The rate of a certain chemical reaction is directly proportional to the square of the concentration of chemical A present and inversely proportional to the concentration of chemical B present. If the concentration of chemical B is increased by 100%, which of the following in closest to the % change in concentration of chemical A required to keep the reaction rate unchanged?
(A) 100% decrease (B) 50% decrease (C) 40% decrease (D) 40% increase (E) 50% increase
Answer: (D) 40% increase
can anybody explain? THANKS!!