Question

Question 1

If a given solution has a 30 percent solute concentration, and more solute is added to the solution, the new solute concentration could be:

		50%
		25%
		10%
		5%

3 points

Question 2

Which change will create a more concentrated solution?

		increase the volume of the solution
		increase the amount of dissolved solute
		evaporate some of the solvent
		both b and c

3 points

Question 3

To make a 2.0-mole solution, how many moles of solute must be dissolved in 0.50 liters of solution?

		0.25 moles solute
		0.50 moles solute
		1.0 mole solute
		2.0 moles solute

3 points

Question 4

A common stain remover is sold in concentrated form as 1.8M sodium hypochlorite (NaOCl). For everyday use, you create 2.2 liter of a more dilute solution by dissolving 0.015 liters of the 1.8M solution in water. What is the concentration of this new solution?

		0.012M
		0.18M
		1.4M
		2.64M

3 points

Question 5

Colligative properties depend on the:

		identity of the solute particles
		size of the solute particles
		concentration of solute particles
		mass of the solute particles

3 points

Question 6

How does adding a non-volatile solute to a pure solvent affect the boiling point of the pure solvent?

		The solvent will have a lower boiling point.
		The solvent will have a higher boiling point.
		The solvent's boiling point will not be affected.
		The solvent's boiling point will most likely change, but not in a predictable way.

3 points

Question 7

To melt the ice on your driveway, you can use two moles of rock salt (NaCl) or two moles of calcium chloride (CaCl₂). Which solute will have the greatest effect and why?

		NaCl because it is completely soluble in water.
		NaCl because it produces fewer moles of solute particles per mole of compound.
		CaCl2 because it produces more moles of solute particles per mole of compound.
		CaCl2 because it is less volatile than NaCl.

3 points

Question 8

What would be the boiling point of a 3.60 mole aqueous sucrose solution? The boiling point elevation constant for water is 0.512 degrees Celsius per mole.

		98.16°C
		101.8°C
		107.0°C
		108.1°C

3 points

Question 9

What is the molality of an aqueous sucrose solution that boils at 102.0 degrees Celsius? The boiling point elevation constant for water is 0.512 degrees Celsius per mole.

		1.02 m
		2.00 m
		2.51 m
		3.91 m

3 points

Question 10

A 300 gram sample of pure water exerts a vapor pressure of 750 millimeters of mercury on the walls of its container. If 0.27 moles of glucose (C₆H₁₂O₆) is added to the water, what will be the vapor pressure of the resulting solution?

		0.984 mm Hg
		12.1 mm Hg
		738 mm Hg
		748 mm Hg

Answer 1

If a given solution has a 30 percent solute concentration, and more solute is added to the solution, the new solute concentration could be more than 30%

So among the given options the concentration more than 30% is 50%

Question 2

Which change will create a more concentrated solution?

On increasing the amount of dissolved solute will increases the concentration of solution.

When evaporating some of the solvent the volume of solution decreases so concentration of solute increases there by concentration of solution increases.

So both options are correct.

Question 3.

To make a 2.0-mole solution, how many moles of solute must be dissolved in 0.50 liters of solution?

2 moles dissolved in 1.0 L gives 2 molar solution.

0.50 L contains 1.0 moles

Question 4

A common stain remover is sold in concentrated form as 1.8M sodium hypochlorite (NaOCl). For everyday use, you create 2.2 liter of a more dilute solution by dissolving 0.015 liters of the 1.8M solution in water. What is the concentration of this new solution?

According to law of dilution MV = M'V'
Where M = Molarity of stock = 1.8 M
V = Volume of the stock = 0.015 L

M' = Molarity of dilute solution = ?
V' = Volume of the dilute solution = 2.2 L
Plug the values we get , M' = MV /V' = 0.012M