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#### exocytosis646

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##### Enthalpy Question help
« on: January 26, 2019, 08:42:42 AM »

The following would represent enthalpy (a change in potential energy)
a) When the surrounding air gets colder
b) When water temperature increases in a calorimeter
c) When an ice cube melts
d) When a beaker is heated with a Bunsen burner

This question has been very confusing. I believe the answer may be C since an ice cube melting is a spacial change which may be a change in potential energy. And the others represent temperature changes. But an ice cube melting could also represent a temperature change, so im not sure.
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#### chenbeier

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##### Re: Enthalpy Question help
« Reply #1 on: January 26, 2019, 08:57:09 AM »

A,B, C and D have temperature changes. Only C has an additional  change. Which one?
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#### exocytosis646

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##### Re: Enthalpy Question help
« Reply #2 on: January 26, 2019, 09:32:56 AM »

A,B, C and D have temperature changes. Only C has an additional  change. Which one?

A potential energy change. So c is the answer. Thanks
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#### chenbeier

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##### Re: Enthalpy Question help
« Reply #3 on: January 26, 2019, 10:05:16 AM »

The substance change from solid to liquid.
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#### Borek

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##### Re: Enthalpy Question help
« Reply #4 on: January 26, 2019, 10:20:12 AM »

But an ice cube melting could also represent a temperature change

Could it? Does the temperature change during the melting? Why is the enthalpy of fusion called a "latent heat"?
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#### mjc123

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##### Re: Enthalpy Question help
« Reply #5 on: January 28, 2019, 01:19:01 AM »

I don't get the question. All four involve a change in enthalpy. Have you quoted it correctly? Does it ask which involves a change of enthalpy without a change in temperature?
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