VIEWS: 8 PAGES: 2 POSTED ON: 10/31/2011
Balancing Equations: You MUST know how to balance an equation or you can not do the math problems!! How to Balance Equations: Underneath the chemical equation draw a line straight down from the middle of the “yields” sign (the arrow). Now write each ELEMENT that you see on each side of the arrow in the same order and count them! Al 1 Al 1 Sn 1 Sn 1 Cl 2 Cl 3 Now choose an easy one to start balancing, for example Chlorine doesn’t match so what number is common between 2 & 3??? 6! So what can you do to get 6 Chlorine’s on each side of the arrow?? a. Add a 3 in front of the SnCl2 on the reactant side and add a 2 in front of the AlCl3 on the product side! Remember every time you add a coefficient in front of a compound it affects the entire compound! Al 1 Al 2 Sn 3 Sn 1 Cl 6 Cl 6 Check to see if the numbers on both sides match??? NO THEY DON’T! So how can you get them to be equal?? How about add a 2 in front of the Al on the reactant side and a 3 in front of the Sn on the product side??? Al 2 Al 2 Sn 3 Sn 3 Cl 6 Cl 6 The numbers on both sides MATCH YOU ARE DONE BALANCING!!! a. Your final answer should be: i. 2Al + 3SnCl2 3Sn + 2AlCl3 Now remember: you can only add coefficients (big numbers) you can not change the subscripts (little numbers) while balancing equations! Also: there is not set rule for getting it right the first time every time, it is completely trial and error so just keep trying! Start with numbers that will be easy to match and go from there. If it gets a little hard find common numbers between the elements to try and get them to match.
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