## activation energy/ energy barrier

Arrhenius Equation: $\ln k = - \frac{E_{a}}{RT} + \ln A$

Sarah Blake-2I
Posts: 153
Joined: Fri Aug 30, 2019 12:16 am

### activation energy/ energy barrier

What is the definition of activation energy/ an energy barrier and what is the importance of that energy? Does it have a numerical value?

MaggieHan1L
Posts: 100
Joined: Thu Jul 11, 2019 12:17 am

### Re: activation energy/ energy barrier

Activation energy is the amount of energy needed before a reaction could proceed. There is a numerical value and it's important because a larger activation energy tends to have a slower reaction. Also this is important when it comes to enzymes

Dina Marchenko 2J
Posts: 54
Joined: Thu Jul 25, 2019 12:16 am

### Re: activation energy/ energy barrier

Graphically, activation energy is the hump in between the reactants and products that must be overcome in order for the reaction to proceed. Both exo and endo reactions have an activation energy, and catalysts help to minimize this activation energy. It is a numerical value, yes.

Rory Simpson 2F
Posts: 106
Joined: Fri Aug 09, 2019 12:17 am

### Re: activation energy/ energy barrier

A reaction needs to reach the activation energy in order for the reactants to convert to products. You can calculate it numerically with the Arrhenius equation (which shows that it depends on the rate constant k and the temperature of the reaction).

Posts: 103
Joined: Sat Aug 17, 2019 12:18 am

### Re: activation energy/ energy barrier

According to the book, when you have a high activation energy, there is also high sensitivity of the rate constant to changes in temperature.

aishwarya_atmakuri
Posts: 101
Joined: Sat Jul 20, 2019 12:15 am

### Re: activation energy/ energy barrier

The activation energy is how much energy the reaction requires to proceed and this is for both endergonic and exergonic reactions. When there is not enough energy to overcome this barrier, the reaction will not proceed.

Robert Tran 1B
Posts: 118
Joined: Thu Jul 11, 2019 12:15 am

### Re: activation energy/ energy barrier

The activation energy is the amount of energy that is required initially for a reaction to occur. This value is important because it determines how likely a reaction is to occur, and therefore, how long it will take to occur.