Chemistry of Nutrition

Science — Second Preparatory

Applications and examples

Comparison aspect	Main idea	Keywords
Experiment 1: starch test.	Put a few drops of starch solution in a test tube and add a few drops of iodine solution. A blue-black colour appears. Repeat the test with distilled water and the colour does not change. This shows that iodine detects starch only	dropssolutiontubeiodine
Experiment 2: fat test.	Put a drop of oil on one sheet of white paper and a drop of water on another. When both dry the oil spot stays translucent and does not disappear while the water spot disappears	dropsheetwhitepaper
Examples of deficiency	a lack of vitamin C causes scurvy the gums bleed. A lack of vitamin D causes rickets in children. A lack of iron causes anaemia. A lack of iodine causes an enlarged thyroid gland (goitre)	lackvitamincausesscurvy

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