miss_kasie (miss_kasie) wrote in aphelp,

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balancing equations

When given a problem like Cu + H2O(g)-> how do I solve it? Is there a process to find out what type of reaction happened? I also had the problem of balancing correctly, but the reaction I wrote couldn't happen in real life (e.g.: I thought KClO3-> became 2KClO3->K2+2ClO3, so I got it wrong because i found out it can't happen). Which rules would help me avoid that from happening again? even some good links would be greatly appreciated, because I'm so confused! Please help me! :(

Here's some examples from a packet that could be used if needed. the answers are below, but i couldn't understand how to be able to find them on a test:

Write correctly balanced equations for these expressions:
1) KClO3 ->
Ans: 2KClO3 -> 2KCl+3O2

2) KBr + MnO2 + H2SO4 ->
Ans: 2KBr + MnO2 + 2H2SO4 -> 2K^(+1) + Br2 + Mn^(2+) + 2H2O + 2SO4^(2-)

3) AgCl(s) + NH3(aq)
Ans: AgCl(s) + 2NH3(aq) -> Ag(NH3)2^(+1) + Cl^(-1)(aq)

4) Cu + H2O(g)
Ans: Cu + H2O(g) -> Cu^(2+)(aq)
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