Required Practicals - Food tests

Question 1

What does Benedict’s solution test for?

Answer 1

Sugars

Question 2

What does the iodine test test for?

Answer 2

Starch

Question 3

What do we use to test for lipids?

Answer 3

ethanol

Question 4

What do we use to test for protein?

Answer 4

biuret solution

Question 5

What is the apparatus for Benedict’s test for sugars?

Answer 5

-food sample
-test tube
-Benedict’s solution
-traditional water bath
-thermometer
-pipettes

Question 6

What is the method for Benedict’s test for sugars?

Answer 6

-set up a water bath using a Bunsen burner
-put some of the food sample into a test tube
-add a few drops of Benedict’s solution to the sample in the test tube
-put the test tube at a minimum 80 degrees C for about 5 mins
-Note down a colour change.

Question 7

What colour does Benedict’s solution turn in the presence of sugar?

Answer 7

Blue to yellow/orange

Question 8

What is the apparatus for the Iodine test for Starch?

Answer 8

-food sample
-test tube
-iodine solution
-pipettes

Question 9

What is the method for the iodine test for starch?

Answer 9

-put some of the food sample into a test tube
-add a few drops of Iodine solution
-note down any colour changes

Question 10

What colour does Iodine turn starch?

Answer 10

It turns the starch blue/black

Question 11

What is the apparatus for the Biuret’s solution test for protein?

Answer 11

-a test tube
-10cm3 measuring cylinder
-Biuret solution

Question 12

What is the method for the Biuret’s solution test for protein?

Answer 12

-put some food sample into a test tube
-add 1cm3 of Biuret’s solution
-shake the tube gently
-note any colour change

Question 13

What colour does protein turn to in the presence of Biuret’s solution?

Answer 13

It goes from blue to violet