Standard and objective: by D5D29A5



Standard and objective:
3a, b Investigate the motion of particles.
   a. Identify evidence that particles are in constant motion.
   b. Compare the motion of particles at various temperatures by measuring changes in
       the volume of gases, liquids, or solids.

Question: Where is the balloon the biggest?

Description: The students will measure the diameter of a balloon full of air. Put the
balloon into a microwave and heat for 5-10 seconds and re-measure. Put the balloon
into a freezer for 5-10 minutes and re-measure.

Materials needed: Balloons, string, metric ruler, Microwave and freezer. The same
results can be obtained using a hair dryer and a sink of cold water.

Prior knowledge needed: Particles move.

Time required: 15 – 30 Minutes

Special procedures, safety notes, and suggestions: This is an extra credit
assignment for the 7th Graders.

   1) Draw a line with a marker on the balloon where it will be measured. Depending
      upon the type of balloon the time in the freezer and the microwave will vary. Test
      it first with the ones that you have.
   2) Blow up the balloon and draw a line around the middle. Using a string measure
      the Circumference. Record
   3) Put the balloon into the freezer for 5-10 minutes. Quickly take it out and re-
      measure along the same line.
   4) Put the balloon in the microwave and heat for 1-4 minutes. Quickly take it out
      and re-measure along the same line.
   5) Answer these questions.

             a. Why did the balloon seem to shrink?

             b. Why did the balloon seem to get bigger?

             c. Draw sketches that would show both processes.

             d. Based on your experiments, write a conclusion (3-4 sentences) where
                the answer to the question above is addressed and supported by

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