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September 1, 2014

Homework Help: Chemistry

Posted by . on Thursday, January 21, 2010 at 8:01pm.

4 super tough chemistry questions:

1.) Water has a considerably higher boiling point and lower vapor pressure than other molecules of similar or larger molar mass. For example, dinitrogen (N2), methane (CH4), etc. all have lower boiling points and higher vapor pressures than water at the same temperature. How might this be explained?

2.) If the intermolecular forces between molecules of a substance were very small, what effect would you expect this to have on the boiling point and vapor pressure of the substance? What properties would you look for in a molecule in order to have a low boiling point and high vapor pressure? Should the atoms of the molecules be large or small? Why might this matter? Give two or three examples of molecules where you might expect the intermolecular forces to be very small.

3.) Why would contact with steam at 100 C produce a more severe burn than contact with liquid water at the same temperature?

4.) Orange growers often spray water on their trees to protect the fruit in freezing weather. Explain how the energy of the water --> ice phase transition could provide protection from freezing weather.

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