FAIRSpectra - Enabling the FAIRification of Analytical Science
Factors that affect Reaction Rates
1.
2. Chemical Change
Occur when a substance
combines with another to
form a new substance.
Not reversible except by
further chemical reaction.
3. Reaction Rate
- is the speed at which reactants are
converted into products and the rate which
chemical reaction proceeds.
4. Collision Theory
Is based on the assumption that for a
reaction to occur it is necessary for the
reacting species (atoms or molecules) to
come together or collide with one another.
5. Activation energy, 𝐸𝑎
Serves as an energy barrier that
reactant molecules must overcome to
be converted to the products.
The lower the energy barrier, the
easier it is to form the products.
6.
7. Legend:
Energy of Reactants = 𝐸𝑅
Activation energy = 𝐸𝑎
Energy Activated Complex = 𝐸𝐴𝐶
Energy of the products = 𝐸𝑃
9. Nature of Reactants
Individual properties also affect
reaction rates.
Reactants in Liquid and Gas phase
reacts faster than the reactants of
Solid.
10.
11. Effect of Temperature
According to Kinetic Molecular Theory “as the
temperature increases, the average kinetic
energy of molecules also increases.
It also increases the frequency of collisions.
If the temperature of the reacting system is
increased, the reaction also increases.
12.
13. Effect of Concentration of Reactants
If the concentration of the reactant is
increased the reactant particles
become more crowded.
14.
15. Surface Area
Is the exposed matter of a solid substance.
The rate of reaction of a solid substances is
related to its surface area.
Smaller reactant particles provide a greater
surface area which increase the chance for
collision.
The higher the surface area, the faster the
reaction rate.
16.
17. Presence of Catalyst
A Catalyst is a substance that increase the
rate of reaction without being used up or
permanently changed.
It lowers the activation energy.