Analysis Questions for Bunsen Burner Lab 1. What is the purpose of the air holes, the needle valve and the barrel? 2. Which cone gives more heat? Where is the hottest flame and why? 3. How does a striker work? 4. Compare the flames for heating purposes. 5. What is the purpose of the gas jet? 6. How do you adjust the bunsen burner for a luminous flame? 7. How do you adjust the bunsen burner for a nonluminous flame?