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# Temperature and Free Energy

## Discusses the relationships between temperature and free energy in chemical equilibria.

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Practice Temperature and Free Energy
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Estimated10 minsto complete
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Kelvin 506

### ­­­­­­Kelvin 506

Credit: James Lee
Source: http://www.flickr.com/photos/jronaldlee/6319849827/

I would guess you’ve never read a book by the title of “Kelvin 506”. Interestingly, it has been proposed that this is the temperature at which paper experiences auto-ignition – it spontaneously combusts!

#### Why It Matters

• The temperature matters a lot for some reactions (Have you ever tried to cook an egg at room temperature?). When the products of a reaction are not favored or when a reaction cannot occur, the reaction is deemed non-spontaneous. Changing the temperature can render processes spontaneous (note: this does not always mean you should increase the temperature; some processes are only spontaneous at lower temperature – think freezing water.)
• Credit: Andrew Malone
Source: http://www.flickr.com/photos/andrewmalone/944345776/

Frying an egg requires the constant application of heat to the pan. Simply raising the temperature of the pan to a specific temperature will not work. The egg will start frying, and quickly stop when the temperature drops [Figure2]

• For more on this, watch the following video:

#### Can You Apply It?

1. The sign of G\begin{align*}\triangle G\end{align*} (positive or negative) determines if a reaction is spontaneous or non-spontaneous. SinceG=HT(S)\begin{align*}\triangle G=\triangle H-T(\triangle S)\end{align*} it is possible for G\begin{align*}\triangle G\end{align*} to be negative at all possible temperatures. When is this the case?
2. Not all paper auto-ignites at 506 K. Please provide some reasons that this might be the case.

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