chemistry help?

Question

How would you rank the following compounds in order of increasing viscosity at a given temperature?

a) CH3CH2CH2OH
(b) HOCH2CH(OH)CH2OH
(c) HOCH2CH2OH

Answer 1

I would guess that the most viscous would have the more OH groups ie in order of increasing viscosity a), then c), then b)

Answer 2

The most important characterist affecting the viscosity of liquids is the strength of the intermolecular forces of attraction between the molecules of the liquid. So, compound a) has one HO- group, so the molecules can form hydrogen bonds with other molecules, but only through that one hydroxyl group. Compound c) has 2 hydroxyls, and so can form more hydrogen bonds than a) and so would have a higher viscosity. Compound b) has 3 hydroxyl groups which provides even more opportunities for forming hydrogen bonds with other molecules of the same compound, and so it would have the highest viscosity. For exactly the same reasons, the boiling points of these three compounds will increase in the same order.

Answer 3

In general; in alcoholic compounds,the more OH increase ,the more viscosity increase.

1-(b)
2-(c)
3-(a)

Answer 4

Look at the OH groups. Order of increasing viscosity would go from the least amount of OH groups to the most amount of OH groups.... so:

a
c
b

Good luck with chemistry!

Answer 5

In any given temperature, the strength of viscosity relatively depends on the strength of the intermolecular force. If you find two molecules that conforms to a similar intermolecular force, you compare the molecular mass. For this one, I would select "b>c>a."

Answer 6

It goes like this A, C, B