year 9 biology food tests

testing for starch

1. using a measuring cylinder, measure 2ml of water into a test tube. 

2. add a small spatula of starch and shake 

3. add 4 drops of iodine.

4. record the colour change of the iodine. 

1 of 10

testing for protein

1. measure 2ml of water into a test tube. 

2. add a small spatula of protien powder and shake. 

3. add 2ml of bluret solution 

4. record the colour change of the bluret solution.

2 of 10

testing for fats (lipids)

1. place 3 drops of oil onto test tube. 

2. add 5ml of ethanol and shake the test tube to dissolve the oil. 

3. leave the tube to settle for 2 minutes. 

4. pour the top two thirds of liquid into a clean test tube.

5. add a small amount of water and record the colour change. 

3 of 10

testing for sugar (glucose)

1. measure 3ml of water into a boiling tube. 

2. add a spatula of glucose and shake. 

3. add 3ml of benedicts solution.

4. half fill a beaker with water and heat it on a tripod and gauze until the water is boiling.

5. turn off the bunsen. 

6. stand the boiling tube containing glucose and benedicts solution in water and record what happens. 

4 of 10

STARCH

reagent name - iodine

colour of the reagent before the test - orange/ brown

colour ofreagent after the test - black / purple

heathing involved - no

5 of 10

PROTEIN

reagent name - bluret 

colour of the reagent before the test - blue

colour ofreagent after the test - light purple

heathing involved - no

6 of 10

FATS

reagent name - ethanol 

colour of the reagent before the test - colourless

colour ofreagent after the test - cloudy white 

heathing involved - no

7 of 10

SUGAR

reagent name - benedict 

colour of the reagent before the test - blue

colour ofreagent after the test - orange

heathing involved - bunsen burner

8 of 10

SUGAR

reagent name - benedict 

colour of the reagent before the test - blue

colour ofreagent after the test - orange

heathing involved - bunsen burner

9 of 10

SUGAR

reagent name - benedict 

colour of the reagent before the test - blue

colour ofreagent after the test - orange

heathing involved - bunsen burner

10 of 10

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