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In: Chemistry

Properties of Liquids 1.Which compound would you expect to have the greater surface tension: acetone (CH3)2CO...

Properties of Liquids

1.Which compound would you expect to have the greater surface tension: acetone (CH3)2CO or water? Why?

2.Water “wets” some surfaces and beads up on others. Mercury in contrast beads up on almost all surfaces, explain.

3.Select the compound with the greatest viscosity, explain: H2S, HF, H2O2.

Water “wets” some surfaces and beads up on others. Mercury in contrast beads up on almost all surfaces, explain.

Select the compound with the greatest viscosity, explain: H2S, HF, H2O2.

Solutions

Expert Solution

1.Which compound would you expect to have the greater surface tension: acetone (CH3)2CO or water? Why?.

Answer:

Water because it has van der Waals, dipole-dipole, and hydrogen-bond intermolecular forces, whereas acetone only has van der Waals and dipole-dipole forces.

2.Water “wets” some surfaces and beads up on others. Mercury in contrast beads up on almost all surfaces, explain.

Answer:

No hydrogen bonding. Water "wets" a surface because it is attracted to the surface and spreads out. Mercury has no attraction to other substances, only to itself, and therefore beads up. A bead is the most efficient way for the Hg to be attracted to itself.

You could also say that water beads up, as on a freshly polished surface. In that case the water is more attracted to other water molecules than to the polished surface. When water wets a surface there are many molecules that attract water molecules, unlike the polish.

There two kind of force of atractions between molecules .
cohesive force between same kind molecule
adhesive force between difrient kind molecules
in mercury there are strong cohesive forces thas way it not going to wet.
but in water or other liquids adhesive forces are stroger tha cohesive thats way it is wet

3.Select the compound with the greatest viscosity, explain: H2S, HF, H2O2.

Answer:

HF: viscosity = 0.0001139 Poise

H2S: viscosity = 0.0001179 Poise

H2O2: viscosity =~ 1.8 cP = 0.018 Poise

The degree of hydrogen bonding of each of these materials will affect how these materials can behave under shear stresses, which is what viscosity is measuring. H2O2 forms a network of hydrogen bonded molecules in the liquid state. It is this hydrogen bonded "glue" which makes the liquid more viscous.

idth: 0px; background-color: rgb(255, 255, 255);">Select the compound with the greatest viscosity, explain: H2S, HF, H2O2.

queen_honey_blossom answered 2 years ago
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