Ngā Whāinga Ako ^🔗

I can use a Bunsen burner safely and explain how it works.

Safety / Haumaru ^🔗

• The location of the lab fire extinguisher is known
• Safety glasses are worn
• Long hair is tied back and close clothing items tucked away
• The Bunsen burner is placed on a heat resistant surface
• The Bunsen burner is not too close to the edge of the desk

• The rubber tubing is checked for cracks or leaks
• The Bunsen is connected to the gas tap correctly
• The air hole on the Bunsen is closed (safety flame)
• The student can adjust the flame correctly

Pātai: Explain ^🔗

1. Why is the flame yellow when the air hole is closed?
2. Why does the flame get hotter and change colour when the hole is gradually opened?
3. What flame should be used when the Bunsen burner is not in use (orange or blue)?
4. Why should that flame be used?

Whakatika ^🔗

1. Why is the flame yellow when the air hole is closed?
   Closing the hole limits the oxygen available, this makes the flame orange (cooler).
2. Why does the flame get hotter and change colour when the hole is gradually opened?
   Opening the hole allows more oxygen to mix with the gas. This allows it to burn hotter (blue).

3. What flame should be used when the Bunsen burner is not in use (orange or blue)?
   Orange.
4. Why should that flame be used?
   It is more visible and not as hot. You are less likely to burn yourself, and any burns will be less severe!

Task / Ngohe ^🔗

1. Collect a sheet from the front of the class
2. Glue it into your book
3. Write the numbers 1-7 next to the steps in the correct order!

Game / Tākaro ^🔗

Get out your device and open Kahoot!