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Determining Order

Posted: Thu Mar 01, 2018 10:47 pm
by Paula Dowdell 1F
Can someone explain to me how to determine what kind of order a reaction is? Thanks.

Re: Determining Order

Posted: Thu Mar 01, 2018 10:55 pm
by DianaTrujillo2K
To determine the order of the overall reaction you add the orders of the reactants.

Re: Determining Order

Posted: Thu Mar 01, 2018 11:42 pm
by Lucia H 2L
How do you find orders of the reactants?

Re: Determining Order

Posted: Thu Mar 01, 2018 11:45 pm
by Mika Sonnleitner 1A
The order of the reactants should be given in the problem in some form. The problem will either explicitly state "first order reactant" and "second order reactant", or give some other type of information that would help you determine the order. For example, the problem could state that the graph of ln(concentration) vs. time is linear, so you can determine that the reactant is first order. Additionally, the problem could give you units of k, which helps determine the order of the reaction. Overall, the problem would have to give you some sort of indication as to what the order of the reactants are.

Re: Determining Order

Posted: Fri Mar 02, 2018 1:14 am
by Hena Sihota 1L
Additionally, example 15.2 in the textbook explains how to find the order of the reactants and the order of the overall reaction if you're given a table of experimental data.

Re: Determining Order

Posted: Fri Mar 02, 2018 1:23 am
by Xin He 2L
Page 619 includes a lot of helpful information on the orders of the reactions.

Re: Determining Order

Posted: Fri Mar 02, 2018 1:19 pm
by Emily Mei 1B
The first few homework problems are also solid practice for determining reaction order.

Re: Determining Order

Posted: Fri Mar 02, 2018 5:29 pm
by 404995677
I think a good way to start is to create a graph if you are given a chemical equation and different experimental data.
rateex.jpg
like this one.

Then, you use the data (like we did in class) to determine the reaction order of each reactant.

Re: Determining Order  [ENDORSED]

Posted: Fri Mar 02, 2018 7:12 pm
by Mitch Walters
You have to to experiment by looking at how much the rate changes from your initial amount. If it changes by double it is a first order. If it quadruples it is second order. The important thing to note is that it has nothing to do with the coefficients of your chemical equation.