Course Calendar

Friday, October 10th

Science 10

Collecting BUG LAB - due today
Climatograph introduction
Biome Investigation & matching of climatographs
Biome Investigation

Biology 12

Organic Molecule Mystery Introduction
Carbohydrate video
Carbohydrate Mystery Lab
Work on Carb section of journal
Set up duotang workbooks

Identification of an Unknown                                                       

Test the unknown sample, the known samples and water using the following tests.     

Reducing sugar test: positive test (colour change to orange or red)
Place 3ml of each solution in a separate, appropriately labelled test tube.  Put 3 ml of water in another tube as a control sample.  To each tube add 5 drops of Benedicts solution.  Record initial colour.  Heat the mixtures in a hot water bath for 2 to 3 minutes and observe any colour changes.  Record final colour.  Which samples contain sugar?

Observations:
Samples
Initial Colour
Final Colour
Sugar present?
1.         



2.         



3.         



4.         



5.         




Complex Carbohydrate test: positive test (colour change to black)

Place 5 drops of each solution of extract on a drop plate.  Put 5 drops of water on the plate as a control sample.  Record initial colour.  Add 2 drop of iodine solution to each sample.  Observe any colour changes other than that due to the iodine solution.  Record final colour.  Which samples contain complex carbohydrates?

Observations:
Samples
Initial Colour
Final Colour
Complex Carbs present?
1.         



2.         



3.         



4.         



5.