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8th Grade Performance Task
Contributed by: New York State Education Department (NYSED)
NYS Alternative Assessment in Science Project (1996)
Student #3
Task:
At this station, you will experiment to determine
which of three solutions contain starch and sugar.
Materials:
- dropper bottles A - C
- dropper bottle with iodine solution
- glucose test strips
- test card
- wax paper sheets
- waste cup
- paper towels
- 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.
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Directions:
- Put your safety goggles on.
- Place a wax paper sheet over the test card.
- Place two drops of each solution on the wax paper over the circle
on the test card with the same letter.
- Dip the end of a glucose test strip in each of the three solutions.
Use a new strip for each solution.
- Record the COLOR of the glucose test strips on the data
table below.
- Add one drop of iodine solution to each solution.
- Record the COLOR of the solutions on the data table below.
- Blot the wax paper with a paper towel and wipe off the test
card. Throw 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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