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How do I solve this rate law problem?

A reaction has the experimental rate law of  rate=k [A]^2
 
A. What happens to the rate if the concentration of A is tripled?
 
B. What happens to the rate if the concentration of A is  reduced to one third the inital concentration?
 

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Emily M. | University of Rochester Grad for Math and Science TutoringUniversity of Rochester Grad for Math an...
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If you triple the concentration of A, the rate will increase by a factor of 3^2 or 9. 
If you reduce the concentration of A to 1/3 the rate will decrease by a factor of (1/3)^2 or 1/9.