B3.3 (Food tests)

Question 1

How to test for starch

Answer 1

Iodine test for startch-yellow-red iodine solution turns blue-black if starch is present

Question 2

Protein (test)

Answer 2

Biuret test-blue Biuret reagent turns purple if protein is present

Question 3

Lipids (test)

Answer 3

Ethanol test-ethanol added to a solution gives a cloudy white layer if a lipid is present. Ethanol is highly flammable and harmful

Question 4

Carbonydrates

Answer 4

Are mad up of units of sugar

Contain only one or two sugar units
Complex carbohydrates contain long chains of simple sugar units bonded together.

Question 5

Protein

Answer 5

Made up of lonkg chains of amino acids