Food Tests

Question 1

How do you prepare your food sample?

Answer 1

1) get a peice of food and break it up using a pestle and mortar
2) transfer the ground up food to a beaker and add some distilled water
3) stir the mixture with a glass rod to dissolve some of the food
4) filter the solution using a funnel lined with filter paper to get rid of solid bits of food

Question 2

What solution is used to test for starch?

Answer 2

Iodine

Question 3

What solution is used to test for sugar?

Answer 3

Benedict

Question 4

What solution is used to test for protein?

Answer 4

Biuret

Question 5

What solution is used to test for lipids?

Answer 5

Ethanol

Question 6

What colour will the food sample go if starch is present?

Answer 6

From brown-orange to blue-black

Question 7

What colour will the food sample go if sugar is present?

Answer 7

From blue to green (low sugar), yellow (more sugar), brick red (lots of sugar)

Question 8

What colour will the food sample go if sugar is present?

Answer 8

From blue to brick red

Question 9

What other colours will a food sample turn if sugar is present (depending on severity, in order)

Answer 9

Green, and yellow

Question 10

Which food test needs a water bath? Why?

Answer 10

Benedict because it changes colour when heated

Question 11

What colour will the food sample go if protein is present?

Answer 11

From blue to purple

Question 12

What colour will the food sample go if lipids are present?

Answer 12

From clear to cloudy white