Chapter 7 Flashcards
Which of the following statements relating to a solution is not correct?
a. A solution may contain more than one solute.
b. A solution may contain only one solute.
c. Water is always the solvent in a solution.
d. More than one correct response given.
d. more than one correct response given
Suppose a solution contains 200 grams of water and 15 grams of sugar. Which of the following statements is true?
a. Sugar would be classified as the solvent.
b. Water would be classified as the solvent.
c. Either component could be classified as the solvent.
d. More than one response is correct.
b. water would be classified as the solvent
A 100 mL sample of a saturated CaSO4 solution is evaporated to dryness. The water solvent all evaporates and leaves behind a solid residue of CaSO4 that weighs 0.23 g. The CaSO4 would be classified as
a. insoluble in water
b. slightly soluble in water
c. soluble in water
d. very soluble in water
b. slightly soluble in water
You want to remove as much CO2 gas as possible from a water solution. Which of the following treatments would be most effective?
a. cool the solution
b. filter the solution
c. boil the solution
d. aerate the solution
c. boil the solution
When will carbon dioxide in a carbonated soft drink dissolve best?
a. after shaking the container
b. after heating the container
c. after cooling the container
d. after releasing the pressure
c. after cooling the container
Iodine, I2, is very slightly soluble in water, a polar solvent, but quite soluble in tolune, a nonpolar solvent. What can be inferred about the nature of the I2 molecule?
a. It is ionic.
b. It is polar.
c. It is nonpolar.
d. Nothing can be inferred.
c. it is nonpolar
How many moles of Na2CO3 would be needed to react with 750 mL of 0.250 M H2SO4 solution? Na2CO3 + H2SO4 → Na2SO4 + CO2 + H2O a. 3.00 × 103 b. 0.333 c. 1.33 d. 0.188
d. 0.188
A solution is made by combining 4.00 g of sugar and 100 mL of water (density = 1.00 g/mL). What is the concentration in % w/w?
a. 26.0
b. 4.00
c. 0.0400
d. 3.85
d. 3.85
What volume of a 10.00% (w/v) solution of sugar is needed to provide 2.00 g of sugar?
a. 0.200 liter
b. 1.00 mL
c. 20.0 mL
d. 5.00 mL
c. 20.0 mL
A solution is made by dissolving 15.0 mL of oil in enough gasoline to give 50.0 mL of solution. What is the % (v/v) of oil in the solution?
a. 30.0
b. 23.1
c. 42.9
d. 3.33
a. 30.0
A solution is prepared by adding 25.0 mL of 1.30 M AlCl3 solution to a flask, and then adding enough water to give a final volume of 200.0 mL. What is the molarity of the solution?
a. 0.260
b. 0.163
c. 6.50
d. 1.24
b. 0.163
An isotonic salt solution is 0.90% (w/w) NaCl in water. How many grams of NaCl are contained in 1.00 kg of such a solution?
a. 0.090
b. 0.90
c. 9.0
d. 90
c. 9.0
The boiling point of a solution of sugar water is
a. higher than that of pure solvent
b. the same as that of pure solvent
c. lower than that of pure solvent
d. impossible to determine
a. higher than that of pure solvent
Compared to pure water, a salt water solution will have a
a. lower vapor pressure, freezing point and boiling point
b. higher vapor pressure, freezing point and boiling point
c. lower vapor pressure and freezing point and a higher boiling point
d. higher freezing point and a lower vapor pressure and boiling point
c. lower vapor pressure and freezing point and a higher boiling point
A solution is prepared by dissolving 4.66 g of KCl in enough distilled water to give 250 mL of solution. KCl is a strong electrolyte. How will the freezing point of the solution be different from that of pure water?
Note: Kf for water is 1.86°C/M.
a. solution will be 0.930°C lower than water
b. solution will be 0.475°C lower than pure water
c. solution will be 0.930°C higher than pure water
d. solution will be 0.475°C higher than pure water
a. solution will be 0.930*C lower than water
