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### Changing concentration to change rate

Posted: Tue Mar 05, 2019 2:05 pm
How does changing the concentration of different species affect the rate of the reaction?

If a reactant has a coefficient of 1 and you double its concentration and the rate of reaction doubles then this is a first order reaction.
If a reactant has a coefficient of 1 and you double its concentration and it is a second order reaction, does this double because you do 2*2 or does it double because you do 2^2?

### Re: Changing concentration to change rate

Posted: Tue Mar 05, 2019 2:49 pm
If a reactant is second-order, this means that doubling that reactant will result in the rate being quadrupled. This is because the concentration of the reactant is to the second power. Therefore, if you double the concentration (multiply by 2), then the 2 is squared to give you rate that is quadrupled.

### Re: Changing concentration to change rate

Posted: Tue Mar 05, 2019 4:20 pm
Typically, reaction rates decrease with time because reactant concentrations decrease as reactants are converted to products. Reaction rates generally increase when reactant concentrations are increased.