Gen-Chem/O-Chem Chapter 4 (page 80)

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cponeres
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Joined: Sat Nov 25, 2017 7:58 pm

Gen-Chem/O-Chem Chapter 4 (page 80)

Post by cponeres » Tue Dec 04, 2018 9:54 pm

I need some help understanding this: "Spontaneity does not relate to the (rate) of the reaction, or the (speed) at which it progresses." At the end of the paragraph it mentions that "Spontaneous reactions can proceed either quickly or slowly." It seems as if the text is slightly contradictory.

Any help would be greatly appreciated. I am open to a student response (as well as a tutor).

Thanks,
Christos
NS_Tutor_Will
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Joined: Fri May 25, 2018 9:15 am

Re: Gen-Chem/O-Chem Chapter 4 (page 80)

Post by NS_Tutor_Will » Wed Dec 05, 2018 8:12 am

Hi Christos --

I'm not sure if I see the contradiction you mentioned -- could you clarify?

You can think of spontaneity as whether or not a reaction will proceed with or without an input of energy. Remember, spontaneity relates to ∆G. As it states in the book, spontaneity is not tied to rate. In other words, just because a reaction has a negative ∆G doesn't mean that that reaction will proceed rapidly. It certainly could, but it is by no means guaranteed. Thus, the language in the text: a spontaneous reaction could be fast, slow, or in between. Spontaneity doesn't relate to speed/rate.

I hope this helps!
cponeres
Posts: 4
Joined: Sat Nov 25, 2017 7:58 pm

Re: Gen-Chem/O-Chem Chapter 4 (page 80)

Post by cponeres » Wed Dec 05, 2018 4:05 pm

Thanks for the explanation.

It appeared contradictory at first, but after reading your response I now understand spontaneity.
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