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Activation Energy

Posted: Sat Feb 20, 2016 6:18 pm
by Daniela Contreras 3E
So this might go back a couple of lessons but if on a Gibbs graph the products are lower than the reactants BUT there is a large activation energy what does this mean ?

Re: Activation Energy

Posted: Sat Feb 20, 2016 11:34 pm
by Aleck Sun 1J
Based on the graph, I think it means that you need a lot of free energy added to the reactants to get the reaction started, but once it reaches the peak of the graph (achieves activation energy), it releases a lot of energy, more than what it started out with in the first place (to get the products' free energy below the reactants). This indicates that it is an exergonic reaction.

Re: Activation Energy

Posted: Wed Mar 11, 2020 5:30 pm
by 005384106
Alternatively, when the products are at a higher point than the reactants then it is an exergonic reaction, but a large activation energy will mean that the reaction might be slower because the reaction requires more energy for the reaction to take place.

Re: Activation Energy

Posted: Wed Mar 11, 2020 6:18 pm
by AlyshaP_2B
Activation energy is the amount of energy needed for a specific reaction to occur. When energy input is needed, the reaction is endergonic, and when energy is released, the reaction is exergonic.

Re: Activation Energy

Posted: Wed Mar 11, 2020 9:11 pm
by Kallista McCarty 1C
Activation energy is the minimum amount of energy needed for a reaction to take place

Re: Activation Energy

Posted: Wed Mar 11, 2020 9:50 pm
by Micah3J
How exactly does a catalyst lower the activation energy of a reaction?

Re: Activation Energy

Posted: Wed Mar 11, 2020 9:51 pm
by Brooke Yasuda 2J
A catalyst weakens the bonds of the species, ensuring that less energy is required to obtain the necessary activation barrier energy. This is how the reaction rates of the forward and reverse reactions are increased.

Re: Activation Energy

Posted: Wed Mar 11, 2020 9:53 pm
by vibha gurunathan 1h
Catalysts create an alternate pathway - they speed up reactions by lowering Ea.