Writing and balancing equations for double replacement reactions

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Writing and balancing equations for double replacement reactions

Balancing chemical equations Video transcript - Balancing chemical equations is one of those concepts in chemistry that often confuses people. But I think we'll see that if we work through this carefully and methodically, and we also appreciate the art of balancing chemical equations, that it's actually not too bad.

So first of all, what is a chemical equation? Well this is a chemical equation right over here. It's describing a reaction. So if I take an atom of aluminum and I add it to a dioxygen molecule, so a molecule that has two oxygens with it, under the appropriate conditions they will react to form aluminum oxide.

And the aluminum oxide molecule has two aluminum atoms and three oxygen atoms. And so you might say, "Okay, well what's "the balancing business all about?

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For example, right over here on the left-hand side, how many aluminums do we have? Well on the left-hand side, we have one aluminum. How many do we have on the right-hand side? Well on the right-hand side, we have two aluminums. And so aluminum just can't appear out of thin air by virtue of some magical reaction.

writing and balancing equations for double replacement reactions

You have to have the same amount of aluminums on both sides, and the same thing is true for the oxygens. Over here on the left-hand side, we have two oxygens.

They form one dioxygen molecule that has two oxygen atoms. And then over here in the aluminum oxide molecule, we have three. We have three oxygen atoms. So once again, we can't just have miraculously an oxygen atom appear out of nowhere.

So we have to balance the number of aluminums on both sides, this number and this number should be the same, and we have to balance the number of oxygens, this number and that number should be the same. So how do we do that? Well one thing might be to say, "Okay, if I've got "two aluminums here and I have one aluminum here, "well why don't I just double the number "of aluminums right over here?

I now have two aluminums, and so it looks like the aluminums are balanced, and they are indeed balanced.

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But still we have an issue with the oxygens. Over here I have two oxygens. Over here I have three oxygens. So one thing that you might say is, "Okay, well how do I go from two to three?Click to share on Google+ (Opens in new window) Click to share on Pinterest (Opens in new window) Click to share on Twitter (Opens in new window).

describe what you should take into account when writing and balancing double replacement reaction equations 1. predict what the products could be 2.

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