Chemistry Of Food

Question 1

What are carbohydrates

Answer 1

Made of units of sugar
Simple sugars are carbohydrates containing only one or two sugar units - turn blue Benedict solution red on heating
Complex carbohydrates contain long chains of simple sugar units bonded together

Question 2

What is starch

Answer 2

Turns blue / black if present in iodine solution

Yellow or red if not present

Question 3

What are lipids

Answer 3

Consist of 3 molecules of fatty acid bonded to a molecule of glycerol
Ethanol test indicated presence of lipids in solution
Orange or if present

Question 4

What are protein molecules made of

Answer 4

Long chains of amino acids

Biuret reagent turns blue to purple in presence of proteins