Food Tests Flashcards

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1
Q

What solution do you add to startch to test the food?

A

Iodine

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2
Q

What colour is iodine

A

Yellow/brown

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3
Q

What happens to iodine in the presence of starch?

A

It turns blue/black

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4
Q

What solution do you use to test for sugar in the food

A

Benedicts

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5
Q

Why do you have to be careful when using benedicts?

A

It’s poisonous

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6
Q

What do you have to do to the benedicts and food to activate it

A

Heat gently

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7
Q

What will the sugar do to benedicts

A

Turn it orange eventually brick red

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8
Q

What solution do you use to test for protein In the food

A

Biuret solution

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9
Q

What is in biuret solution

A

A few drops of copper sulfate and sodium hydroxide

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10
Q

What happens to biuret when protein is present

A

It turns purple

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11
Q

What solution do you use to test for lipid

A

Ethanol

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12
Q

How much ethanol do you add

A

5cm3

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13
Q

How much substance should there be

A

2cm3

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14
Q

What do you have to do to activate it

A

Shake the tube

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15
Q

What does shaking it do

A

Dissolves any lipid

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16
Q

How much water do you add?

A

5cm3

17
Q

What do you have to do again

A

Shake it

18
Q

What will happen to the lipid

A

It will turn a cloudy white emulsion

19
Q

Examples of food with startch

A

Potato crisps

20
Q

Examples of food with sugar

A

Chocolate,biscuits and fruit

21
Q

Examples of food with protein

A

Eggs,chicken and fish

22
Q

Examples of food with fat

A

Ice cream,meat,butter,chips and dairy