Food Tests: Reagents & Results
A definitive guide to the chemical reagents used to test for carbohydrates, proteins, and lipids in the GCSE required practical.
Which food test requires a water bath?
What is Food Tests: Reagents & Results?
"Food tests are qualitative chemical procedures used to identify the presence of biological molecules like starch, sugar, protein, and lipids."
Which term correctly completes this GCSE Biology equation or calculation statement? A ____ is the total of results ÷ number of results
Which term correctly completes this GCSE Biology equation or calculation statement? ____ change = (final − initial) ÷ initial × 100
Which option correctly completes the statement? In photosynthesis practicals, moving a lamp ____ increases light intensity
Which answer best completes the statement? Control variables are kept the same for a ____ test
Biochemical Reagents
Iodine solution: Tests for starch (positive = blue-black).
Benedict's solution: Tests for reducing sugars (positive = green/yellow/brick-red).
Biuret reagent: Tests for proteins (positive = purple/lilac).
Ethanol emulsion: Tests for lipids (positive = cloudy white layer.
Only the Benedict's test requires a water bath at 80°C; all other tests work at room temperature.
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