Food Tests

Question 1

What is the test for sugar and what is the colour change?

Answer 1

Benedict’s solution
Blue -> Brick red

Question 2

What is the test for starch and what is the colour change?

Answer 2

Iodine
Orange/Brown -> Blue/Black

Question 2

What is the test for lipids and what is the colour change?

Answer 2

Ethanol + Water
Colourless -> Cloudy

Question 3

What is the test for proteins and what is the colour change?

Answer 3

Biuret
Blue -> Lilac

Question 4

What is the method for the Benedict’s test?

Answer 4

1) Add food sample to test tube with a few drops of Benedict’s solution
2) Place test tube in water bath at 80*C for 5 minutes

Question 5

What is the method for an iodine test?

Answer 5

1) Add food sample to a test tube
2) Add a few drops of iodine

Question 6

What is the method for the emulsion test?

Answer 6

1) Add food sample to test tube
2) Add a few drops of water
3) Add a few drops of ethanol
4) Gently shake solution

Question 7

What is the method for the biuret test?

Answer 7

1) Add food sample to test tube
2) Add a few drops of biuret
3) Shake solution gently