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### Topic: Dont fully understand how you balance equations  (Read 3220 times)

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#### poodlefish

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##### Dont fully understand how you balance equations
« on: February 14, 2005, 03:54:23 AM »
Dont fully understand how you balance equations...

I understand how you use numbers to make it equal on both sides, but I dont understand how the valence works....

For example, I'll do

Aluminium plus Oxygen goes into Aluminium Oxide

Al(val +3) + O2(val-2) > Al2O3

To balance it, I know you make it

4Al(val +3) + 3O2(val-2) > 2Al2O3

BUt i dont see how the valence comes into the picture, and how it works..

All help is greatly appreciated.

#### Donaldson Tan

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##### Re:Dont fully understand how you balance equations
« Reply #1 on: February 14, 2005, 09:25:26 AM »
the valency tells u how to determine the molecular formula of the product. then u vary the coefficients to get the equal number of atoms of each element on the LHS & RHS
"Say you're in a [chemical] plant and there's a snake on the floor. What are you going to do? Call a consultant? Get a meeting together to talk about which color is the snake? Employees should do one thing: walk over there and you step on the friggin� snake." - Jean-Pierre Garnier, CEO of Glaxosmithkline, June 2006