Required Practical: Food Tests (OCR GCSE Biology A, Combined (Gateway Science Suite)): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
Which solution is used to test for reducing sugars in food samples?
Which solution is used to test for reducing sugars in food samples?
Benedict's solution
What colour indicates a positive result in Benedict's test for sugars?
What colour indicates a positive result in Benedict's test for sugars?
Brick-red or orange
What temperature should the water bath be for Benedict's test?
What temperature should the water bath be for Benedict's test?
Around 75°C
How long should Benedict's test be heated for?
How long should Benedict's test be heated for?
5 minutes
What colour change indicates starch is present in the iodine test?
What colour change indicates starch is present in the iodine test?
Brown to blue-black
Which nutrient does iodine solution test for?
Which nutrient does iodine solution test for?
Starch
What colour indicates a positive result in the Biuret test?
What colour indicates a positive result in the Biuret test?
Purple
Which nutrient does Biuret solution test for?
Which nutrient does Biuret solution test for?
Protein
Which two liquids are used in the emulsion test for lipids?
Which two liquids are used in the emulsion test for lipids?
Ethanol and distilled water
What indicates a positive result in the emulsion test for lipids?
What indicates a positive result in the emulsion test for lipids?
Cloudy white emulsion
What is the positive result for the Sudan III test for lipids?
What is the positive result for the Sudan III test for lipids?
Red-stained oil layer on surface
Why must ethanol be kept away from open flames during food tests?
Why must ethanol be kept away from open flames during food tests?
It is highly flammable