At the beginning of Chapter 12 we talked about the concept of attractive forces. Attractive forces between molecule are what we believe lead to the formation of the liquid and solid phase.

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Give me some responses to the questions below and I'll give you some extra credit.

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Laboratory Section:

In the animation above we are going to review the trends in boiling point for several groups of similar substances. Before clicking the mouse to begin the movie, answer Question #1

1. Given the homologous series of the elements He, Ne, Ar and Kr predict the trend in boiling point.

2. Click the mouse to show the trend in boiling points for He, Ne, Ar and Kr. How would you explain the particular order of the boiling points?

3. Click the mouse again to show the trend in boiling points for CH4, SiH4, GeH4, and SnH4. How would you explain the particular order of the boiling points?

4. The next series is NH3, PH3, AsH3, and SbH3. Before clicking the mouse predict the trend in boiling points you would expect for this series.

5. The next series is HF, HCl, HBr, and HI. Before clicking the mouse predict the trend in boiling points you would expect for this series.

6. The last series is H2O, H2S, H3Se, and H2Te. Before clicking the mouse predict the trend in boiling points you would expect for this series.

7. What is interesting about the series beginning with NH3, H2O and HF, compared with the series beginning with CH4 and He?

8. Is there anything about this animation that you feel you do not understand? List your concerns/questions.