what do you call that white circular metal?

The white circular metal is I think a piece of zinc. I'm not sure

can someone talk in the video and explain what's going on

when we put the wire to water the compass does not move..... when we put it in vinegar it moves..... mainly because of the chemicals present in vinegar

At 1:13 , the needle on the compass moved when the two circles touched vinegar. However , I didn't really understand what happened. Can you explain it a little more so I can have a clear understanding.

When the needle moves, that means there is a current (charge) that is moving between the copper and the zinc disks that are in the vinegar. Copper likes to gain electrons and zinc likes to lose them so the flow goes from the zinc to the copper. Remembering that current is defined in the opposite direction to the flow of electrons, the current is then flowing from the copper to the zinc. Vinegar has ions in it that are capable of transferring charge (It is an electrolyte - a solution with ions in it that can transfer a current through it). Pure water does not have ions in it to conduct the charge so the galvanometer needle doesn't move when the metals are dipped into the water.

Why does the compass needle move at 1:13 ...What actually happens? Can u explain that?

There is electricity flowing through the wire, causing an electromagnetic force.

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Electrolyte test (pure water vs. vinegar)

Name: Electrolyte test (pure water vs. vinegar)
Uploaded: 2013-04-20T15:47:32Z
Description: First we attach our galvanometer to a piece of copper and zinc. Then we submerge the metals in pure water and vinegar. What is the difference? Why?

Google Classroom

First we attach our galvanometer to a piece of copper and zinc. Then we submerge the metals in pure water and vinegar. What is the difference? Why? Created by Brit Cruise.

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naziaislam363
Posted 10 years ago. Direct link to naziaislam363's post “Why isn't water an electr...”
Why isn't water an electrolyte? I know covalent compounds aren't supposed to be elctrolytes but what about polarity? Can't polar compounds be electrolytes?
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(6 votes)
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- SAKSHAM
  Posted 9 years ago. Direct link to SAKSHAM's post “for being an electrolyte ...”
  for being an electrolyte the first condition that comes is of electricity conductivity. as pure water is not conductive and does not have much free ions for conduction, it is not an electrolyte
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  (1 vote)
tammy barnes
Posted 10 years ago. Direct link to tammy barnes's post “i have another question i...”
i have another question i did this in my back yard and i left for 3 minutes and there were flies in the vinegar and the my compass was lower when i left and whin i came back it was higher ?
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Gildas Dubois
Posted 10 years ago. Direct link to Gildas Dubois's post “Could you use the "stop-b...”
Could you use the "stop-bath" of silver based photography instead of vinegar for a stronger effect? They were interchangeable, "real stop-bath" would just last longer and stink less.
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Sai Sai
Posted 10 years ago. Direct link to Sai Sai's post “what do you call that whi...”
what do you call that white circular metal?
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(1 vote)
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- adam.fu16 (>'-')>
  Posted 10 years ago. Direct link to adam.fu16 (>'-')>'s post “The white circular metal ...”
  The white circular metal is I think a piece of zinc. I'm not sure
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Tais Price
Posted 9 years ago. Direct link to Tais Price's post “can someone talk in the v...”
can someone talk in the video and explain what's going on
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(1 vote)
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- Rhea Sharma
  Posted 9 years ago. Direct link to Rhea Sharma's post “when we put the wire to w...”
  when we put the wire to water the compass does not move.....
  when we put it in vinegar it moves.....
  mainly because of the chemicals present in vinegar
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  (2 votes)
rgbmanse
Posted 9 years ago. Direct link to rgbmanse's post “At 1:13 , the needle on t...”
At
1:13
, the needle on the compass moved when the two circles touched vinegar. However , I didn't really understand what happened. Can you explain it a little more so I can have a clear understanding.
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(1 vote)
Answer
- areimers703
  Posted 8 years ago. Direct link to areimers703's post “When the needle moves, th...”
  When the needle moves, that means there is a current (charge) that is moving between the copper and the zinc disks that are in the vinegar. Copper likes to gain electrons and zinc likes to lose them so the flow goes from the zinc to the copper. Remembering that current is defined in the opposite direction to the flow of electrons, the current is then flowing from the copper to the zinc. Vinegar has ions in it that are capable of transferring charge (It is an electrolyte - a solution with ions in it that can transfer a current through it). Pure water does not have ions in it to conduct the charge so the galvanometer needle doesn't move when the metals are dipped into the water.
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  (2 votes)
sidra Rashid
Posted 10 years ago. Direct link to sidra Rashid's post “Why does the compass need...”
Why does the compass needle move at
1:13
...What actually happens? Can u explain that?
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(1 vote)
Answer
- Abel John
  Posted 10 years ago. Direct link to Abel John's post “There is electricity flow...”
  There is electricity flowing through the wire, causing an electromagnetic force.
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Miles Hennis
Posted 10 years ago. Direct link to Miles Hennis's post “I highly doubt that penny...”
I highly doubt that penny is copper!
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- GeniusBrain1000
  Posted 9 years ago. Direct link to GeniusBrain1000's post “Every penny is made out o...”
  Every penny is made out of copper. Go ask the US mint place where they made them
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  (1 vote)
Flanny
Posted 9 years ago. Direct link to Flanny's post “Was this really pure, dem...”
Was this really pure, demineralised, water? It looks like mineral water is used in the video. Would this difference affect the outcome of the experiment?
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(1 vote)
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Bye :)
Posted 10 years ago. Direct link to Bye :)'s post “What did you get the zinc...”
What did you get the zinc from?
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(1 vote)
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- Judith Jones
  Posted 10 years ago. Direct link to Judith Jones's post “They came from an electri...”
  They came from an electrical casing. I am sure you can get zinc from other places too.
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  (1 vote)