GCSE Biology - Food Tests Practicals (2026/27 exams) скачать в хорошем качестве

GCSE Biology - Food Tests Practicals (2026/27 exams)

⭐️ Check out our website https://www.cognito.org/ ⭐️ ** WHAT'S COVERED ** 1. Preparing a food sample for testing Grinding the food Dissolving in distilled water Filtering the solution 2. Benedict's test for sugars Testing for reducing sugars Using a water bath Observing colour changes (blue to green/yellow/brick-red) 3. Iodine test for starch Adding iodine solution Observing colour change (browny-orange to blue-black) 4. Biuret test for proteins Adding Biuret solution (or potassium hydroxide and copper sulfate for Edexcel) Observing colour change (blue to pink/purple) 5. Sudan III test for lipids Adding Sudan III stain solution Observing the formation of a red-stained top layer 6. Emulsion test for lipids (Edexcel specific) Adding ethanol and shaking Adding distilled water Observing a cloudy white colour (emulsion) ** CHAPTERS ** 0:00 Introduction to Food Tests 0:36 Preparing a Food Sample 1:12 Benedict's Test (Sugars) 2:17 Iodine Test (Starch) 2:56 Biuret Test (Proteins) 3:34 Sudan III Test (Lipids) 4:07 Emulsion Test (Lipids - Edexcel) ** PLAYLISTS **    • GCSE Maths (9-1)      • GCSE Biology (9-1)      • GCSE Chemistry (9-1)      • GCSE Physics (9-1)      • A-Level Biology   #GCSE #Biology #study