Food tests

Question 1

What was the test for starch and what’s the positive and negative reaction?

Answer 1

Iodine test for starch
Positive : blue-black
Negative : yellow or light brown

Question 2

What was the test for protein and what’s positive and negative the reaction?

Answer 2

Biuret test for protein
Positive : purple or violet
Negative : blue

Question 3

What was the test for carbohydrates and positive and negative reaction?

Answer 3

Benedict’s Test for carbohydrates
Positive :
-Green (low sugar concentration)
-Yellow, orange, or brick-red (high sugar
concentration)
-The red precipitate is due to the reduction
of copper(II) sulfate to copper(I) oxide.
Negative : blue

Question 4

What was the test for fat and what’s the positive and negative reaction?

Answer 4

Ethanol / Emulsion test for fats or lipids
Positive : milky-white
Negative : clear

Question 5

Give the function and examples of carbohydrates.

Answer 5

Function : Gives you energy
Examples : Potato , rice and pasta

Question 6

Give the function and examples of proteins.

Answer 6

Function : Helps your body grow and repair
Examples : Egg white , nuts , fish and beef

Question 7

Give the function and examples of vitamins and minerals.

Answer 7

Function : Helps the body work properly
Examples : Fruits and vegetables

Question 8

Give the function and examples of lipids (fats and oils).

Answer 8

Function : Used to store away energy
Examples : Butter , cheese and oils

Question 9

Give the function and examples of fibre.

Answer 9

Function : Helps lower the risk of a heart disease and healthy digestive system
Examples : Weetabix

Question 10

Give the function and examples of water.

Answer 10

Function : Needed for chemical reactions
Examples : Water