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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:
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dropper bottles A-C
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wax paper sheets
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dropper bottle with iodine solution
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waste cup
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glucose test strips
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paper towels
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test card
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safety goggles
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Background:
- Iodine solution turns blue-black in the presence of starch.
- Glucose test strips turn green in the presence of the sugar
glucose.
Directions:
- Put your safety goggles on.
- 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.
- In the space below, describe the procedures you followed in
conducting your experiment.
- CARRY OUT YOUR EXPERIMENT.
When carrying out your experiment, place a wax paper sheet over
the test card to protect it.
- Record the COLOR of the test strips and the solutions in the
data table below.
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Indicator
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Solution A
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Solution B
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Solution C
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Glucose Test Strips
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Iodine Solution
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- Blot the wax paper with a paper towel and wipe off the test
card. Throw away any garbage into the waste cup.
- Using the data you have collected and the background information,
which solutions contain sugar?
________________________________________________
In the space below, explain the reason for your answer.
- Using the data you have collected and the background information,
which solutions contain starch?
________________________________________________
In the space below, explain the reason for your answer.
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