2. THe leau 3. I is a catalyst. a. 1 only b. 2 only c. 3 only d. 1 and 3 only 16

Question

2. THe leau 3. I is a catalyst. a. 1 only b. 2 only c. 3 only d. 1 and 3 only 16. When the concentrations of the reactants are increased, the rate of the reaction increases. This is best explained by a. an increase in the fraction of molecules that have enough energy to react. b. an increase in the frequency of the molecular collisions c. an increase in the rate constant. d. an increase in the kinetic energy of the molecules. e. an increase in the average potential energy of the molecules. aahloride reacts with oxygen at high temperatures to produce chlorine and carbonyl chloride. 1 101

Explanation / Answer

Answer: (b)

the best explained by an increase in the frequency of the molecular collision because according to collision theory of reactivity, reactions occur when reactant molecules ' effectively collide'. So, if we increase the concentration of reactants, the molecules of reactants also increase that means collision of molecules with each other also increase. which effectively increase the rate of reaction.

for 'a' option is possible if a reaction involving only one type of particles which have enough energy to react that means only if one reactant is involved in reaction and if we have more than 1 reactant then we have two different type of particles react, so this option does not explain the given statement clearly.

for 'd 'option - if we increase the kinetic energy of molecules, they will collide fastly and energy transfer between molecules take place and due to energy transfer molecules will cross-activation barrier of reactions. So increase in the concentration of reactants can't relate an increase in the fraction of molecules that have enough energy to react. because of the kinetic energy increase by increase in temperature of the reaction.

For c and e option - these two terms(rate constant and activation energy) are fixed for reaction. every reaction has fixed rate constant and activation energy, these terms do not depend on the concentration of reactants.

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