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Bench 13 - suggestions to quantify the gas emission

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Bench 13 - suggestions to quantify the gas emission

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1) measure the circumference of the balloon
2) Time taken for the balloon to be in upright position
3) mass of set up at the end of the expt? Will the mass be different?

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After 15 min

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SAcps

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Wellington Pri

Balloon at 16th minute. Reflection: use a standard teaspoon for all groups, specify the quantity, if its flat or heaped.

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XPS- Method to find out the difference in the rate of gas emission

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XPS- Method to find out the difference in the rate of gas emission

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1. Add 1 teaspoon of sugar
2. Add 50 ml of recently boiled water and stir well (70 deg C to 80 deg C will suffice).
3. Add 50 ml tap water to the beaker.
4. Pour the contents into the conical flask with side arm that is attached to a gas syringe.
5. Add 1 teaspoon of yeast and mix well.
6. Place a stopper at the conical flask.

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there will be more gas released with higher concentrations of sugar so repeat the activity with the 3 different amounts of sugar and observe the time taken for the balloon to be fully inflated or compare the inflated balloons after 15 min

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CCPS - Method to measure difference in gas emissions

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CCPS - Method to measure difference in gas emissions

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1. Add 50ml tap water to the beaker
2. Add 50ml recently boiled water to the beaker and stir
3. Add a teaspoon of fresh yeast into the beaker, mix well and wait for 2min
4. While waiting, place a measuring cylinder filled with water upside down into a trough of water.
5. After the 2min, add 1 teaspoon of sugar to the beaker and mix well
6. Pour the mixture from the beaker to a conical flask
7. Seal the top of the conical flask and attach a tube to the conical flask. The other end of the tube should extend to the opening of the upside down measuring cylinder.
8. Wait for 15min
9. After 15min, record the reading on the measuring cylinder.
10.Repeat steps 1 - 9 with 3 teaspoons of sugar

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Time Lapse (15 mins video of Yeast Inflating Balloon)

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Before (0min)/ After (15 mins)
(Realisation. Need to swirl!)

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End

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End

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Before (CCPS)

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Start

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Start

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1. Post your pictures in the column with your respective room number that you are in

2. State your sch name as the heading, e.g. Boon Lay Garden