U2-4-2 - Oxidation of Food Flashcards

Part of the Chemistry of Food topic from Unit 2 of Higher Chemistry, Nature's Chemistry

1
Q

Oxidation

Ratio, not electrons

A

Increase in O:H ratio

Adding O or removing H

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2
Q

Reduction

Ratio, not electrons

A

Decrease in O:H ratio

Removing O or adding H

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3
Q

Primary alcohols can be oxidised into…

A

aldehydes and carboxylic acids.

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4
Q

Secondary alcohols can be oxidised into …

A

ketones.

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5
Q

Which type of alcohols cannot be oxidised?

A

Tertiary

Cannot remove 2 Hs to form C=O bond
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6
Q

Describe the colour change when hot copper(II) oxide is used to oxidise alcohols.

A

Black to brown

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7
Q

Describe the colour change when acidified potassium dichromate is used to oxidise alcohols or aldehydes.

A

Orange to green

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8
Q

Describe the colour change when Fehling’s solution is used to oxidise alcohols or aldehydes.

A

Blue (solution) to brick red (precipitate)

Benedict’s solution gives the same colour change

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9
Q

Describe the change which is seen when** Tollens’ reagent** is used to oxidise a compound.

A

Silver mirror is formed

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