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Let's do some practice problems for balancing chemical equations we'll start off with some examples that are pretty basic and straightforward and then the problems will get more challenging as we move on here's our first equation we got xenon and fluorine we want to keep track of how many atoms of these elements we have on both sides of the equation, so we're going to make a little chart okay I got xenon and fluorine on this side and then xenon and fluorine on this side over here I have one xenon atom one, and then I have f2, so I got two fluorine over here also one xenon and then f6, so I got 6 fluorine snow take a look at these numbers this equation isn't balanced yet because we have different numbers of the atoms for one of the elements I've got two fluorine here, but I've got six fluorine here, so it's not balanced in order to balance it I've got to add numbers or coefficients in front of one or more of these elements and compounds to change the number of atoms that I have on the different sides of the equation okay here's how I'm going to do I got six fluorine here, but I got two fluorine here so for this to balance I need more fluorine son the left side I can add a number in front of the f2 here if I put 3 in front of this f2 here we'll put it in I put 3 in front of this f2 now I have three times two gives me six fluorine, and now they balance one for the Xenon's 6 and 6 for the fluorine, so now this is a balanced equation by adding this number by adding this coefficient now really quick this is one very common question people often ask wait why did you put that 3 there couldn't you just change this 2 to a 6, and then it would also balance no no no no no no no no no you can't do that super common misconception you can't change these subscripts here you can't change them you can't add them, so you can't change this to a six you can't put a six here or anything like that the only thing you can do is you can put numbers in front of the elements or compounds okay, but you can't change or add the subscripts okay, so that's how you balance an equation let's do a bunch more practice okay so in this equation we've got three elements silver AG hydrogen H and sulfur s obviously we've got these on both sides of the equation okay so let's see how many atoms we have of each over here we got one AG we got h2, so we got two hydrogen atoms, and we have s, so we got one sulfur atom over here we have AG two, so we have two silvers here on sulfur we have one, and then we have h2, so we have two hydrogens okay what balances and what doesn't well the hydrogen's and sulfur both balance but the silver we have two here and one here we can fix it by adding a number or coefficient in front of one or more of these elements and compounds I need more silvers on this side, and luckily I can just put a two in front of this AG so now instead of having one AG now I have two, and now I got two and one it balances this equation is a little more challenging because we have...
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