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Topic: Writing Equations  (Read 4195 times)

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Offline prettyinpink

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Writing Equations
« on: September 07, 2008, 01:56:37 PM »
Hi everyone, Okay i am having trouble.
There is an example in my chemistry work book that looks like this:
(Mass-mass problem)
What mass of Al(OH)3 can be obtained by reacting 25.0g Al4C3 with water?
     1. (write balanced eq'tn) Al4C3 + 12H20 --> 3CH4 + Al(OH)3

I know how to balance the equation...but I dont know how to do the equation in order to balance it. I realize that first (like it says) Al4C3 + H20 are the reactants, i obviously know how to get those, but I do not know how they are getting the CH4 as the first product. Can anyone please explain this?

Offline Borek

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Re: Writing Equations
« Reply #1 on: September 07, 2008, 03:06:51 PM »
I dont know how to do the equation in order to balance it.

Do you mean "how to predict products"?
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Offline prettyinpink

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Re: Writing Equations
« Reply #2 on: September 07, 2008, 03:42:05 PM »
yes haha, sorry.

Offline Controlled Substance

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Re: Writing Equations
« Reply #3 on: September 07, 2008, 06:09:12 PM »
This skill will come to you as you become more and more familiar with different types of reactions and the chemical properties of elements.

http://misterguch.brinkster.net/6typesofchemicalrxn.html

Offline dabaichi

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Re: Writing Equations
« Reply #4 on: September 08, 2008, 04:58:00 PM »
Most cases when their are two reactants, the type of reaction is either combination or double replacement. For your chemical equation, it's clearly double replacement:
AB + CD -> AD + CB where A and C are potential cations and B and D are potential anions.

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