Required practical - Food testing (AQA GCSE Biology Combined Science): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What type of test are food tests?
What type of test are food tests?
Qualitative tests
What colour change shows a positive Benedict's test for reducing sugars?
What colour change shows a positive Benedict's test for reducing sugars?
Blue to green/orange/red
What colour indicates a positive iodine test for starch?
What colour indicates a positive iodine test for starch?
Blue-black
What is a positive result for the Sudan III lipid test?
What is a positive result for the Sudan III lipid test?
Red layer forms on top
What colour change indicates a positive Biuret test for proteins?
What colour change indicates a positive Biuret test for proteins?
Blue to pink or purple
Why should you use a hot water bath instead of a Bunsen burner for food tests?
Why should you use a hot water bath instead of a Bunsen burner for food tests?
It is much safer
How long should you heat the test tube in a hot water bath for Benedict's test?
How long should you heat the test tube in a hot water bath for Benedict's test?
5 minutes
Which reagent is used to test for starch?
Which reagent is used to test for starch?
Iodine solution
Why does Sudan III form a separate layer when lipids are present?
Why does Sudan III form a separate layer when lipids are present?
It dissolves in fats but not water
What is the negative result colour for Benedict's test?
What is the negative result colour for Benedict's test?
Stays blue