Formulas - Chemical Kinetics

Vm = average velocity (mol / L / s)
concentration range (mol / L)
time variation (s, min)


Modulus is used because the result must be positive since there is no negative velocity.

Being the chemical reaction:

Being the chemical reaction:

A way to calculate, in the exothermic and endothermic reaction graphs, the activation energy and the activated complex energy. The change in enthalpy can also be calculated by enthalpy of reagents and enthalpy of products.


Catalyst Activation Energy

The catalyst increases the speed of the chemical reaction but does not participate in the reaction.
In the graphs, note that with the presence of the catalyst, the activation energy decreases.

To find the law of speed, use the following formula:

For a generic reaction we have:

V = reaction speed
K = velocity constant
A = molar concentration of A
B = molar concentration of B
X and Y = experimentally determined exponents

The law of velocity can also indicate the order of reaction and molecularity.

Tip: The law of speed is important because it determines the order of reaction. Knowing the order of reaction, one can predict what happens to the speed of a given chemical reaction when changing the concentration of one of the reagents.