Charge Which items in the Sticky Tape Lab exhibited a charge What behavior was displayed that makes you believe those objects were charged No Charge Were there items that were not charged neutral ID: 743845
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Slide1
Sticky Tape Lab
A DiscussionSlide2
Charge
Which items in the Sticky Tape Lab exhibited a charge?
What behavior was displayed that makes you believe those objects were charged?Slide3
No Charge?
Were there items that were not charged (neutral)?
What behavior was displayed that makes you believe
those
objects
were not
charged?Slide4
Neutral
If the paper and foil were neutral, how can you explain their attraction to both the positive and negative tapes?
What does neutral really mean?
No charge?
Equal amounts of positive and negative charges?Slide5
Timing
When did the tapes become charged?
If they didn’t become charged until after we pulled them apart, what conclusion can we make?Slide6
Transfer
What is the smallest “subatomic particle” we are aware of that can be transferred?
Atoms?
Does moving an atom or a group of atoms from one place to another change the charge of something?
There must be something smaller than an atom that can be transferred.Slide7
Something Smaller
Based on our observations so far, what characteristics can we assign to the object that was transferred?
It’s smaller than an atom
It’s mobile (it moved from one tape to another
)
It has a charge (moving it changed the charge of both tapes)Slide8
Which Charge?
If
the object is
charged,
does it have a positive
or
negative charge?
With the aid of research presented at the end of our lab, we determined the top tape (
T tape
) was positive and the bottom tape (
B tape
) was negative.Slide9
Two Possibilities
If the mobile charged object is positive, it moved from the B tape to the T tape, increasing the positive charge of the T tape while increasing the negative charge of the B tape.
If the mobile charged object is
negative,
it moved from the
T
tape to the
B
tape, increasing the positive charge of the
T
tape while increasing the negative charge of the
B
tape.Slide10
Summary
The object is smaller than an atom
The object is mobile
The object has a charge
Research tells us the charge is negative
We call this charged mobile object an electron.Slide11
J.J. Thomson’s Experiment
http://
www.kentchemistry.com/links/AtomicStructure/JJThompson.htmSlide12
J. J. Thomson’s Atomic Model
J.J
. Thomson came up with a new model of an atom to incorporate this tiny negative particle that we call electrons.
The red
dots represent the electrons, which he called plums.
They
are negative. The rest of the atom was like a bowl of pudding. The bowl of pudding is
positive.
. .
. .
.Slide13
The Plum Pudding Model
T
he
plums (electrons) transferred from the pudding (atom) of the
T
tape to the
B tape.
T
he
bottom tape is “plum rich” and the top tape is “plum poor”Slide14
Neutral Objects
Can this model explain how a neutral object can be attracted to both positive and negative
?Slide15
Last Question!
Why was the foil more attracted to the charged objects than the paper was
?
What do you know about metals and electricity?