Question :
31.Particles of the dispersed phase in a colloidal dispersion are
a.small : 1309613
31.Particles of the dispersed phase in a colloidal dispersion are
a.small enough that they cannot be seen by the naked eye
b.large enough that they settle out under the influence of gravity
c.small enough that they cannot be filtered out using filter paper
d.more than one correct response
e.no correct response
32.In which of the following pairs of properties are both members of the pair colligative properties?
a.density, boiling point
b.vapor pressure, osmotic pressure
c.solubility, freezing point
d.more than one correct response
e.no correct response
33.Which of the following solute amounts, when dissolved in 1.00 kg of water. Would produce a solution with a freezing point of –1.86oC?
a.0.500 mole NaCl
b.1.00 mole glucose
c.2.00 mole KBr
d.more than one correct response
e.no correct response
34.Which of the following solutions has an osmolarity of 3.0?
a.4.0 M glucose
b.2.0 M NaCl
c.1.0 M Na3PO4
d.more than one correct response
e.no correct response
35.In which of the following pairings are the terms closely related?
a.hemolysis, hypotonic solution
b.hypertonic, higher osmotic pressure than within cells
c.isotonic solution, crenation
d.more than one correct response
e.no correct response
36.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices.
(1) A saturated solution always contains excess undissolved solute.
(2) In aqueous solution, Ba2+ ion combines with NO3- ion to produce an insoluble salt.
(3) Addition of a nonvolatile solute to a solvent produces a solution with lower vapor pressure, freezing point, and boiling point than that of pure solvent.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
37.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices.
(1) Equal volumes of two solutions of the same molarity contain the same number of grams of solute.
(2) Hemolysis and crenation are “opposite” processes.
(3) The solubility rule “like dissolves like” is not adequate for predicting the solubility of ionic compounds in water.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
38.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices.
(1) A colloidal dispersion is a homogeneous mixture and a suspension is a heterogeneous mixture.
(2) The selectivity of a semipermeable membrane is based on polarity differences among molecules.
(3) For dilute aqueous solutions, %(m/m) and %(m/v) concentration units have almost the same magnitude because the density of water is 1.00 g/mL and the solution is almost entirely water.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
39.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices.
(1) The Tyndall effect involves light-scattering by colloidal-sized particles.
(2) Aqueous solutions of 0.1 M KCl and 0.1 M glucose would have the same freezing point because the solvent is water in both cases.
(3) Percent by volume is a concentration unit used when both solute and solvent are liquids.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
40.Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices.
(1) To find the molarity of a solution, both solution volume and the number of moles of solute must be known.
(2) Osmosis involves the passage of solvent from a dilute solution (or pure solvent) into a more concentrated solution.
(3) 5.0 %(m/v) glucose solution and 0.9 %(m/v) sodium chloride solution have the same osmolarity and are hypotonic relative to red blood cells.
a.All three statements are true.
b.Two of the three statements are true.
c.Only one of the statements is true.
d.None of the statements is true.
