Key ConceptsAtoms are made of incredibly tiny pwrite-ups called protons, neutrons, and electrons.Protons and neutrons are in the facility of the atom, consisting of the nucleus.Electrons surround the nucleus.Proloads have a positive charge.Electrons have an adverse charge.The charge on the proton and also electron are specifically the same dimension however oppowebsite.Neutrons have actually no charge.Due to the fact that opposite charges tempt, proloads and also electrons attract each other.
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Students will certainly put a static charge on a sexpedition of plastic by pulling it in between their fingers. They will certainly view that the plastic is attracted to their fingers. Students will certainly be presented to the principle that rubbing the strip with their fingers led to electrons to relocate from their skin to the plastic giving the plastic an adverse charge and their skin a positive charge. Thstormy these activities, students will certainly be introduced to some of the characteristics of electrons, prolots, and also neutrons, which comprise atoms.
Students will certainly have the ability to define, in terms of electrons and protons, why a charged object is attracted or repelled by another charged object. They will certainly also have the ability to describe why a charged object can also be attracted to an uncharged object. Students will certainly also have the ability to describe that the attractivity in between positive prolots and also negative electrons holds an atom together.
Downfill the student activity sheet, and also distribute one per student as soon as stated in the activity. The task sheet will serve as the “Evaluate” component of each 5-E lesboy arrangement.
Be sure you and also the students wear correctly fitting goggles.
Materials for Each GroupPlastic grocery bagScissorsInflated balloonSmall pieces of paper, confetti-size
Materials for DemonstrationSink Balloon
Do an task to display that electrons and proloads lure each other.
Students have the right to see evidence of the charges of protons and also electrons by doing an task with static electrical energy.
Note: When two products are rubbed together in a static electrical energy task, one material has a tendency to shed electrons while the other material often tends to get electron. In this activity, humale skin tends to shed electrons while the plastic bag, made of polyethylene, tends to obtain electrons.
Concern to investigate
What makes objects tempt or repel each other?
Materials for each groupPlastic grocery bagScissors
Procedure, part 1Charged plastic and also charged skinCut 2 strips from a plastic grocery bag so that each is around 2–4 cm wide and also around 20 cm long.
Hold the plastic strip firmly at one finish. Then grasp the plastic spilgrimage in between the thumb and fingers of your other hand also as displayed.
The plastic will certainly be attracted to your hand also and move toward it. Students might notification that the plastic is likewise attracted to their arms and sleeves. Let students understand that later on in this lesson they will certainly investigate why the plastic spilgrimage is additionally attracted to surdeals with that have not been charged (neutral).
Note: If students discover that their plastic sexpedition does not move toward their hand also, it must not have actually been charged well enough. Have them try charging their plastic strip by holding it down on their pants or shirt and then conveniently pulling it via the various other hand also. Then they need to test to view if the plastic is attracted to their garments. If not, students have to attempt charging the plastic aget.Explore
Have students investigate what happens once a rubbed plastic spilgrimage is hosted near a desk or chair.
Procedure, component 2Charged plastic and also neutral deskCharge one sexpedition of plastic the same means you did formerly.
This time, bring the plastic sexpedition toward your desk or chair.
The plastic moves toward the desk.
Exsimple to students why the plastic is attracted to the desk. The answer takes a pair of steps, so you deserve to overview students by drawing or projecting a enhanced illustration of the plastic and desk.
After pulling the plastic between their fingers, the plastic gains added electrons and a negative charge. The desk has actually the same number of proloads as electrons and also is neutral. When the plastic gets cshed to the desk, the negatively charged plastic repels electrons on the surface of the desk. This makes the surconfront of the desk near the plastic slightly positive. The negatively charged plastic is attracted to this positive location, so the plastic moves toward it.
Have students charge two pieces of plastic and also host them near each various other to check out if electrons repel one other.
Ask students to make a prediction:What carry out you think will take place if you charge 2 strips of plastic and carry them close to each other?
Procedure, part 32 pieces of charged plasticCharge two strips of plasticSlowly bring the 2 strips of plastic close to each various other. Write “attract” or “repel” in the chart on the activity sheet.
The strips will certainly move amethod or repel each various other. Due to the fact that both strips have actually additional electrons on them, they each have extran unfavorable charge. Because the very same charges repel one one more, the strips move away from each other.
Ask students:What happened as soon as you carried the two pieces of plastic near each other?The ends of the strips relocated away from each other.Use what you recognize about electrons and charges to explain why this happens.Each sexpedition has additional electrons so they are both negatively charged. Since choose charges repel, the pieces of plastic repelled each other.Explore
Have students use their understanding of prolots and electrons to explain what happens as soon as a charged balloon is brought near pieces of paper.
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Materials for each groupInflated balloonSmall pieces of paper, confetti-size
ProcedureRub a balloon on your hair or clothes. Extra Extend
Demonstprice just how electrons can lure a stream of water.
Either execute the complying with demonstration or present the video Balloon and Water.
Materials for the demonstrationSinkBalloon
ProcedureRub a balloon on your shirt or pants to give it a static charge. Turn on the faucet so that tright here is a very thin stream of water. Slowly carry the charged part of the balloon cshed to the stream of water.
The stream of water must bend as it is attracted to the balloon.