Question

PLEASE HELP ....In the unbalanced equation below, what element is being reduced?

MnO2 + HCl → H2O + MnCl2 + Cl2

A. Mn

B. O

C. H

D. Cl

Answer 1

@.Sam.

Answer 2

@jhonyy9 someone plz hlp

Answer 3

can someomne confirm a trying to get a perfect 100

Answer 4

write the half reactions, then see which one gets reduced.
reduction = gaining an electron

Answer 5

so it would be O correct

Answer 6

no

Answer 7

ty for helping me

Answer 8

im lost n have 7 min
to finish

Answer 9

well at the end its gains cl..

Answer 10

okay you need to identify the oxidation state of every atom

Answer 11

ok

Answer 12

Mn and Cl on both sides of the arrow

Answer 13

whats the oxidation state of Mn on the left?

Answer 14

o2

Answer 15

you can calculate this since O is 2-, you have 2 oxygen atoms so 4- to cancel this out, the Mn has to be 4+. Do you understand that?

Answer 16

no im sorry im so lost and i have 2 min to turn it in just confirm itss A?

Answer 17

Cl is 1-
On the right side of the arrow, Mn is with 2x Cl so the Cl is 2- . the Mn has to be 2+

The Mn goes from 4+ to 2+, so it gains 2 electrons, this it the element that gets reduced
So A is correct :D

Answer 18

thank u!!!!!! tahts wut i said in beginning lol thank u!!

Answer 19

yes but you have to understand why. It's useless to just tell you it's A. Do you understand the stuff i just explained?

Answer 20

yea i understand some but im somewhat lost in chem especially talking it over the internet for a high school program.. i have my ged bc of my work but i need a "official diploma" for my dad to be happy

Answer 21

okay :P

Just remember
O= 2-
H= 1+
Cl = 1-
Mn can have various oxidation states.

When you see HCl, the total oxidation state has to be 0. The hydrogen is 1+ and the chlorine is -1. these 2 cancel eachother out as 1-1 = 0

Now for MnO2, you know oxygen is 2-
You have 2 oxygen atoms so the total is 4-
To cancel the other half out the manganese has to be 4+ :P

for the MnCl2 it works the same but not its with chlorine which is 1-
2x chloring = 2-
to cancel the other half out the manganese has to be 2+

When an element gains an electron, the oxidation state decreases by one because electrons have a negative charge. So when the oxidation state goes from +4 to +2 you know it gains 2 electrons. and that is reduction :D

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Answer 22

did you figure things out?

Answer 23

think of those oxidation states like money, they get reduced if they became lower. it is easy for the (+) oxidation states, but how about when you just have negative (-)?
let us say from 2- to 3-, see mathematically the value is lower for 3- so it still follows the idea that it got reduced.

But before you solve anything, just write down the reaction and products first, then put their oxidation states as you balance them.

Answer 24

yea thank u guys for your help!! i really appriciate all the extra help!!!!

Answer 25

i always mess up writing them dwn wrong