Catalyst

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Dominique Zuk 1G
Posts: 20
Joined: Wed Sep 21, 2016 2:58 pm

Catalyst

Postby Dominique Zuk 1G » Sun Feb 19, 2017 8:02 am

I know that a catalyst speeds up a reaction, but on the molecular level how does it do this ?

Sophia Eliopulos 2I
Posts: 21
Joined: Wed Sep 21, 2016 2:56 pm

Re: Catalyst

Postby Sophia Eliopulos 2I » Sun Feb 19, 2017 11:38 am

Catalysts work by providing an alternative reaction pathway for the breaking and remaking of bonds. The activation energy for this new pathway is often less than the activation energy of the normal pathway. When a catalyst is present, one of the reactants reacts with the catalyst to form an intermediate product which then reacts with the other reactant to form the final product. The activation energies of both these steps is lower than the activation energy without the presence of a catalyst, therefore more molecules will have the energy to react using the catalyst ( the rate of reaction is increased ).

804748473
Posts: 21
Joined: Fri Oct 07, 2016 3:02 am

Re: Catalyst

Postby 804748473 » Tue Feb 21, 2017 10:59 pm

Could someone outline the information we need to know about catalysts because I could not find it in the course reader

tasmia_amjad_3K
Posts: 10
Joined: Wed Sep 21, 2016 2:56 pm

Re: Catalyst

Postby tasmia_amjad_3K » Tue Feb 28, 2017 10:58 pm

Page 76 in the course reader is pretty helpful when it comes to important information about catalysts.

704647747
Posts: 28
Joined: Fri Sep 25, 2015 3:00 am

Re: Catalyst

Postby 704647747 » Wed Mar 01, 2017 12:17 am

804748473 wrote:Could someone outline the information we need to know about catalysts because I could not find it in the course reader


page 84 also has a little bit of information on catalysts and free energy (activated complex theory).

Jose_Arambulo_2I
Posts: 35
Joined: Wed Sep 21, 2016 2:59 pm

Re: Catalyst

Postby Jose_Arambulo_2I » Wed Mar 01, 2017 2:25 am

Furthermore, a catalyst lowers the free energy of activation by lowering the energy required to break bonds (decreases standard enthalpy of activation) and puts the reactants closer together and in their correct orientations (increases standard entropy of activation).

Justin Yu 3H
Posts: 36
Joined: Fri Sep 29, 2017 7:07 am

Re: Catalyst

Postby Justin Yu 3H » Mon Mar 05, 2018 3:48 pm

Jose_Arambulo_2I wrote:Furthermore, a catalyst lowers the free energy of activation by lowering the energy required to break bonds (decreases standard enthalpy of activation) and puts the reactants closer together and in their correct orientations (increases standard entropy of activation).

How does that increase the standard entropy of activation?


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