November 30, 2021, 08:11:05 AM
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Topic: Electrochemistry (Grade 11) Minor lack of understanding of my notes  (Read 4268 times)

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Offline s3a

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Can someone explain what exactly is being said below the orange line please?

Like the text near "ex:" doesn't even relate chronologically at least to what is being portrayed beneath. Am I wrong? Is it being portrayed chronologically? Like can someone break down what the notes are saying for me so that I could understand it better?

Any help would be greatly appreciated!
Thanks in advance!

Offline UG

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Okay, so here we have:

Mg + Zn2+  :rarrow: Mg2+ + Zn

From this we know: Mg is more easily oxidised than Zn
Then:

Sr + Mg2+  :rarrow: Sr2+ + Mg

From this we know: Sr is more easily oxidised than Mg.
So far we have from easiest to hardest we have: Sr - Mg - Zn

Then:

2Al + 3Zn2+  :rarrow: 2Al3+ + Zn

We know: Al is more easily oxidised than Zn, so it must be below zinc.

Lastly:

3Mg + 2Al3+  :rarrow: 3Mg2+ + 2Al

From this we get: Mg is more easily oxidised than Al, so it must be below Al.

Therefore the final order goes: Sr - Mg - Al - Zn  :)
Understand it now? :)

Offline s3a

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Thanks! I get it now :D

like I get the Toughest to Easiest with the chemical systems part.

However, I do not understand the part that says: "Mg reacts with Zn2+ but not Sr2+. Al reacts with Zn2+ but not Mg2+. Average the 4 metal from least to most easily oxidized."

Offline UG

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However, I do not understand the part that says: "Mg reacts with Zn2+ but not Sr2+. Al reacts with Zn2+ but not Mg2+.
Mg will reduce Zn2+ but not Sr2+.
Al will reduce Zn2+ but not Mg2+.

Offline s3a

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Are you sure you meant reduced and not oxidized? because as written on the image: "Certain metals can be OXIDIZED more easily than others. It is related to how "hungry" the substance is for electrons."

(What I asked you to confirm was the example of the above quotation)

Offline Astrokel

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UG is right as Mg and Al are the reducing agents. Your quotation is correct but the second part can be misleading.

http://en.wikipedia.org/wiki/Reactivity_series
No matters what results are waiting for us, it's nothing but the DESTINY!!!!!!!!!!!!

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