Question

How can the rate of reaction be decreased?

Answer 1

Hint: The branch of physical chemistry which determines the rate of the reaction is known as chemical kinetics. Rate of the reaction is related to the speed. The rate determines the speed of the reaction that is how fast or slow is the reaction.

Complete answer:
- The change in the concentration of the reactants and products affect the rate of the reaction. During the reaction, concentration of the reactants decreases while the concentration of the products decreases.
- There are various factors that affect the rate of the reaction. These include the concentration of the reactants, the pressure of gaseous reactants, size of the solid reactant, temperature, etc.
- As the temperature decreases, the activation energy of the molecules decreases which leads to a decrease in the collision between the reacting molecules, and hence the rate of the reaction decreases.
- The change in pressure changes the concentration of the species. As pressure decreases, the collision between the gas molecules also decreases hence, the rate of the reaction also decreases.
- As the concentration of the reactants decreases, a collision between the reactant molecules also decreases, and hence the rate of the reaction decreases.
- The solid reactants in powdered form possess more rate of reaction. As the surface area of the reactant decreases the rate of the reaction decreases.

Note:
The rate of the reaction is important to determine the speed of the reaction. The unit of the rate of the reaction is the concentration per unit time. If the concentration is in molar and time is on seconds, then the unit of the rate is molar per second.