Dissolve a teaspoon of sugar in a glass of dried fruit compote. Dilute a teaspoon of baker’s yeast in it. Take a 20 ml disposable syringe. While drawing in the mixture, fill the syringe. Fasten it vertically, piston upwards in a warm room. After a few hours, measure the volume of the gas bubble by the graduation of the syringe. Suggest a way to measure the rate of gas addition in the syringe. What gas do you think yeast gives off?
Yeast gives off carbon dioxide. To determine the rate of gas formation, you can note the time of raising the piston by 1 one division (1 ml), calculate the rate: divide the number of ml by the time. And you can measure the amount of gas rise in cm and also divided by time.
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