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Alcohol
Prepare and show the production of alcohol by yeast
Question | Answer |
---|---|
What substrate is used in the production of yeast? | Glucose |
The Glucose is broken down into alcohol using.... | yeast |
This type of respiration is called... | Anaerobic |
The control in this investigation is a ... | flask with glucose solution only |
The purpose of the fermentation lock is... | to ensure anaerobic conditions develop within the flask |
Name the liquid placed in the fermentation lock | water or limewater |
At which temperature does the reaction take place? | 30 degrees celsius |
Which gas is produced as the investigation proceeds? | Carbon Dioxide |
What effect does the gas produced have on limewater? | It changes from clear to milky white |
Why is the product filtered? | To remove the yeast |
Name the two chemicals used to test for alcohol. | Potassium iodide and sodium hypochlorite |
what colour is produced when the test chemicals are mixed? | Brown |
what temperature is needed to get a positive result? | 60 degrees celsius |
a positive test for alcohol is indicated by the formation of | a yellow precipitate |
Yeast belongs to which kingdom | Fungi |
Fermentation stops when | The alcohol concentration rises and poisons the yeast |
Other than free yeast what other type of yeast can be used in this investigation? | Immobilised yeast |
Alcohol which comes in contact with bacteria in the air is broken down into... | vinegar |