Last modified: Wed 03/09/2016 10:32:03 am
ACA

Oklahoma State University

It is OK to use your textbook or lecture notes from class, but if you can answers the questions without it that is OK too.

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Answer all of the questions below. If you do not know an answer enter CNA. However, it will help me the most if you answer each question with your best intuition/idea about what would be a reasonable answer.


First Name:

Last Name:

Laboratory Section:

1. Identify all the intermolecular attractive forces that occur in the liquid phase of each of the following substances. (NOTE: You may want to practice predicting types of intermolecular attractive forces using the IMF activity I have developed before answering these questions.)

a) H2SO4

b) CHF3

c) HOCH2CH2OH

d) BrF3

2. For each of the molecules in Q1 indicate the most important intermolecular attractive force (i.e. the IMF that will make the largest contribution to attractions between the molecules.)

a) H2SO4

b)CHF3

c) HOCH2CH2OH

d) BrF3

 

Consider the sketches of four barometers (above).  Barometer i) shows the measurement of atmospheric pressure.  Barometer ii) depicts what happens to the level of mercury after a sample of water has been injected into the tube.  Barometer iii) and iv) depict samples of diethyl ether having been injected into the tubes.  All four barometers are at the same temperature.

3. Barometer iii in the figure above shows a sample of liquid diethyl ether in equilibrium with its vapor. What is the equilibrium vapor pressure for diethyl ether?

mmHg

4. If you injected a small amount of liquid diethyl ether into Barometer iii, would you expect the equilibrium vapor pressure for diethyl ether to increase, decrease or remain constant?

(increase, decrease or remain constant)

Explain

5. In Barometer iv a sample of diethyl ether has already been injected.

a) Is the pressure exerted by the diethyl ether in the vapor phase equal to, greater than or less than the equilibrium vapor pressure for diethyl ether?

(equal to, greater than or less than)

b) Describe what you think could happen when a small amount of liquid diethyl ether is injected into the tube in barometer iv. (Think about how the pressure due to the diethyl ether vapor will change and if condensation might occur or might not occur and why would condensation occur or not occur.)

 

6. Is there anything about the questions that you feel you do not understand? List your concerns/questions.

7. If there is one question you would like to have answered in lecture, what would that question be?