Science Practical 3

FLAMES

In the previous practical, we discussed about the yellow and blue flames. In this practical, we will go more in-depth on the details of these 2 flames. The yellow flame is a luminous flame, while the blue flame is the non-luminous flame. 

Now, we shall discuss the differences between the two flames.

	Luminous Flame	Non-Luminous Flame
Colour of flame:	Yellow	Blue
Steadiness of flame:	Steady	Unsteady
Visibility of the flame:                (10 steps away from flame)	Visible	Not visible
Observation when holding an ice-cream stick over the flame and moving it up and down about ten times:	Ice-cream stick burns slower	Ice-cream stick burns/catches fire quickly
Temperature of flame:	No	Much hotter than luminous flame

Part 2 of the lesson:

For the next part of the lesson, we learnt to heat a substance(water) in a test tube.

1. Carefully pour water into the test tube until to a depth of 2cm.

2. Add a drop of food colouring to the water in the test tube to make it more visible.

3. Light the bunsen burner with the way you learnt how to in the previous practical and heat the test tube gently over the non-luminous flame.

4. When the water starts  boiling, turn off the gas tap.

5. Place the test tube back in the test tube rack(hold the top of the test tube to prevent being scalded).

6. Leave the test tube to cool before removing the contents.  

*Always wear safety goggles when heating substances*

*Do not hold the test tube in your hand as it might slip and break*