I have a test tomorrow and I didn't have enough time to ask my tutor all of the questions for the test. Please tell me how to answer some or all of these question.

 

1) What forces will be overcome to melt 5 grams of solid C2H6? Explain?

 

2) A stream of methanol (CH2O) flows past a positively charged object.

a) Will the stream attract to the object or will it flow past the object without visible effect?

b) Explain your response in a) (Hint - include molecular structure to support explanation)

 

PLEASE explain and answer some or all of these questions as soon as possible!!!!!

As to the first one, look at what intermolecular forces are usually listed for C2H6. It is not polar, because it is symmetrical (and C-H bonds aren't that polar anyways). It does not have a hydrogen bonded to a nitrogen, oxygen, or fluorine. It is not an ionic compound, as it is not composed of 2 ions. That leaves 1 force left. You should be able to take it from there.

 

2) First of all, you gave the formula for formaldehyde, not methanol, so that may be one of your problems. Methanol is CH3-OH. The stream will be attracted if it has charges in it. Look at the structure of methanol, and see if you can identify where (or if) charges will end up on the molecule.