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CHEM 1500, Week 8

by: D Holley

CHEM 1500, Week 8 CHEM 1500

Marketplace > Ohio University > Chemistry > CHEM 1500 > CHEM 1500 Week 8
D Holley

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Almost forgot this week. Fun with stoichiometry!
Concepts in Chemistry
Corey Beck
Class Notes
General Chemistry
25 ?




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This 2 page Class Notes was uploaded by D Holley on Saturday October 15, 2016. The Class Notes belongs to CHEM 1500 at Ohio University taught by Corey Beck in Fall 2016. Since its upload, it has received 5 views. For similar materials see Concepts in Chemistry in Chemistry at Ohio University.


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Date Created: 10/15/16
Week 8  CHEM 1500 10/11 & 10/13 This week we covered balancing equations (reactions) and limiting reactants. These two  techniques are very similar.  So, before we can balance an equation (reaction) we have to understand what one is.  The left side of the arrow are the reactants, the arrow means yield and the right side of the arrow  are the products.  We use subscript letters (g, s, l, aq) to say the state of matter of each of our reactants and our  products.  The reason we have to balance these equations (reactions) is because of the Law of Mass  Conservation. The Law of Mass Conservation simply states that what is on the left side of the  equation (reaction) has to equal what is on the right side of the equation (reaction).  To make sure what’s on the left is the same on the right we use stoichiometric coefficients to  balance the elements on each side of the equation (reaction). Stoichiometric coefficients are  multiplied to the entire molecule they are placed in front of. The allow us to convert between  moles of different elements in the equation (reaction).  There is a procedure Dr. Beck goes through to help him balance the equation (reaction) the most  efficient way possible. He splits the equation (reaction) between the reactants and the products,  then he rights out each element or polyatomic ion on both sides; if they are not the same on both  sides the equation (reaction) you have is incorrect.  PRACTICE makes PERFECT! Now: limiting reactants. This is another way to make sure the equation (reaction) is balanced and make for easy calculations if you are well at it.  Dr. Beck refers to limiting reactants as the realistic way of doing stoichiometry.  The element that runs out first will be the limiting reactant because if your making something  that requires multiple parts, once you run out of one of the parts do you continue making the  product? Think of yourself as a manufacturing engineer. You are required to manufacture 2 million  bicycles by next Friday, but you only have so many bicycle parts.  You have 8 million bicycle wheels, 3 million bicycle frames and 5 million bicycle handlebars. So, our equation is 1 frame + 1 handlebar + 2 wheels = 1 bicycle. If we have 8 million bicycle wheels, how many bicycles will that make? 8 million wheels (1 bicycle/2 wheels) = 4 million bicycles. If we have 3 million bicycle frames, how many bicycles can be made? 3 million frames (1 bicycle/1 frame) = 3 million bicycles. If we have 5 million bicycle handlebars, how many bikes can we make? 5 million handlebars (1 bicycle/1 handlebar) = 5 million bicycles.  All of our supplies can create a different amounts of bicycles, but we can only create bicycles  until we run out of one set of materials. We run out of bicycle frames first because we can only  create 3 million bicycles with the amounts of frames we have.  Limiting = Lowest and instead of bicycles we’ll be making molecules.  Again, PRACTICE makes PERFECT! Enjoy your weekend 


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