Required Practical: Food Tests (AQA GCSE Biology): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
Which reagent is used to test for reducing sugars?
Which reagent is used to test for reducing sugars?
Benedict's solution
What colour change indicates a positive Benedict's test?
What colour change indicates a positive Benedict's test?
Blue to brick-red or orange
At what temperature should the Benedict's test be carried out?
At what temperature should the Benedict's test be carried out?
Around 75°C
How long should the Benedict's test be heated for?
How long should the Benedict's test be heated for?
5 minutes
Which solution is used to test for starch?
Which solution is used to test for starch?
Iodine solution
What colour change indicates starch is present?
What colour change indicates starch is present?
Brown to blue-black
What does Biuret solution test for?
What does Biuret solution test for?
Proteins
What colour indicates a positive Biuret test?
What colour indicates a positive Biuret test?
Purple
What indicates lipids are present in the emulsion test?
What indicates lipids are present in the emulsion test?
Cloudy white emulsion
What is the positive result for the Sudan III lipid test?
What is the positive result for the Sudan III lipid test?
Red-stained oil layer
Why must ethanol be handled carefully during the lipid test?
Why must ethanol be handled carefully during the lipid test?
It is highly flammable
What is added first in the emulsion test for lipids?
What is added first in the emulsion test for lipids?
Ethanol