Food Tests(1) Starch And Simple Sugars

Question 1

What solution to use to test for starch?

Answer 1

Iodine solution

Question 2

What color does the solution turn when starch is in foods?

Answer 2

Blue-black colour

Question 3

How to test for simple sugars in food?

Answer 3

Place a small sample of the food in a test tube and add Benedict’s reagent. Heat test tube for a few minutes in hot water bath

Question 4

What color does the mixture turn if simple sugars in present in the food?

Answer 4

Brick red

Question 5

What color does the mixture turn if simple sugars in present in the food?

Answer 5

Brick red

Question 6

What solution is used to test for proteins?

Answer 6

A mixture of sodium hydroxide solution and copper(II) sulfate solution which makes Biuret agent is used to test for proteins.

Question 7

What color is food when the Biuret reagent is added and proteins are present in the food?

Answer 7

Blue to purple

Question 8

What solution is used to test for fats?

Answer 8

Ethanol.

Question 9

True or false: fats are soluble in water

Answer 9

False. Fats are insoluble in water.

Question 10

What color is the food mixture if fats are present?

Answer 10

Cloudy