Chem -plz check work

so i've worked on this some more, now I am asking if someone will plz check my work

2 half cells in a galvanic cell consist of one iron Fe(s) electorde in a solution of iron (II) sulphate FeSO4(aq)and a silver Ag(s) electrode in a silver nitrate solution,
a)state the oxidation half reaction, the reduction helf reaction and the overall cell reaction. remember to eliminiate any spectator ions. describe what will happen to the mass of the cathode and the mass of the anode while the cell is operating.

b)repeat part a, assuming that the cell is operating as an electrolytic cell.

a)Fe(s) -->Fe+2(aq) + Ag(s)
oxidation: Fe(s) -->Fe+2(aq) + 2e-
Reduction: Ag+(aq) + 2e- -->Ag(s)

the massof cathode will grow bigger because it's gaining electrons

b)Ag(s) + Fe(aq) + energy -->Ag+(aq) + Fe(s)
Oxidation: Ag(s) -->Ag+2(aq) + 2e-
Reduction: Fe2+(aq) + 2e- -->Fe(s)
mass of cathode iwll grow bigger because its gaining electrons

  1. 👍 0
  2. 👎 0
  3. 👁 146
asked by Sarah H
  1. I don't think you have it yet but I have made some comments below (in bold).

    2 half cells in a galvanic cell consist of one iron Fe(s) electrode in a solution of iron (II) sulphate FeSO4(aq)and a silver Ag(s) electrode in a silver nitrate solution,
    a)state the oxidation half reaction, the reduction half reaction and the overall cell reaction. remember to eliminiate any spectator ions. describe what will happen to the mass of the cathode and the mass of the anode while the cell is operating.

    b)repeat part a, assuming that the cell is operating as an electrolytic cell.

    a)Fe(s) -->Fe+2(aq) + Ag(s)
    Is this the overall reaction? If so, it should be
    Fe(s) + 2Ag^+(aq) ==>2Ag(s) + Fe^+2(aq)

    oxidation: Fe(s) -->Fe+2(aq) + 2e-
    OK
    Reduction: Ag+(aq) + 2e- -->Ag(s)
    Ag^+(aq) + e ==> Ag(s)

    the mass of cathode will grow bigger because it's gaining electrons
    You are correct that it will grow bigger (I prefer to say that the Ag electode gains mass) BUT not because it gains electrons. Considering that an electron has a mass of only about 10^-28 g. The silver electrode gains mass because silver is depositing on it. When the cell is operating, the Fe electrode is going into solution (look at the equation you wrote for the Fe electrode) and the silver ions are being deposited on the silver electrode (again, look at the half equations you wrote to see that).

    b)Ag(s) + Fe(aq) + energy -->Ag+(aq) + Fe(s)
    electrons are not balanced, Fe(aq) shown with no charge

    Oxidation: Ag(s) -->Ag+2(aq) + 2e-
    Ag^+ and not Ag^+2; therefore 1e- instead of 2e-.
    Reduction: Fe2+(aq) + 2e- -->Fe(s)
    OK

    mass of cathode iwll grow bigger because its gaining electrons.
    The cathode (the Fe electrode) will gain in mass because Fe^+2 + 2e ==> Fe is occurring and Fe is being deposited on the Fe electrode.

    Let me know if anything is not clear.

    1. 👍 0
    2. 👎 0
    posted by DrBob222

Respond to this Question

First Name

Your Response

Similar Questions

  1. sociology

    hi people actually i need 2 do a project on sociology for 20 marks n i cant decide which on a topic ca u all plz help n v also need 2 have a survey or 30-40 interviews plz plz plz plz help its urgent It would really help us

    asked by aditi on August 13, 2007
  2. LIVING ENVIRONMENT

    the ability to grow in size is a characteristic of living organism .Although an icicle may grow in size over time,it is considered nonliving because there is 1)an incerase in matter ,but no increase in the number of icicle. 2)an

    asked by tania sharmin on February 12, 2013
  3. gatsby ENGLISH HELP PLZZ!!

    what role does dan cody play in gatsby's development?? plz help the answer is 1 mark for my quiz but my teacher gave me only 1/2 a mark because i wrote "dan cody was the man who gatsby was with after he left home. gatsby worked

    asked by Sabrina on November 3, 2010
  4. math

    identify the value of x that makes each pair of the ratios equivalent x:4 and 45:20 A.8 B.9 C.10 plz plz plz plz help me!!!!!!!! PLZ!!!!!

    asked by pankakes on November 2, 2015
  5. biology

    a boy inherits genes for tallness,but his growth is limited as a result of poor nitrition. this is an example of 1)an inherited disorder. 2)environmental influence on gene expression . 3)expression of a hidden trait 4)a

    asked by tania sharmin on February 8, 2013
  6. Art

    I left out these sentences. Could you please check them, too? Thank you. Is punctuation OK? 1) People suppose that he worked for Fiat. He is supposed to have worked... 2) Someone asked her about the weather. 3) My parents let me

    asked by John on May 17, 2012
  7. SS HELP PLZ ASAP

    1) The science that studies population distribution and change is called _________(1 point) A. demography B. geography C. economy D. sociology 2) Canada is bigger than the united states, but only has _______ as many people.(1

    asked by regan on November 2, 2015
  8. Math ....urgent help

    i just don't get this elimination method ..... plz help me plz.....teach me how to keep the x and y in a parallel line. and which number to multiply.....plz help -5x-4y=-11 10x=-6-y help me plz......

    asked by vero on January 7, 2009
  9. physics

    A bullet with a mass of 5.00* 10^ -3 kg is loaded into a gun. The loaded gun has a mass of .52 kg. The bullet is fired, causing the empty gun to recoil at a speed of 2.1 m/s. What is the speed of the bullet? ok i worked it out and

    asked by michelle- plz help me!! on December 21, 2007
  10. math

    If 3 people worked and earned $5554.52 in one day. How much does each person earn if one worked for 5 hours, the other worked 7 and the other worked 8 hours?

    asked by Anonymous on November 27, 2016
  11. math

    the volume of a rectangular solid is given by expressions given below.in each case find the dimentions of the solid. a)15x^2-51x+18. b)x^3+13x^2+32x+20. c)x^2-5x/2-3/2. d)x^4+x^3-x-1 plz everyone help me out.till 2 o'clock...plz

    asked by PLZ HELP ME NOW... on May 30, 2012

More Similar Questions