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Tuesday, February 17, 2009

Balancing Chemical Equations

Boys&Girls,
Balancing a chemical equation is a very important knowledge in chemistry. What u need to do when u have to balance a chemical equation?
e.g. Al + CuO --> Al2O3 + Cu
Now the equation is not balanced.. Firstly U have to know how many Al atoms are on your left? Only 1 but you have 2 Al atoms on your right.. so u put a no 2 infront of Al...
2Al + CuO --> Al2O3 + Cu
Now u find that the number of oxygen isn't balance.. so you'll have to do something.. you can add the no 3 to CuO so that you have 3 oxygen atoms...
2Al + 3CuO --> Al2O3 + Cu
Problem now is... you have 3 Cu atoms on your left but only 1 Cu atom on your right... to make it balance, you can add the no 3 to Cu...
2Al + 3CuO --> Al2O3 + 3Cu
Now you hae a balanced equation... It is not that difficult right... try this and tell me your answer:
a) H2 + O2 --> H2O
b) Fe + Cl2 --> FeCl3
c) KMnO4 + HCl --> KCl + MnCl2 + H2O + Cl2
Good Luck :D

11 comments:

  1. a) 2H2 + 02 --> 2H2O

    b) 2Fe + 3Cl2 --> 2FeCl3

    c) KmnO4 + 4HCl --> KCl + MnCl2 + 4H2O + Cl2
    (after that ?)

    I think my answer is wrong . lols Cheers !

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  2. tq kenneth.. answers for a and b are correct... good!... for c... anyone else would like to try???

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  3. teacherr... x dapattt, question (c)...

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  4. teacher,,balanced equation c..difficult o...

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  5. Cecelia huh? welcome in... Come on.. U guys try to balance it first before I give u the answers... TRY!!! cheers lol

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  6. Teacher , Tel us what is the answer for question C

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  7. okay...
    answer:
    2KMnO4 + 16HCl --> 2KCl + 2MnCl2 + 8H2O + 5Cl2
    since I've given u the answer... lets try another a few more....
    1. C4H10 + O2 --> CO2 + H2O
    2. C7H6O2 + O2 --> CO2 + H2O
    3. NaOCl --> NaClO3 + NaCl
    All da best!!!! ;)

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