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2014-09-17
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Author: EsMargara
Subject: Science
Topic: Molecules
Grade Level: 6th
Teacher Presentation: Yes
Student Activity: Yes
Materials needed: 2 different colored ballons per group (for example, red
and white), peppermint extract, medicine droppers
Lesson Time: One class period
Description:
This lesson should be presented after the students have received background
information on what molecules are. (the combination of atoms)
The teacher should initially explain the balloons are made up of 2 molecules,
rubber molecules and dye molecules (what gives balloons their color).
Explain: before you blow up a balloon the rubber molecules in it are coiled
together like cooked spaghetti on a plate, the dye molecules are trapped
between each of the coils. When you blow up a balloon the wall of the
balloon becomes thinner, when this happens the molecules become uncoiled.
Instead of the molecules being really close together, they begin to grow
apart and spread, this is why when you blow up a balloon the color becomes
lighter and lighter the bigger you make it.
One person in the group should blow up the white balloon and tie it. A
second person in the group should get the medicine dropper and before blowing
up the red balloon put about 4 drops of peppermint extract inside the
balloon. (tell the children to becareful with getting the extract on the lip
of the balloon because it tastes pretty awful, although not harmful) After
the extract is in the red balloon blow it up, and tie it, then shake it for
about 30 seconds.
Each person in the group should take turns smelling the outside of each
balloon and commenting on what things they observe. Have the students try to
figure out why you can smell the peppermint on the outside of the balloons
although it was placed inside the balloon. (Although you cannot see them,
the surface of the balloon contains tiny holes. You can smell the peppermint
because the peppermint is also made up of molecules, but these molecules are
so small that they can pass through the tiny holes in the balloons.
Have the students brainstorm possibilities in groups. Have the students
share their anwers.