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Ch400Ch3LN1 - ¥ Look at the rules on your handout ¥ So...

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Chem 400 Chapter 3 Lecture Notes Part 1 Balancing Chemical Equations ¥ The Law of Conservation of Mass means that atoms are conserved in a chemical reactions. ¥ So if you start with 145 C atoms and 356 H atoms, you must finish with 145 C atoms and 356 H atoms. ¥ First of all, look at the following equation: ¥ The reactants are on the left (and what do you think the (l) means), and the products are to the right of the arrow. ¥ Note: how do we designate a gas, liquid, solid, or aqueous solution? ¥ Now count how many C atoms are on the left and how many are on the right? Do we have the same number? ¥ Wow, I&ve created matter!
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Unformatted text preview: ¥ Look at the rules on your handout: ¥ So when you balance an equation, there’s a couple of very important things to remember: ¥ When balancing, you may NOT change the correct chemical formulas, you use coefficients in front of the compound to add atoms. For example, H 2 O is water so you can’t change the formula to H 2 O 2 to add an oxygen atom as it’s no longer water! ¥ Coefficients go in front of the chemical formula, do not put coefficients inside a formula. For example, say you have Mg 3 (PO 4 ) 2 and you want to have 4 P instead of 2. You can’t do this: Mg 3 2(PO 4 ) 2 as you are putting it inside the chemical formula. Instead, you must do this: 2Mg 3 (PO 4 ) 2 . ¥ Here’s an example:...
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