# reaction rateZoomA-Z

The reaction rate defines how fast or slow a chemical reaction takes place. The rate is expressed as the actual, i.e. the rate at a particular instant of time, change of concentration per unit of time based on stoichiometric turnover. For the reaction

$νAA+νBB+…→νPP+νQQ+…$

the reaction rate relates to reaction-based concentration changes as follows:

$r=-1νAd[A]dt=-1νBd[B]dt=…=+1νPd[P]dt=+1νQd[Q]dt=…$

## Recommended Learning Units

### SN/E Competition - Role of the Temperature20 min.

#### ChemistryOrganic ChemistrySubstitution Reactions

First, this learning unit describes the mechanistic reasons for the competition of elimination and nucleophilic substitution. Then, the influence of the reaction temperature on the SN2/E2 competition as well as the SN1/E1 competition is discussed.

### SN/E Competition - SN1/E1 Competition30 min.

#### ChemistryOrganic ChemistrySubstitution Reactions

First, this learning unit describes the mechanistic reasons for the competition of elimination and nucleophilic substitution. Then, the different parameters that influence the SN1/E1 competition are discussed. After working through the learning unit, one should be able to predict, depending on given parameters, the predominant mechanism of a reaction or to choose the parameters of a reaction, so that a mechanism desired actually mainly occurs, respectively.

### SN/E Competition - SN2/E2 Competition40 min.

#### ChemistryOrganic ChemistrySubstitution Reactions

First, this learning unit describes the mechanistic reasons for the competition of elimination and nucleophilic substitution. Then, the different parameters that influence the SN2/E2 competition are discussed. After working through the learning unit, one should be able to predict, depending on given parameters, the predominant mechanism of a reaction or to choose the parameters of a reaction, so that a mechanism desired actually mainly occurs, respectively.

### SN/E Competition (overall)90 min.

#### ChemistryOrganic ChemistrySubstitution Reactions

First, this learning unit describes the mechanistic reasons for the competition of elimination and nucleophilic substitution. Then, the different parameters that influence the SN2/E2 competition as well as the SN1/E1 competition are discussed. After working through the learning unit, one should be able to predict, depending on given parameters, the predominant mechanism of a reaction or to choose the parameters of a reaction, so that a mechanism desired actually mainly occurs, respectively.