11. The rate of a reaction can be increased by all of the following except: A) i
ID: 304083 • Letter: 1
Question
11. The rate of a reaction can be increased by all of the following except: A) increasing the temperature. B) increasing the concentration of the reactants. C) increasing the surface area of the reactants. D) adding a catalyst E) increasing the volume of the reaction vessel. 12. When a chemical system has reached equilibrium A) B) C) the forward and reverse reactions have stopped. the ra the rate of the forward reaction is less than the rate of the reverse reaction. the rate of the forward reaction is equal to the rate of the reverse reaction. the equilibrium constant has reached a minimum. te of the forward reaction is greater than the rate of the reverse reaction. E)Explanation / Answer
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11)E
Increasing temp increases no of collsions by increasing kinetic energy, hence increase rate of reaction
Increasing concentration again brings the molecules or atoms in close proximity increasing number of collisions
Adding a catalyst decreases the energy barrier hence increasing the rate
Increasing the volume of the vessel will decrease reaction rate as the distance between molecules increases and hence rate of collision decreases too.
12)D at equilibrium the rates of forward and reverse reaction become the same .The reaction keeps going on and does not stop. The amount of reactant and product is not equal, it is just the point at which the rate of the reactions in opposite directions become same.
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