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Rates of Reaction | Definitions
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Rates of Reaction | Definitions
Rate of Reaction
The change in the concentration of any reactant or product per unit time.
Instantaneous Rate of Reaction
The rate of change of a reactant or product at a particular time during the reaction.
Factors Affecting Reaction Rates
Temperature, concentration, particle size, nature of reactants and the presence of a catalyst.
Catalyst
A substance that alters the rate of a chemical reaction and which is chemically unchanged at the end of the reaction.
Activation Energy
The minimum energy colliding particles need to possess to cause a reaction.
Homogenous Catalysis
A system in which both the catalyst and the reactants are in the same phase or state.
Heterogenous Catalysis
A system in which the catalyst and the reactants are in a different phase or state.
Catalytic Poison
A substance that blocks the active site of the catalyst by bonding more strongly to the catalyst, e.g. lead is a catalytic poison in catalytic converters.
Limiting Agent
The reactant not present in excess.
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Rate of Reaction
The change in the concentration of any reactant or product per unit time.
Instantaneous Rate of Reaction
The rate of change of a reactant or product at a particular time during the reaction.
Factors Affecting Reaction Rates
Temperature, concentration, particle size, nature of reactants and the presence of a catalyst.
Catalyst
A substance that alters the rate of a chemical reaction and which is chemically unchanged at the end of the reaction.
Activation Energy
The minimum energy colliding particles need to possess to cause a reaction.
Homogenous Catalysis
A system in which both the catalyst and the reactants are in the same phase or state.
Heterogenous Catalysis
A system in which the catalyst and the reactants are in a different phase or state.
Catalytic Poison
A substance that blocks the active site of the catalyst by bonding more strongly to the catalyst, e.g. lead is a catalytic poison in catalytic converters.
Limiting Agent
The reactant not present in excess.