June 15, 2024, 05:58:31 AM
Forum Rules: Read This Before Posting

Topic: Dont fully understand how you balance equations  (Read 3756 times)

0 Members and 1 Guest are viewing this topic.


  • Guest
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.

Offline Donaldson Tan

  • Editor, New Asia Republic
  • Retired Staff
  • Sr. Member
  • *
  • Posts: 3177
  • Mole Snacks: +261/-13
  • Gender: Male
    • New Asia Republic
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

Sponsored Links