Oxidation of food 3 Flashcards
How can you determine if oxidation has taken place in a product molecule
If a product molecule has a larger oxygen:hydrogen ration than the reactant then oxidation has taken place
Primary alcohols can be oxidised to …
aldehydes then carboxylic acids
Secondary alcohols can be oxidised to …
ketones
Tertiary alcohols can be oxidised to …
they cannot
Can ketones be oxidised
no
What happens when an aldehyde os oxidised
a carboxylic acd is formed
How can ketones and aldehydes be told apart
ketones do not oxidise aldehydes do
What chemicals can be used to test for ketones or aldehydes
acidified potassium dichromate, fehling’s solution, Tollens’ reagent
What does it mean if no changes occur when acidified potassium dichromate, fehling’s solution, Tollens’ reagent are used
ketone
acidified potassium dichromate is used on an aldehyde. State the colour change
yellow to green
Fehling’s solution is used on an aldehyde. State the colour change
blue to brown
Tollens’ reagent is used on an aldehyde. State the colour change
colourless to silver mirror
