Simple Sugars / Complex Sugars - Science

TESTING FOR SIMPLE SUGARS - THE BENEDICTS TEST:

Aim: To test a sample of food to determine whether it contains simple sugars.

Equipment: Bunsen Burner, Test Tube Tongs, Benedicts Solution & A Sample Of Food.

Method: 

1. Place about 2mL of the sample into a test tube and then add 5 drops of Benedicts Solution.

2.  Heat with a Bunsen until it changes color. Do not boil.

Results:

When we hovered the solution above the bunsen burner it gradually started changing to a  greenish yellow as we took it off the Bunsen through time it began turning orange. 

Conclusion:

In conclusion, this experiment went well. The purpose of why it changed is that different molecules interacted with each other which is why it changed color. The color change indicates that there were sugars present.

TESTING FOR COMPLEX SUGARS  - THE IODINE TEST :

Aim: To test if a sample of food contains complex sugars.

Equipment: Test Tube, Food Sample & Iodine Solution. 

Method:

1. Place about 2mL of the sample in the test tube.

2. Add 3-5 drops of iodine and mix. 

Results:

The bread changed color where the iodine was dropped from white to black to purple. Then later on the areas where the iodine was not dropped, it began to become dark purple.

Conclusion: 
In conclusion, the bread changed color due to the change in molecules when a different molecule is added to another molecule, it changes color. The change of color means sugars were present.