Yeast in anaerobic respiration Flashcards
1
Q
Why is the water boiled?
A
To drive off any air that is dissolved in the water.
2
Q
What is added to the water once it has cooled?
A
Small amount of sugar and then yeast.
3
Q
What is layered on top of the mixture and why?
A
Liquid paraffin is added to stop any oxygen diffusing in from the air.
4
Q
What can be observed throughout the experiment?
A
Bubbles
5
Q
What can be used to prove the gas given off is a CO2 and how will you know?
A
Lime water –>clear to cloudy.
Hydrogen Carbonate indicator –> Orange to Yellow.
6
Q
What smell should be given off at the end of the experiment?
A
A alcoholic scent.
