B2.1.2 - Food Tests Flashcards Preview

SHHS - Science - B2.1 Health and Lifestyle - Year 8 > B2.1.2 - Food Tests > Flashcards

Flashcards in B2.1.2 - Food Tests Deck (14)
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1

Which solution do we use to test for sugars?

Benedict's solution

2

Which solution do we use to test for starch?

Iodine solution

3

What colour is Benedict's solution when it contains no simple sugars?

Blue

4

What colour is iodine solution when there is no starch present?

Orange

5

What colour is iodine solution in the presence of starch?

Blue/Black

6

How do we prepare a food sample?

1. Crush the food with a pestle and mortar.
2. Add a few drops of distilled water and mix well.

7

What is distilled water?

Pure water (it contains no other chemicals)

8

How do you test for starch?

1. Add a few drops of iodine solution to a food sample.
2. If solution turns blue/black starch is present.

9

How can you test for SOLID lipids?

1. Rube the piece of food on filter paper.
2. Hold paper to light source.
3. If paper turns translucent - lipids are present.

10

What does translucent mean?

Slightly see-through

11

How can you test for lipid in a food solution (LIQUID)

1. Add a few drops of ethanol to the food solution.
2. Shake tube and leave for 1 minute.
3. Pour ethanol into a tube of water.
4. If solution turns cloudy - lipids are present.

12

How do you test for simple sugars?

1. Add a few drops of Benedict's solution to the food sample.
2. Heat the test tube in a water bath.
3. If the solution turns orange/red the food contains simple sugars.

13

How do you test for protein?

1. Add a few drops of copper sulfate to food solution.
2. Add a few drops of sodium hydroxide.
3. If solution turns purple - proteins are present.

14

What colour is copper sulfate solution?

Blue