Chemistry: Need help BALANCING EQUATIONS

[From: ] [author: ] [Date: 12-01-10] [Hit: ]

-balance the Al:K2CrO4 + 2Al(NO3)3 --> KNO3 + Al2(CrO4)3balance the nitrate as a group:K2CrO4 + 2Al(NO3)3 --> 6KNO3 + Al2(CrO4)3balance the potassium:3K2CrO4 + 2Al(NO3)3 --> 6KNO3 + Al2(CrO4)3the chromate group is also balanced by the potassium step. Its now balanced.My balancing materials:http://www.chemteam.info/Equations/Equat…Look for more videos. Look for Kahn Academy and kentchemistry.......

Fe + 3O2 --------------> 2Fe2O3 Notice now the O's have 6 on each side. Can you balance the Fe's now?

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I always figure out how many of each element I have on either side first:

K2CrO4 + Al(NO3)3 --> KNO3 + Al2(CrO4)3
K - 2 , K - 1
Cr - 1, Cr - 3
O - 4, O - 12
Al - 1, Al - 2
NO3 (stays together) - 3, NO3 - 1

Then I figure out what I would need to do to make the numbers match up by placing coefficients in the equation. It makes the guessing and checking less time-consuming, at least for me.

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balance the Al:

K2CrO4 + 2Al(NO3)3 --> KNO3 + Al2(CrO4)3

balance the nitrate as a group:

K2CrO4 + 2Al(NO3)3 --> 6KNO3 + Al2(CrO4)3

balance the potassium:

3K2CrO4 + 2Al(NO3)3 --> 6KNO3 + Al2(CrO4)3

the chromate group is also balanced by the potassium step. It's now balanced.

My balancing materials:

http://www.chemteam.info/Equations/Equat…

Look for more videos. Look for Kahn Academy and kentchemistry.

Edit: I answer that other person's balancing question. Take a look at my answer:

http://answers.yahoo.com/question/index?…

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