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activation energy/ energy barrier

Posted: Sat Mar 07, 2020 10:22 pm
by Sarah Blake-2I
What is the definition of activation energy/ an energy barrier and what is the importance of that energy? Does it have a numerical value?

Re: activation energy/ energy barrier

Posted: Sat Mar 07, 2020 11:03 pm
by MaggieHan1L
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

Re: activation energy/ energy barrier

Posted: Sun Mar 08, 2020 12:41 pm
by Dina Marchenko 2J
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.

Re: activation energy/ energy barrier

Posted: Sun Mar 08, 2020 1:37 pm
by Rory Simpson 2F
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).

Re: activation energy/ energy barrier

Posted: Sun Mar 08, 2020 2:33 pm
by Aarja Pavade 1H
According to the book, when you have a high activation energy, there is also high sensitivity of the rate constant to changes in temperature.

Re: activation energy/ energy barrier

Posted: Sun Mar 08, 2020 2:41 pm
by aishwarya_atmakuri
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.

Re: activation energy/ energy barrier

Posted: Sun Mar 08, 2020 2:42 pm
by Robert Tran 1B
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.