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Starch and Sugar Testing 2
Task with Student Directions
Contributed by: New York State Alternative Assessment in Science Project (NYSED)

Task: At this station, you will design and carry out an experiment to determine which of three solutions contain starch and sugar.

Materials:

dropper bottles A-C

wax paper sheets

dropper bottle with iodine solution

waste cup

glucose test strips

paper towels

test card

safety goggles

Background:

  • Iodine solution turns blue-black in the presence of starch.
  • Glucose test strips turn green in the presence of the sugar glucose.

Directions:

  1. Put your safety goggles on.

  2. You have been provided with three (3) unknown solutions and two (2) indicators. Using the background above and your knowledge of science, think carefully about an experiment you could do to determine if starch and/or sugar are present in any of the three solutions.

  3. In the space below, describe the procedures you followed in conducting your experiment.















  4. CARRY OUT YOUR EXPERIMENT.
  5. When carrying out your experiment, place a wax paper sheet over the test card to protect it.

     

     

  6. Record the COLOR of the test strips and the solutions in the data table below.

    Indicator

    Solution A

    Solution B

    Solution C

    Glucose Test Strips

         

    Iodine Solution

         

     

  7. Blot the wax paper with a paper towel and wipe off the test card. Throw away any garbage into the waste cup.

  8. Using the data you have collected and the background information, which solutions contain sugar?
  9. ________________________________________________

    In the space below, explain the reason for your answer.









  10. Using the data you have collected and the background information, which solutions contain starch?
  11. ________________________________________________

    In the space below, explain the reason for your answer.







     

 


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