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Year 9 Biology > Food Tests > Flashcards

Food Tests Flashcards

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1
Q

What is the method of the iodine test (starch)

A

Add several drops of iodine solution to solid food or liquid

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2
Q

What is the result of the iodine test (starch)

A

Orange/yellow to blue/black

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3
Q

What is the name of the test, when testing for sugar?

A

Benedict’s test

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4
Q

What is the method of the benedict’s test? (Sugar)

A
  • dissolve food in water, using a pestle and mortar
  • add to a boiling tube
  • add 2cm cubed of benedict’s solution
  • place in a water bath for 2-3 minutes
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5
Q

What is the name of the test, when testing for starch?

A

Iodine test

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6
Q

What is the results for a benedict’s test (sugar)

A

Turns from blue to green to brick red

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7
Q

What’s the name of the test when testing for protein?

A

Biuret test

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8
Q

What’s the method of the biuret test? (Protein)

A
  • Dissolve food in 1cm cubed of water using a pestle and mortar
  • add to a boiling tube
  • add 1cm cubed of dilute sodium hydroxide
  • add 3 drops of copper sulphate
  • shake and watch
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9
Q

What’s the results for the biuret test? (Protein)

A

Starts a pale blue and turns to violet

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10
Q

What’s the name of the test when testing for fat?

A

Emulsion test/paper spot test

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11
Q

What is the method for the emulsion/paper spot test? (fat)

A

-cut food into very small pieces, place in a boiling tube and add 3cm cubed of ethanol. Shake and leave to settle. Half fill a second test tube with water. Carefully add drops of the solution from the 1st tube to the water.

You can also test for fat by rubbing a solid food on a piece of greaseproof paper

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12
Q

What is the result on the emulsion/paper spot test? (Fat)

A

Emulsion:
Water will become cloudy, especially at the top of the test tube

Paper spot test:
The fat will leave a greasy translucent stain on the paper

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13
Q

What’s the method of the biuret test? (Protein)

A
  • Dissolve food in 1cm cubed of water using a pestle and mortar
  • add to a boiling tube
  • add 1cm cubed of dilute sodium hydroxide
  • add 3 drops of copper sulphate
  • shake and watch
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14
Q

What’s the results for the biuret test? (Protein)

A

Starts a pale blue and turns to violet

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15
Q

What’s the name of the test when testing for fat?

A

Emulsion test/paper spot test

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16
Q

What is the method for the emulsion/paper spot test? (fat)

A

-cut food into very small pieces, place in a boiling tube and add 3cm cubed of ethanol. Shake and leave to settle. Half fill a second test tube with water. Carefully add drops of the solution from the 1st tube to the water.

You can also test for fat by rubbing a solid food on a piece of greaseproof paper

17
Q

What is the result on the emulsion/paper spot test? (Fat)

A

Emulsion:
Water will become cloudy, especially at the top of the test tube

Paper spot test:
The fat will leave a greasy translucent stain on the paper

Year 9 Biology (6 decks)

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