Chapter 21, Problem 2STP

Interpretation Introduction

Interpretation:

The option needs to be selected that does not affect the reaction rate.

Concept introduction:

The reaction rate is defined as the speed at which a chemical reaction proceeds.

Answer to Problem 2STP

The correct option is (d): reactivity of products.

Explanation of Solution

Reason for correct option:

The reactivity of reactant molecules affects the rate of reaction as some molecules are very reactive whereas some are inert in nature. The reactivity of products does not affect the rate of reaction. Hence, the correct option is (d): reactivity of products.

Conclusion

Reason for incorrect options:

Option (a): catalysts provide an alternate reaction pathway to obtain products that means catalysts increases the reaction rate by lowering the activation energy.

Option (b): surface area of reactants affects the rate of reaction; the rate of reaction increases with increase in surface area that allows more collisions to occur.

Option (c): With increase in concentration of reactants, the rate of reaction increases as higher concentration of reactant will results in more collisions between the reactants.