Chemistry Short Answer Homework

Answer each question in no more than 100 words. Picture attached for first few questions.

 

1. Which molecule(s) can form hydrogen bonds with other molecules of the same compound?

 

2. Which of the following five molecules has the highest boiling point?: Pentane, Diethyl ether, 1-Butanol, 1-Propanol, 2-Butanol. Explain your reasoning.

 

3. Describe a method you might use to separate pentane and 1-butanol, explaining how the properties of the molecules allow you to do so.

 

4. Consider a cylindrical container partially filled with liquid ethanol (C2H6O). How do the rates of ethanol evaporation and condensation change when suddenly a piston enclosing the cylindrical container is moved down, decreasing the volume of the container? How does this system return to equilibrium?

 

5. Arrange the following compounds in order of increasing volatility. 1-methane, CH4, 2-ethane, C2H6, 3-chloroethane, C2H5Cl, and 4-ethanol, C2H6O. Explain your reasoning.

 

6. For each pair of compounds listed below, select the one with a higher boiling point. Justify your selection.

H2S or H2Se

CH3OH or CH3SH

CH3OCH3 or CH3CH2OH

CS2 or CO2

CO2 or NO2

 

7. All molecules attract one another. Yet two liquids, hexane and water are immiscible. Explain why in terms of all pertinent intermolecular interactions.

 

8. We know that at 25 oC water has a pH = 7.0 and Kw=1 x 10-14. Interestingly, at 100 oC water has a Kw= 51.3 x 10-14. What is the pH of water at 100 oC and is it neutral, acidic, or basic?

 

9. Consider the relative acidities of the following pairs: H2SO4 vs. H2SO3; HF vs. HI; CH2ClCOOH vs. CH3COOH; H2O vs. H2O2. For each pair, choose the compound of the higher acidity and explain your choice.

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