Questions tagged [spontaneity]

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1answer
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True or false: "If a reaction has a large negative value of ∆G, then it will be a fast reaction."

I recently took a Gen. Chem. 2 exam that contained this question. I answered false, as I knew that thermodynamics and kinetics are separate matters. My professor said the answer is true. I pressed him ...
1
vote
0answers
23 views

Does this coupled reaction actually happen (decomposition of calcium carbonate)

I found the following example of a coupled reaction to drive the decomposition of calcium carbonate. I get the calculation part of it, that the changes in Gibbs energy sum to a negative amount. But ...
3
votes
5answers
1k views

What is an example of an exothermic reaction with negative ∆S?

In high school we learn that when a reaction has both negative $\Delta{}S$ (entropy change) and negative $\Delta{}H$ (enthalpy change) it occurs spontaneously at lower temperatures, but becomes non-...
2
votes
0answers
25 views

How do the qualitative driving forces of a reaction make the reaction proceed?

In high school chemistry, I learned that there are 4 “qualitative driving forces” that cause aqueous reactions to proceed: Forming a solid (precipitate) Forming a liquid Forming a gas Transferring ...