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Intermolecular Forces Lab

Last updated about 5 years ago
16 questions

Procedure

  1. Visit the comparing attractive forces simulation above.
  2. From the dropdown menu “select a pair of molecules” choose “pull apart Br2 and Br2.”
  3. Predict how difficult it will be to pull apart the two molecules in the data table below (column 1).
  4. Using the green star, move one Br2 away from the other. Comment on how easy or difficult this was in the data table below (column 2).
  5. From the dropdown menu, choose “pull apart H2 and H2.”
  6. Predict how difficult it will be to pull apart the two molecules in the data table below.
  7. Using the green star, move one H2 away from the other. Comment on how easy or difficult this was in the data table below.
  8. From the dropdown menu, choose “pull apart HBr and HBr.”
  9. Predict how difficult it will be to pull apart the two molecules in the data table below.
  10. Using the green star, move one HBr away from the other. Comment on how easy or difficult this was in the data table below.
  11. From the dropdown menu, choose “pull apart Br2 and HBr.”
  12. Predict how difficult it will be to pull apart the two molecules in the data table below.
  13. Using the green star, move Br2 away from HBr. Comment on how easy or difficult this was in the data table below.
10

Data

Fill out the information in the first two columns based on your interaction with the simulation.

In the last two columns, determine whether the molecules are polar or nonpolar and identify the type of intermolecular forces the molecules exhibit.

5

Analysis

Explain why you classified the intermolecular forces the way you did between Br2 & Br2 taking into account polarity.

5

Explain why you classified the intermolecular forces the way you did between H2 & H2 taking into account polarity.

5

Explain why you classified the intermolecular forces the way you did between HBr & HBr taking into account polarity.

5

Explain why you classified the intermolecular forces the way you did between Br2 & HBr taking into account polarity.

5

If you had samples of HBr(aq) and Br2(l) in real life and you mixed them together, would you expect them to mix or separate into two layers? Explain.

10

If HF was used in the simulation instead of HBr, how easy or difficult would it be to separate the molecules? What kind of polarity and IMFs would the molecules experience? Complete the following data table with your predictions:

5

Explain your IMF classifications, taking into account polarity.

How would you expect HF’s boiling point to compare to HBr? Explain. You can use the Molecular Workbench simulation Boiling Point to help you.

10

If F2 was used in the simulation instead of Br2, how easy or difficult would it be to separate the molecules? What kind of polarity and IMFs would the molecules experience? Complete the following data table with your predictions:

5

Explain your IMF classifications, taking into account polarity.

How would you expect F2’s boiling point to compare to Br2? Explain.

5

How would you expect HBr’s boiling point to compare to Br2? Explain.

5

Consider the familiar compound water (H2O). How would water’s boiling point compare to HBr and HF? Explain.

5

Look up the boiling points of H2O, Br2, F2, HBr, and HF. Were your predictions correct? Explain.

5

Of the two original compounds you investigated in the simulation (HBr and Br2), which would be soluble in water? Explain.

5

Rank the vapor pressures of water, HBr, and HF from lowest to highest. Explain.

10

Conclusion

When considering physical properties, are IMFs the only factor to consider? Explain.