- carbohydrates are made up of units of sugar
- simple sugars are carbohydrates that contain only 1 or 2 sygar units- they turn into blue Benedict's solution brick read on heating
- complex carbohydrates contain long chains of simple sugar units bonded together,
starch turns yellow- red
iodine solution blue- black
- lipids consist of 3 molecules of fatty acids bonded to a molecule of glycerol, the ethanol test indicates the presence of lipids in solutions
- protein molecules are made up of long chains of amino acids, biuret reagent turns from blue to purple in the presence of proteins
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