exp 1.1 food

Question 1

substrate for the test of protein

Answer 1

milk or egg whites

Question 2

chemical used to test for protein

Answer 2

biuret reagent

Question 3

biuret reagent

Answer 3

copper sulphate + sodium hydroxide

Question 4

control for the test for protein

Answer 4

water

Question 5

colour change in the test for protein

Answer 5

blue changes to violet in the presence of protein

Question 6

substrate for the test for fats

Answer 6

oil/butter

Question 7

method for test for fats

Answer 7

rub a drop of oil/butter on brown paper

Question 8

control for test for fats

Answer 8

rub water in brown paper

Question 9

change in the test for fats

Answer 9

oil leaves a stain on brown paper after drying (translucent stain)

Question 10

substrate for the test for starch

Answer 10

bread or potato

Question 11

chemical used for the test for starch

Answer 11

iodine

Question 12

control used in the test for starch

Answer 12

water

Question 13

colour change in the test for starch

Answer 13

yellow-red changes to blue-black

Question 14

substrate for the test for reducing sugar

Answer 14

glucose powder or lucozade

Question 14

colour change in the test for reducing sugar

Answer 14

blue to brick red

Question 14

chemicals used in the test for reducing sugar

Answer 14

benedicts solution

Question 15

control in the test for reducing sugar

Answer 15

water

Question 16

what is required for the colour change to occur in the test for reducing sugar

Answer 16

solution must be heated