Technicraft - Fair Test!

This Thursday at Technicraft we were doing a fair test with different types of bubbles made from different solutions! This is how to do it…

Ingredients and Equipment:

1. 500ml water
2. 100ml detergent
3. 10ml glucose
4. 10ml glycerine
5. 10ml sugar
6. 10ml salt
7. Beaker
8. 5 plastic cups
9. 5 straws
10. Labels on each cup

Method:

1. Label each individual cup with an individual substance: detergent, glucose, sugar, salt and glycerine.
2. Put one straw in each cup.
3. Add 20 ml detergent in each cup.
4. Add 100 ml water in each cup.
5. Add 10 ml of each substance labelled on the cups.
6. Wet a flat surface.
7. Carefully making sure you don’t mix them you blow a bubble with each different solution.
8. Blow the bubbles one by one and do 3 tests on each solution.
9. See which one lasts longer.

Hypothesis:

I think that the glycerine will last the longest because it is heavier than the other substances providing it more protection for the bubble.

1st Place: Glycerine

2nd Place: Glucose

3rd Place: Sugar

4th Place: Detergent

5th Place: Salt

Explanation:

The glycerine bubble lasted the longest because it was more heavy, syrupy and viscous than the other substances. Since the glycerine was heavy it strengthened and supported the detergent making the dehydration and evaporation process delay.

The salt bubble didn’t last very long. It lasted less than a second before it dehydrated and evaporated. This is because when salt is applied to detergent the salt’s sodium turns the water into hard water. When the hard water comes in contact with detergent the hard water lessens the effectiveness of the detergent speeding up the dehydration and evaporation process.

Walht: write an explanation using the words of science.