Required food tests practical

Question 1

How do you test for fat?

Answer 1

ethanol

Question 2

How do you test for sugars?

Answer 2

Benedicts reagent

Question 3

How do you test for protein?

Answer 3

biurets reagent

Question 4

How do you test for starch?

Answer 4

Iodine solution

Question 5

What is the colour change when ethanol is added to foods with fat?

Answer 5

The substance turns from colourless to a cloudy white colour

Question 6

what is the colour difference when adding Benedicts reagent to sugars?

Answer 6

colour goes from blue to anywhere from green, yellow, orange, brick red increasing in the amount of sugar detected

Question 7

what is the colour difference in iodine solution when starch is detected?

Answer 7

It changes from an orange to a black blue colour

Question 8

what is the colour difference in the biuret solution when protein is detected?

Answer 8

it goes from a blue colour to pink purple lilac colour

Question 9

what do you have to do to Benedicts solution before it begins to show changes?

Answer 9

Heat the mixture

Question 10

what are the risks surrounding ethanol and iodine and Biuret regent?

Answer 10

ethanol is flammable, iodine stains and biuret reagent is an irritant