The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical Q present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical Q required to keep the reaction rate unchanged?	Pick one:	A) 100% decrease	B) 50% decrease	C) 40% decrease	D) 40% increase	E) 50% increase
Let Q and B be the concentratrations of the individual chemicals.   Rate of chemical reaction = Q^2/B   Since new B is increased by 100%   Rate = Q^2/(2B)   For the rate to be constant, new value of Q should be square root(2)   So new value of Q = 1.414Q   That means Q is increased by 41.4%   Nearest solution is 40% increase
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The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical Q present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100 percent, which of the following is closest to the percent change in the concentration of chemical Q required to keep the reaction rate unchanged?