Question:
Threshold energy is equal to
Threshold energy is equal to
Updated On: Jul 7, 2022
- activation energy
- activation energy - energy of molecules
- activation energy + energy of molecules
- None of these.
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The Correct Option is C
Solution and Explanation
According to the collision theory, only a small fraction of collisions is effective in bringing about the chemical reaction and the rest of the collisions are ineffective.
For effective collision (to yield product), the colliding molecules must have more than or equal to a certain minimum amount of energy called threshold energy.
Threshold energy $=$ Activation energy $+$ Average kinetic energy of the molecules.
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Notes on Rate of a Chemical Reaction
Concepts Used:
Rate of a Chemical Reaction
The rate of a chemical reaction is defined as the change in concentration of any one of the reactants or products per unit time.
Consider the reaction A → B,
Rate of the reaction is given by,
Rate = −d[A]/ dt=+d[B]/ dt
Where, [A] → concentration of reactant A
[B] → concentration of product B
(-) A negative sign indicates a decrease in the concentration of A with time.
(+) A positive sign indicates an increase in the concentration of B with time.
Factors Determining the Rate of a Reaction:
There are certain factors that determine the rate of a reaction:
- Temperature
- Catalyst
- Reactant Concentration
- Chemical nature of Reactant
- Reactant Subdivision rate