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ICLE Standards:
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Science as Inquiry: Develop the abilities of
scientific inquiry.
The Living Environment: Develop an understanding
of water content in seeds.
The Physical Setting: Develop an understanding
of gas expansion.
Number Relationships: Make application of the
mathematical concept of percent.
Measurement: Extend understanding of mass.
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Performance Task:
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For this task, you are to work in pairs to conduct
an investigation to determine the percent composition of water in popcorn
seed. Find the mass of a specified amount of popping corn seed (e.g., one
quarter cup) before and after popping. Use your results to find the percent
of water that there was in the seeds before popping. Compare your results
with at least four other pairs of students in your class. In your math
journal, explain how you arrived at your answer, showing any formula used
and/or any required computations. You do not have to show the computations
for which you used a calculator, but give a thorough explanation of what
you did. Explain whether or not your results are similar to the others
pairs in the class with whom you compared your results. If you differed
significantly from other pairs, give an explanation as to why that happened.
Note to the teacher: You might extend this activity by having the students
investigate the effect of soaking the seeds prior to popping, agricultural
problems with high humidity, variations in percent composition of water in
different species of popping corn seeds, or volume before and after
popping.
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Knowledge / Skills:
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Know and apply the principles of scientific
inquiry. (xs1)
Measure properties of the environment using
dimensional quantities such as time, length, mass, pressure, volume,
acceleration, etc. Compare quantities and consider the error involved with
measuring environmental properties.
(s23)
Understand physical/chemical change (e.g.,
change of phase between gases, liquids, and solids). (s57)
Perform operations with signed (positive and
negative) numbers, including decimals, ratios, percents, and fractions.
(Texas 8th - Compute with rational numbers in the solution of problems.)
(Texas 5th - Compute with whole numbers, fractions, and decimals
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Use writing as a tool for learning in formats
such as learning logs, laboratory reports, note-taking, and journals. (ela40)
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