Food tests

Question 1

What are the steps of a starch food test? (3)

Answer 1

1. Crush up food using pestle and mortar
2. Add a spatula full to the dimple tray
3. Add a couple drops of iodine

Question 2

Negative and positive results of a starch food test

Answer 2

Negative- Orange/brown
Positive- Blue/black

Question 3

What are the steps of a protein food test? (5)

Answer 3

1. Crush food using pestle and mortar
2. Add to a test tube
3. Add 5cm (cubed) of water
4. Mix
5. Add 12 drops of Biuret solution

Question 4

Negative and positive results of a protein food test

Answer 4

Negative- Blue
Positive- Purple/violet

Question 5

What are the steps of a sugar food test? (4)

Answer 5

1. Crush up food using pestle and mortar
2. Add to a test tube
3. Add 5cm (cubed) of water
4. Add 2cm (cubed) of Benedict’s solution

Question 6

Negative and positive results of a sugar food test

Answer 6

Negative- Blue
Positive- Orange/brick red

Question 7

What are the steps of a fat food test with filter paper? (2)

Answer 7

1. Rub food sample onto paper
2. Hold to the light

Question 8

Positive and negative results of a fat food test with filter paper

Answer 8

Negative- Clear/no mark
Positive- White emulsion/translucent glow

Question 9

What are the steps of a fat food test with ethanol? (4)

Answer 9

1. Crush food
2. Add ethanol
3. Shake
4. Add an equal amount of water