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You can also move the balloon toward the wall. The excess negative payday loans charge on the balloon repels negative charge on payday loans online surface of the wall. This leaves payday loans online positive charge on the surface of the wall. The negatively charged balloon is attracted to the positive area on the wall.


This is like moving the charged payday loans online strip toward the finger. Either do the following demonstration or show the video Balloon and Water. The American Chemical Society is dedicated to improving lives through Chemistry. Project the image Pencil Zoom. Ask students questions such as the following: What are the three different tiny particles that make up an atom.


Protons, neutrons, and electrons. Which of these is in the center of the atom. Protons and neutrons are in the center (nucleus) of the atom. You may want to mention that hydrogen is the only atom that usually has no neutrons. The nucleus of most hydrogen atoms is composed of just 1 proton. A small percentage of hydrogen atoms have 1 or even 2 neutrons. Atoms of the same element with different numbers of neutrons are called isotopes. These will be discussed in Lesson 2. What zooms around the nucleus of an atom.


Electrons Which one has a positive charge, a negative charge, and no charge. The charge on the proton and electron are exactly the same size but opposite. The same number of protons and electrons exactly cancel one another in a neutral atom. Show animations and explain that protons and electrons have opposite charges and attract each other. Project the animation Hydrogen Atom.


Give each student an activity sheet. Explore Do an activity to show that electrons and protons attract each other. Question to investigate What makes objects attract or repel each other.


Quickly pull your top hand up so that the plastic strip runs through your fingers. Do this three or four times. Allow the strip to hang down. Then bring your other hand near it. Expected results The plastic will be attracted to your hand and move toward it.


Explain Show students models comparing the number of protons and electrons in the plastic and skin before and after rubbing them together. Explore Have students investigate what happens when a rubbed plastic strip is held near a desk or chair. Procedure, part 2 Charged plastic and neutral desk Charge one strip of plastic the same way you did previously. This time, bring the plastic strip toward your desk or chair. Expected results The plastic moves toward the desk.


Have students charge two pieces of plastic and hold them near each other to see if electrons repel one other. Ask students to make a prediction: What do you think will happen if you charge two strips of plastic and bring them near each other. Procedure, part 3 2 pieces of charged plastic Charge two strips of plastic Slowly bring the two strips of plastic payday loans near each other.


Expected results The strips will move away or repel each other. Ask students: What happened when you brought the two pieces of plastic near each other.


The ends of the strips moved away from each other. Use what you know about electrons and charges to explain why this happens. Each strip has extra electrons so they are both negatively charged. Because like charges repel, the pieces of plastic repelled each other. Explore Have students apply their understanding of protons and electrons to explain what happens when a charged balloon is brought near pieces of paper.


Materials for each group Inflated balloon Small pieces of paper, confetti-size Procedure Rub a balloon on your hair or clothes.

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