Required Practical: Food Tests (OCR GCSE Biology A (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
What colour change indicates a positive result in Benedict's test for reducing sugars?
What colour change indicates a positive result in Benedict's test for reducing sugars?
Blue to 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 the test tube be heated in Benedict's test?
How long should the test tube be heated in Benedict's test?
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 for proteins?
What colour indicates a positive result in the Biuret test for proteins?
Purple
What two chemicals make up Biuret solution?
What two chemicals make up Biuret solution?
Sodium hydroxide and copper(II) sulfate
What forms when lipids are present in the emulsion test?
What forms when lipids are present in the emulsion test?
Cloudy white emulsion
How much ethanol is added in the emulsion test for lipids?
How much ethanol is added in the emulsion test for lipids?
2 cm³
What indicates lipids are present in the Sudan III test?
What indicates lipids are present in the Sudan III test?
Red-stained oil layer on surface
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 safety equipment is needed when handling the hot water bath in Benedict's test?
What safety equipment is needed when handling the hot water bath in Benedict's test?
Safety goggles