1. Which would have a higher surface tension, H2O or C6H14? Why? Would the shape

Question

1. Which would have a higher surface tension, H2O or C6H14? Why? Would the shape of the H2O meniscus in a glass tube be the same or different than C6H14?

2. Does Fe form a molecular solid or an atomic solid? Explain.

3. Why is molality used in the equations describing freezing-point depression and boiling-point elevation? Explain in detail and explain the reason why molarity is nto used.

4. Predict with substance would be more soluble in water, NH3 or PH3. Explain your choice. 1. Which would have a higher surface tension, H2O or C6H14? Why? Would the shape of the H2O meniscus in a glass tube be the same or different than C6H14?

2. Does Fe form a molecular solid or an atomic solid? Explain.

3. Why is molality used in the equations describing freezing-point depression and boiling-point elevation? Explain in detail and explain the reason why molarity is nto used.

4. Predict with substance would be more soluble in water, NH3 or PH3. Explain your choice.

Explanation / Answer

1)Water , having a lagre dipole moment has relatively cohesive forces.Hexane ,C6H14, is essentially nonpolar It has low

cohesive forces . Water would therfore have the higher surface tension

the watert meniscus iss concave because the adhesive forces of water to polar constitutes on the surface of the glass

are stronger than it's cohesive forces .

Hexane would have a convex meniscus.It has very small adhesive forces,a nd the slightly larger cohesive forces would dominate

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