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# First Order Kinetics Reactions

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## Jennifer Kordash

on 10 January 2013

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#### Transcript of First Order Kinetics Reactions

Are you scared for your life?
Do you fear your children will have birth defects?
Are you afraid to go outside?
Have no fear! FONBs is here! Nuclear Bombs: They'll blow your mind A reaction where the concentration of one reactant determines the rate of the reaction. The reactant and rate are proportional; every time the reactant doubles, so does the rate. Compared to a second order reaction, when the reactant is doubled, rate is quadrupled. Rate Law What is a first order reaction? Rate=K [A] [B] a rate law for a first order reaction, would just contain one of the variables because the other would be 0 order.

Example: A is the first order because when the concentration doubles, so does the rate. B is 0 order, because when the concentration doubles, the rate remains constant. Rate Constant This is 'k' in the rate law. The rate constant varies in each reaction. This is to adjust for error in the reaction. To solve for 'k' use substitution with data given in the table. Reaction Mechanism The reaction mechanism is made up of at least two separate reactions, one is slow, and one is fast. The two reactions must add together and create the original reaction. The stoichiometry between the two reactions must agree. First Order in Real Life Airbags are a good example of first order kinetics in action. Airbags inflate when an NaN3 pellet is burned and nitrogen gas fills the nylon airbag. The airbag inflates at a rate of 150 to 250 mph in 40 milliseconds. First order kinetics would be the better choice in this case because it allows more control over the reaction. This is because the rate of reaction is directly proportional to the amount of NaN3. A second order reaction would cause the rate of inflation to quadruple causing the bag to inflate too fast and possibly burst. First Order Graphs The Obvious Choice After a crash course in first order reaction, it is clear that first order kinetics is the obvious choice when it comes to nuclear bombs. rate= k [A] [B] 1=k[.1]
1/.1=10
k=10/Ms rate=1
k=?
[A]=.1
[B]=1 so plug in the values... example: A+E-->C+D slow
D+B-->E fast