Question

According to collision theory of reaction rates:
A.every collision between reactant molecules leads to a chemical reaction
B.rate of reaction is proportional to the velocity of the molecules
C.rate of reaction is proportional to the average energy of the molecules
D.rate of reaction is proportional to the number of collisions per second

Answer 1

To answer this question, you should recall the basic requirements of kinetics and collision theory. The basic concept involved is that the more frequent the reactant particles collide, the more often they react with one another and the faster the reaction rate.

Complete step by step answer:
The branch of chemistry dealing with the study of the rates of chemical reactions or how fast reactions occur is known as chemical kinetics. The basic requirement for any reaction to occur is that the reactants must collide and interact with each other in some way. This is the basis of the collision model which is the foundation of kinetics and collision.
According to collision theory, the rate of any reaction is proportional to the number of collisions between reactant molecules. This is following the collision model as more often reactant molecules collide, the more often they react with one another and the faster the reaction rate.

Hence, the correct answer is (D) as the rate of reaction is proportional to the number of collisions per second .

Additional Information:
In real reactions, only a small fraction of these collisions occur. Such collisions are known as effective collisions. Also, to produce an effective collision, reactant molecules must possess some minimum amount of energy. This energy, which is used to initiate the reaction, is termed as the activation energy.

Note:
For any reactant, there will be some of the particles that possess activation energy. The number of particles possessing the required activation energy is dependent on the temperature of the reactant molecules. Therefore, apart from the number of collisions per second other factors such as effective collisions, activation energy and temperature should be considered.