Food tests

Question 1

How do you prepare the sample first

Answer 1

you break up the food using a pestle and mortar- add 5cm cubed of the food into a beaker and add distilled water stir this with a glass rodd - use filter paper to funnel out all of the liquid from the mashed up food

Question 2

How to do the surgar test- step 1

Answer 2

take out 5cm3 of the food sample put it into test tube

Question 3

sugar test step 2:

Answer 3

Add benedicts solution to the test tube 10 drops

Question 4

Sugar test: step 3

Answer 4

Place in water batj using tube holder leave it there for 5 minutes

Question 5

What are the results you would get?

Answer 5

for a reducing sugar: blue,green yellow or brick red- colour depends on how much sugar is in it

Question 6

Iodine solution test for starch

Answer 6

put the food sample in test tube(5cm) few drops of iodine solution shake

Question 7

What results should you get if it contains starch?

Answer 7

browny black to blue black

Question 8

Buiret test for proteins

Answer 8

put 2cm3 of the food sample in the test tube- add 2cm of the solution gently shake this

Question 9

What happens if the food sample contains protein?

Answer 9

blue, pink, purple

Question 10

What happens in the sudden 111 test for lipids?

Answer 10

transfer 5cm cubed of food source- add 3 drops of sudan solution gently shake tube

Question 11

How to know if it contains lipids?

Answer 11

Seperate into two layers if lipids are present, top layer will go bright red