IMF Free Response Question

5

Group Members Names:

Answer the following questions in terms of principles of chemical bonding and intermolecular forces. In each explanation where a comparison is to be made, a complete answer must include a discussion of both substances. The following complete Lewis electron-dot diagrams may be useful in answering parts of this question.

20

At 1 atm and 298 K, pentane is a liquid whereas propane is a gas. Explain.

20

At 1 atm and 298 K, methanol is a liquid whereas propane is a gas. Explain.

10

Indicate the hybridization of the carbon atom in methanol

10

Indicate the hybridization of the carbon atom in methanoic (formic) acid

10

Draw the complete Lewis electron-dot diagram for a molecule of propanoic acid, HC3H5O2 .

10

Explain the following observations about the two carbon-oxygen bonds in the methanoate (formate) anion, HCO2−. You may draw a Lewis electron-dot diagram (or diagrams) of the methanoate ion as part of your explanations.

Observation 1: The two carbon-oxygen bonds in the methanoate (formate) anion, HCO2−, have the same length.

10

Explain the following observations about the two carbon-oxygen bonds in the methanoate (formate) anion, HCO2−. You may draw a Lewis electron-dot diagram (or diagrams) of the methanoate ion as part of your explanations.

Observation 2: The length of the carbon-oxygen bonds in the methanoate (formate) anion, HCO2−, is intermediate between the length of the carbon-oxygen bond in methanol and the length of the carbon-oxygen bond in methanal.

5

IMF Free Response Question

Group Members Names:

At 1 atm and 298 K, pentane is a liquid whereas propane is a gas. Explain.

At 1 atm and 298 K, methanol is a liquid whereas propane is a gas. Explain.

Indicate the hybridization of the carbon atom in methanol

Indicate the hybridization of the carbon atom in methanoic (formic) acid

Draw the complete Lewis electron-dot diagram for a molecule of propanoic acid, HC3H5O2 .

What is one question you still have about intermolecular forces?

Group Members Names:

At 1 atm and 298 K, pentane is a liquid whereas propane is a gas. Explain.

At 1 atm and 298 K, methanol is a liquid whereas propane is a gas. Explain.

Indicate the hybridization of the carbon atom in methanol

Indicate the hybridization of the carbon atom in methanoic (formic) acid

Draw the complete Lewis electron-dot diagram for a molecule of propanoic acid, HC3H5O2 .

What is one question you still have about intermolecular forces?