Oxidation And Chemistry Of Cooking

Question 1

When primary alcohols are oxidised they produce _____

When secondary alcohols are oxidised they produce _____

Answer 1

Aldehydes

Ketones

Question 2

What are the most common oxidising agents used for oxidation of aldehydes?

Answer 2

Tollens Reagent
Fehlings solution
Acidified potassium dichromate solution

Question 3

Colour change for tollens reagent
Fehlings solution
Acidified potassium dichromate solution

Answer 3

Colourless to silver
Blue to orange/ red
Orange to green

Question 4

Increase in oxygen hydrogen ratio is

Decrease in oxidation hydrogen ratio is

Answer 4

Oxidation

Reduction

Question 5

Describe a reaction of carboxylic acids

Answer 5

Reduction to produce aldehydes and primary alcohols

Question 6

What are antioxidants?

Answer 6

Used in food to prevent oxidation and therefore rancid flavour

Question 7

Why are aldehydes in food dangerous?

Answer 7

They can oxidised to produce carboxylic acids which are very acidic

Question 8

Describe another antioxidant needed

Answer 8

Edible oils stored in oxygen can oxidise and cause spoilage to Counter this it is sited in nitrogen which reduces oxygen levels

Question 9

Name another antioxidant

Answer 9

Absorbing acid or vitamin C