B3.3 the chemistry of food

Question 1

What are the main compounds that make up the structure of the cell

Answer 1

carbohydrates, lipids and proteins

Question 2

what are carbohydrates broken into, and then whats their use?

Answer 2

glucose, which is used in respiration to release energy

Question 3

what are lipids made up of?

Answer 3

three fatty acids joined to a molecule of glycerol

Question 4

what are proteins made up of?

Answer 4

long chains of amino acids

Question 5

what is the food test for carbohydrate- starch?

Answer 5

iodine test

Question 6

what will happen if the test for starch is positive?

Answer 6

orange/brown will turn blue/black

Question 7

what is the food test for carbohydrate- sugars

Answer 7

benedicts test

Question 8

what will happen if the test for sugars is positive?

Answer 8

green/yellow will turn brick red

Question 9

what is the food test for lipids

Answer 9

ethanol

Question 10

what will happen if the test for lipids is positive

Answer 10

colourless to cloudy

Question 11

what is the food test for protein

Answer 11

Biurets test

Question 12

what will happen if the test for protein is positive

Answer 12

blue will turn purple

Question 13

Safety for food tests practical?

Answer 13

1. ethanol is highly flammable- keeps away from flames
2. biuret solution is corrosive- wear eye protection