Question

Which one of the following most clearly represents the cause of the hydrophobic effect?

	a.	Polar water molecules prefer to hydrogen bond with other water molecules.
	b.	Water and hydrophobic molecules do not interact with each other.
	c.	Non-polar molecules cluster together to release water molecules into bulk solvent and increase entropy.
	d.	Non-polar substances like oil interact with each other more strongly than with water.
	e.	Clustering of non-polar molecules together in an aqueous environment is favored by enthalpy.

Dialysis can be defined by which of the following statement(s)?

	a.	Movement of solvent molecules across a semipermeable membrane from regions of high concentration to regions of lower concentration.
	b.	Movement of solvent molecules from regions of high concentration to regions of lower concentration.
	c.	Both (a) and (b) are examples of dialysis.
	d.	Movement of soluble molecules from regions of high concentration to regions of lower concentration.
	e.	Movement of soluble molecules across a semipermeable membrane from regions of high concentration to regions of lower concentration.

Answer 1

Answer:

1) (d)

Explanation:

Non polar substances forms more strong bonds with each other than with water. This is because polar dissolves polar molecule by forming ionic bonds.Non polar molecule do not have charge to attract water molecule.

2)(d)

Explanation:

Dialysis can be defined as movement of soluble molecules from region of high concentration to region of low concentration through selectively permeable membrane.

For example, Urea ,a nitrogenous waste, is excreted from blood into fluid outside the membrane.Also other electrolytic balance is maintained by transport of various ions across this selectively permeable membrane of the dialysis machine.