Food Tests

Question 1

how do you test for sugar

Answer 1

benedict’s solution

Question 2

how to test for starch

Answer 2

iodine solution

Question 3

how to test for protein

Answer 3

biuret solution

Question 4

how to test for lipids

Answer 4

sudan 111

Question 5

if there is sugar present what colour will the benedict solution turn

Answer 5

from blue to green, yellow or brick red

Question 6

if there is starch present what colour will the iodine solution turn

Answer 6

from brown to blue-black

Question 7

if there is protein present what colour will the biuret solution turn

Answer 7

from blue to pink or purple

Question 8

if there is lipids present what colour will the sudan 111 solution turn

Answer 8

separate into 2 layers top layer would be bright red

Question 9

how to prepare for a food test

Answer 9

• break it up in a pestle and mortar
• transfer the food into a beaker and add distilled water
• stir with glass rod to dissolve
• filter to get rid of solid bits of food

Question 10

how to test for sugar

Answer 10

• transfer 5cm of food into a test tube
• prepare water bath to 75 degrees
• add b solution-pipette
• test tube in water bath for 5 mins

Question 11

How to test for starch

Answer 11

• 5 cm into a test tube

- add iodine and shake

Question 12

How to test for proteins

Answer 12

• transfer 2 cm to test tube

- add 2cm buret solution and shake

Question 13

How to test for Lipids

Answer 13

• transfer 5cm into a test tube

- add drops of sudan 111 stain solution and shake