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Embed code for: Food tests
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State the food tests and the positive results
Describe what qualitative and quantitative data are and how they are different
Explain the results from the practical and identify different substances present in different foods
Starter: can you remember the food tests?
Write them in a table
Colour of liquid at the beginning
What food does it test for?
What colour change occurs?
Reducing Sugars (glucose)
Biuret A and Biuret B potassium hydroxide and copper sulphate
Ethanol and water
Changes in the colour for Benedict’s reagent
Blue to Green to Yellow to Orange to brick redc
Semi – Quantitative
Colour of iodine solution
Colour of Benedict’s reagent
Start of experiment
End of experiment
What does the orangey-brown colour of the iodine show us and why?
What does the colour of the Benedict’s reagent show from the start to the end colour?
The higher the concentration of amylase, the further the Benedict’s reagent has changed colour, what does this mean?
How can we relate the answer to Q3 to number of active sites and rate of reaction?
What happens to the rate of reaction as we increase the enzyme concentration? Draw a graph to show what happens.