Fermentation
Chemistry: AQA GCSE Higher, topic 7.2.8
Fermentation
Fermentation is a common method for producing ethanol. Ethanol is a key part of alcoholic drinks.
Process
- The process of fermentation involves adding yeast to a sugar solution. The resulting reaction gives:
- An aqueous solution of ethanol.
- Carbon dioxide.
Conditions
- The ideal conditions for the fermentation of sugar using yeast are:
- A temperature of 37°C.
- A solution that is slightly acidic.
- In the absence of oxygen (anaerobic).
Test yourself on Fermentation
What is fermentation a common method for producing?
What condition is not ideal for the fermentation of sugar using yeast?
A student leaves a flask of sugar solution and yeast open to the air while it ferments. Which ideal condition for fermentation is this flask failing to provide?
A student keeps a flask of sugar solution and yeast in a fridge at 4°C while it ferments. Which ideal condition for fermentation is this fridge failing to provide?
A sugar solution is kept at 37°C, is slightly acidic, and has no oxygen present. Which substance is still missing for fermentation to take place?