   Does not produce soot.
    
5. State the condition under which the above flame is produced. (1mk)
   When the air hole is open.