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Paper Hop Problem: How can we show that atoms have positive and negative charges? Hypothesis: If we can rub some electrons off an item, and make it positively charged, then it will stick to an item of the opposite charge. Materials: piece of notebook paper, paper hole puncher, small balloon, clean hair Procedure: 1. Use the hole punch to cut about 15-20 small circles from the piece of paper. 2. Spread the pieces on a table. 3. Inflate the balloon and tie it. 4. Rub the balloon against your hair about five strokes. 6. Hold the balloon close to, but not touching, the paper circles. Observations: The paper circles jump to the balloon. Conclusion: Paper is an example of matter, and all matter is made up of atoms. Each atom has a positive center with negatively charged electrons spinning around outside. The balloon rubs the electrons off of the hair, giving the balloon an excess of negative charges. The positive part of the paper circles is attracted to the excessive negative charge on the balloon. This attraction between the positive and negative charge is great enough to overcome the force of gravity and the circles will hop upward toward the balloon.
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