Required Practical-Food Tests

Question 1

Test for starch step 1

Answer 1

Place a small amount if food on the spotting tile

Question 2

Test for starch step 2

Answer 2

Add a few drops of iodine solution to the food on the spotting tile

Question 3

Test for starch step 3

Answer 3

The yellow-red iodine will turn blue-black if starch is present.

Question 4

Test for starch step 4

Answer 4

Record the results in a table

Question 5

Test for starch step 5

Answer 5

Repeat steps 1-4 for other foods

Question 6

Test for sugar step 1

Answer 6

Place a small amount of food in a test tube

Question 7

Test for sugar step 2

Answer 7

Add enough benedict’s solution to cover the food

Question 8

Test for sugar step 3

Answer 8

Place the test tubes in warm water bath for roughly 10 minutes

Question 9

Test for sugar step 4

Answer 9

The blue benedict’s solution will turn brick red on heating if sugar is present

Question 10

Test for sugar step 5

Answer 10

Record your results in a table

Question 11

Test for sugar step 6

Answer 11

Repeat the previous steps other foods

Question 12

Test for lipids step 1

Answer 12

Place a small amount of food into a test tube

Question 13

Test for lipids step 2

Answer 13

Add a few drops of ethanol to the test tube

Question 14

Test for lipids step 3

Answer 14

Shake the test tube and then leave for a minute

Question 15

Test for lipids step 4

Answer 15

Pour the solution into a test tube with water

Question 16

Test for lipids step 5

Answer 16

If lipids are present, it should form a cloudy white layer

Question 17

Test for lipids step 6

Answer 17

Record the results on a table

Question 18

Test for lipids step 7

Answer 18

Repeat the previous steps for other foods

Question 19

Test for protein step 1

Answer 19

Place a small amount of food in a test tube

Question 20

Test for protein step 2

Answer 20

Add 1cm^3 biuret reagent.

Question 21

Test for protein step 3

Answer 21

The reagent will turn purple if protein is present

Question 22

Test for protein step 4

Answer 22

Record the results on a table

Question 23

Test for protein step 5

Answer 23

Repeat the previous steps