Test 2 Q 7 [ENDORSED]
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Test 2 Q 7
Why is the change in Gibbs free energy negative when ice melts? Isn't it gaining heat or in other words, isn't delta H positive?
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Re: Test 2 Q 7 [ENDORSED]
Although deltaH is positive, deltaS is also positive (water is less orderly than ice), and deltaS*T is probably a greater value than deltaH which makes deltaG=deltaH-TdeltaS negative
Re: Test 2 Q 7
Because the outside environment is providing that heat directly, making this a naturally occurring reaction, no extra energy must be put in to make this reaction occur, so it is spontaneous.
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Re: Test 2 Q 7
Just think about it conceptually -- the melting of ice is spontaneous in most temperatures, so deltaG should be negative.
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Re: Test 2 Q 7
the situation is spontaneous bc there's nothing else that needs to be done to the ice in order to melt it
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