Question

#1: The following reaction occurs in a voltaic cell: Cu2+ + Zn --> Zn2+ + Cu. Which of the following reactions occurs at the anode?

A. Cu2+ + Zn --> Zn2+ + 2e-

B. Cu2+ + 2e- --> Cu

C. Zn --> Zn2+ + 2e-

D. Cu2+ + 2e- --> Zn2+ + Cu

**no clue at all!! :( @aaronq what do u think!? :D

Answer 1

okay, what happens at the anode, oxidation or reduction?

Answer 2

anode is oxidation right? :)

Answer 3

correct, so look at the reaction they gave you:

Cu2+ + Zn --> Zn2+ + Cu

which one is being oxidized?

Answer 4

answer choice C?

Answer 5

yep! in oxidations you're losing electrons, so e are in the products

Answer 6

ooh! yay :) thanks!!

posting the next one now! :D still in this post tho! :D

Answer 7

no problem! post away!

Answer 8

#2: Look at the diagram attached. If electrons flow from the right half-cell to the left one through the wire, which of the following statements is true?

A. Reduction occurs at the right strip.

B. Oxidation occurs at the left strip.

C. Both oxidation and reduction occur at both strips.

D. Oxidation occurs at the right strip.

**no clue again :(

confusion alert!! haha :P

Answer 9

what do u think? :O

Answer 10

immediately we can eliminate C, because that can't happen lol

now, if electrons flow from the right to the left, which side is being reduced and which is being oxidized?

Answer 11

haha i see :P kk :)

right is reduced? and left is oxidized? :/ not sure:/

Answer 12

or is it the other way around? :/

Answer 13

okay, if electrons flow from the right to the left, which is the anode and which is the cathode?

Answer 14

anode is right? and cathode is left?

Answer 15

yep, the site where electrons flow from is the anode

Answer 16

and what happens at the anode?

Answer 17

oxidation?

Answer 18

exactly

Answer 19

so its D.Oxidation occurs at the right strip. ?? :O

Answer 20

haha yep !

Answer 21

ahh i see now! awesome! thank you :)

posting another one here :)

Answer 22

haha no prob. just identify the flow of electrons, and where electrons flow from, thats the anode, then everything else falls into place!

Answer 23

#3: You conduct a series of electrochemical reactions in which various metals get deposited onto another: aluminum onto iron, iron onto nickel, nickel onto copper, and copper onto iron. Only the copper-onto-iron reaction needs electricity. Rank the activity of these metals from highest to lowest!

A. aluminum, iron, nickel, copper

B. iron, aluminum, nickel, copper

C. aluminum, copper, iron, nickel

D. copper, nickel, iron, aluminum

**my answer; A

i'm not 100% sure though!! What do you think? :)

Answer 24

okay :) will do! i just need to remember the process!! haha :P

Answer 25

sorry that took me so long, yes you're right. I've never used "activity series" only reduction potentials, so it's confusing haha

Answer 26

haha no worries! :)

yayy :)

hehe ima post the last 2 in a new link now! :D i'll tag u :) gracias!! :D

Answer 27

okay ! haha no problem :)

Answer 28

haha no worries! :)

yayy :)

hehe ima post the last 2 in a new link now! :D i'll tag u :) gracias!! :D