Required Practical: Food Tests (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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13 cards from this deck
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Practise the cards
13 cards from this deck
Nutrient detected by Benedict's test
Nutrient detected by Benedict's test
Reducing sugars
Benedict's test positive colour change
Benedict's test positive colour change
Blue to brick-red or orange
Benedict's test heating conditions
Benedict's test heating conditions
75°C for 5 minutes in hot water bath
Nutrient detected by iodine test
Nutrient detected by iodine test
Starch
Iodine test positive colour change
Iodine test positive colour change
Brown to blue-black
Nutrient detected by Biuret test
Nutrient detected by Biuret test
Proteins
Biuret test positive colour change
Biuret test positive colour change
Blue to purple
Nutrient detected by emulsion test
Nutrient detected by emulsion test
Lipids
First step in emulsion test for lipids
First step in emulsion test for lipids
Add 2 cm³ ethanol and shake
Second step in emulsion test for lipids
Second step in emulsion test for lipids
Add 2 cm³ distilled water
Emulsion test positive result
Emulsion test positive result
Cloudy white emulsion forms
Nutrient detected by Sudan III test
Nutrient detected by Sudan III test
Lipids
Sudan III test positive result
Sudan III test positive result
Red-stained oil layer forms on surface