Question

Label the enthalpy changes shown in the diagram below. I need help with chemistry please.

Answer 1

This is the diagram that I need to label. I looked in my chm book to get an idea, but it wasn't helping. and my professor did not explain this at all.

Answer 2

hmm..
Solid -> Gas
This process is called "Sublimation"
The opposite of sublimation (solid -> gas) is deposition (gas -> solid)
\[\Delta H _{sublimation} = -\Delta H_{deposition}\]

Solid -> Liquid
This process is called "Fusion (Melting)" \[\Delta H_{fusion} = H_{liquid} - H_{solid} \]

Liquid -> Solid
This process is called "Solidification (Freezing)"
Note: this is the opposite process of fusion/melting and therefore, the enthalpy for the opposite process (freezing) will be exactly EQUAL but opposite in sign. \[\Delta H_{freezing} = H_{solid} - H_{liquid} \] \[= -\Delta H_{fusion}\]

Finally we have:
Liquid -> Gas
This process is called "Vaporisation" and the opposite process Gas -> Liquid
This process is called "Condensation"
\[\Delta H_{vaporisation} = -\Delta H _{condensation}\]

Answer 3

All you really need to know is the differences and changes in states and use the formulas and you'll be fine :)

Answer 4

Also note that phase changes are accompanied by energy and enthalpy changes.
- Vaporisation, melting and sublimation are ALWAYS ENDOTHERMIC, meaning that energy must be ABSORBED to overcome the intermolecular forces.

-Condensation, freezing and deposition are ALWAYS EXOTHERMIC, meaning that energy must be RELEASED as the molecules get closer and attract each other.

Heat of vaporisation \[\Delta H _{vap} \] - enthalpy change for the conversion of 1 mol of a substance from liquid to gas.

Heat of fusion \[\Delta H_{fus} \] - enthalpy change for the conversion of 1 mol of a substance from solid to liquid.

Heat of sublimation \[\Delta H_{sub}\] - enthalpy change for the conversion of 1 mol of a substance from solid to gas.

Answer 5

thank you for explaining :). does this look right to you? @butterflydreamer

Answer 6

no probleeem :).
Yeeeep, all of your answers are correct! Excellent job

Answer 7

thanks for helping .

Answer 8

no worries!

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