Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Arranging Chemical reactions into

  1. Aug 12, 2006 #1
    Metal AX BX CX DX EX
    A - + + + +
    B + - + - -
    C + + - + -
    D - - - - -
    E + + + + -

    Arrange the following metals A,B,C,D and E according to increasing reactivity out of the information
    given above. Use The Symbol of greater than (>) in indicating that one metal is more reactive than the other. Ex A>B>E means metal A is more reactive than B and B is more reactive than E.

    Dont know were to start...
    i just know that E + AX = There is a reaction where E > A etc.
  2. jcsd
  3. Aug 13, 2006 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    What information is this? What do the entries (+,-) in this matrix represent?
  4. Aug 13, 2006 #3
    + means that there is a reaction
    - means that there's no reaction

    and my diagram is a table... and sorry for that, cant skip it
  5. Aug 13, 2006 #4
    If a metal A displace out another metal B from another metal's solution (BX), then this means that metal A is more reactive than metal B.

    From the first row of the table, we can get A>B, A>C, A>D, A>E.
    Then, from the second row, we get, B>A and B>C.
    For the third row, C>A, C>B and C>D,
    From the 4th row, we can conclude that metal D is the least reactive among the 5 metals.
    5th row, E>A, E>B, E>C, E>D.

    However, I think there is something wrong with this question, since we get A>B, and B>A, (and many other contradictions) which only one of them can be true.

    Can you please check back the question? Thanks.:smile:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook