Food Experiments

Question 1

What is the test for starch and what are the effects of a successful experiment?

Answer 1

Add iodine

Any starch present will turn the iodine solution from yellow/brown to blue/black

Question 2

What is the test for sugar and what are the effects of a successful experiment?

Answer 2

Benedicts Solution

Any sugar in the food will turn the solution green and then eventually red/brick red

Question 3

What is the test for protein and what are the effects of a successful experiment?

Answer 3

Biuret solution

Any protein present will turn the solution fro, blue to purple

Question 4

What is the test for fat and what are the effects of a successful experiment?

Answer 4

Ethanol and water

Fat will cause the water to change from clear to form a white emulsion at the top of the solution

Question 5

Name four foods tested which contain protein

Answer 5

Potato
Albumin (egg white)
Milk
Biscuit

Question 6

The amount of energy contained in a foodstuff is often measured using a piece of apparatus called a ….. …….

Answer 6

Food calorimeter

Question 7

How do you calculate the amount of energy in food?

Answer 7

Energy released =
mass of water(g) x temp. rise (。c) x 4.2
—————————————————
mass of food sample (g)