9.2 Voltaic cells (SL)

9.2 Voltaic cells
Understandings:
Oxidation occurs at the anode (negative electrode) and reduction occurs at the cathode (positive electrode) in a voltaic cell.
Applications and skills:
Construction and annotation of both types of electrochemical cells.
Explanation of how a redox reaction is used to produce electricity in a voltaic cell.
Distinction between electron and ion flow in voltaic cells.

Link to worksheet:

[gmnavy]

A voltmeter is not a series instrument as shown in your diagram. A good voltmeter is one which has a near infinite internal resistance. So no electrons ca possibly pass through it. I suggest a lamp be includedin the wire connecting the two terminals. A voltmeter can be connected across the lamp

[alihazem]

Why here the cathode is positive (+) while in the electrolytic cell cathode is negative (-)

[lifecadre]

Why anode is negative Electrode, if it is loosing electrons??

[karkoush]

If the anode is losing electrons then it should the positive electrode and if the cathode is receiving these negative electrons, it should be negative, how is it the other way around???

[histeeiop]

Dear sir, my chemistry teacher said the ionic components in salt bridge should not overlap with that of the solution.
Ex) If the solution contains SO4, then salt bridge should not contain SO4.
Is this really true? Because I have never heard of it, and I couldn't even find such information in the text book. My chemistry teacher is very eccentric, so instead I would like to ask you about that.

[justingentry]

Some segments in the video are stamped not adjacent to each other

[acplays]

I think the electrolyte chosen for the cathode half cell is not right. Because there needs to be a negative ion rather than a positive, so SO4 2- instead of Cu2+. This is because only then the K+ of the salt bridge will be able to neutralise the electrolytic solution of the cathode half cell.

[andrehuellstrung]

Metal higher in the activity series is reduced not oxidized