Factors Influencing Rate of a Reaction
Examines how the concentration of reactants, temperature, and the presence of a catalyst affect the rate of a chemical reaction.
What is Factors Influencing Rate of a Reaction?
The change in concentration of a reactant or product per unit time.
Key points
- Identify factors that affect the rate of a chemical reaction.
- Explain how each factor influences the reaction rate.
- Differentiate between effective and ineffective collisions.
- Understand the role of activation energy and catalysts.
Common exam trap
Confusing rate of reaction with equilibrium.
Definitions
- Term
Rate of Reaction
- Meaning
The change in concentration of a reactant or product per unit time.
- Term
Activation Energy (Ea)
- Meaning
The minimum amount of energy required for reactant molecules to undergo a chemical reaction.
- Term
Catalyst
- Meaning
A substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change.
- Term
Effective Collision
- Meaning
A collision between reactant molecules that leads to the formation of products; requires sufficient energy (activation energy) and proper orientation.
Learning objectives
Identify factors that affect the rate of a chemical reaction.
Explain how each factor influences the reaction rate.
Differentiate between effective and ineffective collisions.
Understand the role of activation energy and catalysts.
Prerequisites
Basic understanding of chemical reactions
Concept of collision theory
Kinetic energy of molecules
Common mistakes
Confusing rate of reaction with equilibrium.
Assuming temperature increase always doubles the rate (rule of thumb is not universally true).
Not considering the physical state of reactants.
Misunderstanding the role of a catalyst (it is not consumed).
Forgetting that only effective collisions lead to a reaction.
Keywords
Reaction Rate
Collision Theory
Concentration
Temperature
Catalyst
Activation Energy
Physical State
Surface Area
Practice preview
For a reaction A + B → Products, the rate law is Rate = k[A]¹[B]². If the concentration of A is doubled and the concentration of B is halved, the new rate will be:…
hard
How does an increase in temperature generally affect the rate of a chemical reaction?…
easy
For a given reaction, increasing the concentration of reactants usually leads to:…
easy