SEKOLAH MENENGAH KEBANGSAAN SRI PERMATA PETALING JAYA

PEKA FORM 2

Name :___________________________________ Date :_____________

Class :___________________________________

Title :____________________________________________________________________

Aim :____________________________________________________________________

__________________________________________________________________________________

Problem :____________________________________________________________________

Hypothesis :____________________________________________________________________

Variable : a) Manipulated :______________________________________________________

b) Responding : _______________________________________________________

c) Fixed : ____________________________________________________________

Apparatus : ___________________________________________________________________

__________________________________________________________________________________

Material :____________________________________________________________________

__________________________________________________________________________________

Procedure :

Food test Diagram

1 Starch

Put a little starch solution in a test tube as shown

in the diagram on the right.

Add a few drops of iodine solution in a test tube.

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2 Glucose

Put a little glucose solution in a test tube.

Add a few drops of Benedict’s solution.

Heat the test tube and its contents in a water bath

as shown in the diagram.

3 Protein

Put a little albumen solution in a test tube.

Add a few drops of Million reagent.

Heat the test tube in a water bath as shown in the

diagram.

4 Fat

Add one drop of cooking oil onto a piece of filter

paper.

Heat the filter paper with the oil over a Bunsen

burner.

Observation :

Food test Observation

1 Starch

2 Glucose

3 Protein

4 Fat

Discussion :

2

Cooking oil

heat

1. Name one other food substance which can be used to replace glucose solution and albumen

solution in this activity.

a) Glucose solution : ________________________________________________

b) Albumen solution : ________________________________________________

2. Name one test material which can be used to replace Benedict’s solution for testing glucose.

__________________________________________________________________________

3. a) Predict what will be observed if a few drops of iodine solution are put on a piece of

potato.

______________________________________________________________________

b) Give an inference for your answer.

___________________________________________________________________

4. Based on your observation in this activity, define starch operationally.

___________________________________________________________________________

___________________________________________________________________________

Conclusion :

1. Iodine solution is used to test the presence of ________________________

2. Benedict’s solution is used to test the presence of ____________________

3. Million’s reagent test is used to test the presence of ___________________

4. The translucent spot test is used to test the presence of ________________

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