1:3:1 Recall the food test reagents and their colour changes

Question 1

List the Reagent used in Glucose (Simple sugars) and the change in colour, and whether heat is required.

Answer 1

Reagent: Benedict’s
Colour at the start: Blue
End colour: Brick-Red Precipitate
Heat: Required

Question 2

List the Reagent used in Starch (Complex Carbohydrates) and the change in colour, and whether heat is required.

Answer 2

Reagent: Iodine
Colour at the start: Yellow-Brown
End colour: Blue-Black
Heat: Not needed

Question 3

List the Reagent used in Protein and the change in colour, and whether heat is required.

Answer 3

Reagent: Biuret
Colour at the start: Blue
End colour: Purple
Heat: Not needed

Question 4

List the Reagent used in Fats and the change in colour, and whether heat is required.

Answer 4

Reagent: Ethanol
Colour at start: Clear
Colour at end: White Emulsion
Heat required: No

Question 5

List the Reagent used in Fats and the change in colour, and whether heat is required.

Answer 5

Reagent: Ethanol
Colour at start: Clear
Colour at end: White Emulsion
Heat required: No