Test 2 Question 7






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Amy Dinh 1A
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Joined: Fri Sep 28, 2018 12:23 am

Test 2 Question 7

Postby Amy Dinh 1A » Fri Mar 15, 2019 10:13 pm

Can someone explain why cooling a hot cup of coffee after it was brewed spontaneous (delta G < 0) when melting ice is also spontaneous?

skyeblee2F
Posts: 62
Joined: Fri Sep 28, 2018 12:23 am

Re: Test 2 Question 7

Postby skyeblee2F » Fri Mar 15, 2019 10:23 pm

In both instances, they are approaching equilibrium with their surrounding temperature. It would require no input of energy for a cup of hot coffee to cool down (when it is hotter than its outside environment) or an ice cube to heat up (when it is cooler than its outside environment). Thus, both are spontaneous.

riddhiduggal
Posts: 30
Joined: Fri Sep 28, 2018 12:21 am

Re: Test 2 Question 7

Postby riddhiduggal » Fri Mar 15, 2019 10:39 pm

They are both spontaneous because they are both approaching equilibrium.

Anish Natarajan 4G
Posts: 34
Joined: Thu Jul 25, 2019 12:16 am

Re: Test 2 Question 7

Postby Anish Natarajan 4G » Sun Feb 02, 2020 10:19 pm

a cup of coffee is an open system in that the external temperature of the surroundings can affect the internal temperature of a system. A hot cup of coffee that exists in an area where the surrounding temperature is colder will allow for the heat transfer from the system to the surroundings.


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