Food tests

Question 1

what is the first step for a food test?

Answer 1

1. get a piece of food and break it up using a pestle and mortar

Question 2

what is the second step for a food test?

Answer 2

2. transfer the ground up food to a beaker and add some distilled water

Question 3

what is the third step for a food test?

Answer 3

3. give the mixture a good stir with a glass rod to dissolve some of the food

Question 4

what is the fourth step for a food test?

Answer 4

4. filter the solution using a funnel lined with filter paper. this will get rid of the solid bits of food

Question 5

what is the reagent used for sugars and what do you need to do in the food test?

Answer 5

benedicts solution
(heat the sample)

Question 6

what is the reagent used for starch and what do you need to do in the food test?

Answer 6

iodine
(gently shake)

Question 7

what is the reagent used for proteins and what do you need to do in the food test?

Answer 7

biurets test
(gently shake)

Question 8

what is the reagent used for lipids and what do you need to do in the food test?

Answer 8

sudan III
(gently shake)

Question 9

what happens if the sugars test has a positive result and a negative result?

Answer 9

positive ~ changes from blue to brick red
negative ~ stays the same

Question 10

what happens if the starch test has a positive result and a negative result?

Answer 10

positive ~ changes from browny orange to blue black
negative ~ stays the same

Question 11

what happens if the proteins test has a positive result and a negative result?

Answer 11

positive ~ changes from blue to purple
negative ~ stays the same

Question 12

what happens if the lipids test has a positive result and a negative result?

Answer 12

positive ~ 2 layers will form bright red layer at the top with a white layer at the bottom
negative ~ stays the same