Question

Fan + Medal for a step by step walkthrough of this problem

Answer 1

The E value is easy, since it's given after the reaction. The tricky part is finding the value of "n".

In redox reactions, do you know what the value of "n" means?

Answer 2

No I don't

Answer 3

do you know how to take a redox reaction and split it into the two half-reactions?

Answer 4

Nope, Just assume I know nothing bc I'm so bad at this

Answer 5

@JFraser

Answer 6

do you see the charge of the chromium when it's a reactant and the \(different\) charge when it's a product?

Answer 7

No I don't I don't what any of that means, I literally need someone to hold my hand and go step by step to solving this

Answer 8

look at the charge of the chromium when it's a reactant. What is it?

Answer 9

What's the chromium?

Answer 10

you don't know the element symbols? how much chemistry have you studied before this?

Answer 11

I took it once and failed. And now I'm taking it again and I've never heard the word chromium

Answer 12

find the symbol "Cr" on a periodic table

Answer 13

found it

Answer 14

what is its name?

Answer 15

Chromium

Answer 16

ok. now look at the charge of the chromium when it's a reactant, and look at the charge of the chromium when it's a product.

Answer 17

2Cr^3+(aq) is when it's a reactant?

Answer 18

and what is the charge when its a product?

Answer 19

2Cr(s)

Answer 20

so the charge changes from \(Cr^{+3}\) to a \(Cr^0\). The only way to do that is to \(gain\) three electrons

Answer 21

\[Cr^{+3} + 3e^{-1} \rightarrow Cr^0\]

Answer 22

see how adding the negative charge of the electrons makes the total net charge on each side equal?

Answer 23

I guess so

Answer 24

@JFraser

Answer 25

when electrons are \(added\) to an element to change its charge, we say that the element is reduced.

Look at the tin (Sn) and notice how \(its\) charge does the \(opposite\)?

Answer 26

Okay