Solutions Quiz
Unique
Designation:__________
1) A true Solution has all the following properties except
(A) it is clear
(B) it will not separate on standing
(C) a beam of light passing through it will be visible
(D) it will pass through a filter
_____
2) Which has the least effect on the rate of solution of a solid in a liquid?
(A) surface area (B) agitation (C) pressure (D) temperature
_____
3) As additional solid KCl is added to a saturated solution of KCl, the conductivity of the solution
(A) decreases (B) increases (C) remains the same
_____
4) A solution containing 100g KNO3 per 100g H2O at 50oC is considered to be
(A) Dilute and unsaturated
(B) Dilute and supersaturated
(C) Concentrated and unsaturated
(D) Concentrated and unsaturated
_____
5) Which substance increases in solubility as the temperature decreases? (A) KCLO3 (B) NH3 (C) KNO3 (D) NaCl
_____
6) As the temperature of a liquid decreases, the amount of a gas that can be dissolved
(A) decreases (B) increases (C) is constant (D) depends on the gas _____
7) A student tested the solubility of a salt at different temperatures and then used the reference tables to identify the salt. The data appears below.
|
Temperature (oC) |
Solubility data (g of salt per 10g of
water) |
|
30 |
1.2 |
|
50 |
2.2 |
|
62 |
3.0 |
|
76 |
4.0 |
What is the identity of the salt?
(A) KNO3 (B) NaCl (C) KCl (D) NH4Cl
_____
8) An Aqueous solution of copper sulfate is poured into a filter paper cone. What passes through the filter paper?
(A) only solvent (B) only solute (C) both solvent and solute
(D) neither
_____
9) Most Ionic substances are soluble in water because water molecules are (A) nonpolar (B) inorganic (C) ionic (D) polar
_____
10) Which sample is a mixture?
(A) H2O(s) (B) H2O(l) (C) NaCl(l) (D) NaCl(aq)
_____
11)A decrease in pressure has the greatest effect on a solution that contains
(A) a gas in a liquid (B) a solid in a solid
(C)a liquid in a liquid (D) a solid in a liquid
_____
12)Which compound’s solubility decreases most rapidly as the temperature changes from 10-700C?
(A) NH4Cl (B) NH3 (C) HCl (D) KCl _____
13)A student drops a crystal of NaCl into a beaker of NaCl(aq) and the crystal dissolves. The original solution must have been
(A) Supersaturated (B) saturated
(B) unsaturated (D) heterogeneous
_____
14) Compare to pure water at standard pressure, an aqueous solution will have a
(A) higher boiling point and a higher freezing point
(B) higher boiling point and a lower freezing point
(C) lower boiling point and a higher freezing point
(D) lower boiling point and a lower freezing point
_____
15) A solution contains 100g of a compound dissolved in 100g of water at 50oC. The solution could be a
(A) Supersaturated solution of NaNO3
(B) Saturated solution of NaNO3
(C) Supersaturated solution of KNO3
(D) Saturated solution of KNO3
_____
16) As sucrose is dissolved in water at constant temperature , the vapor pressure of the solution
(A) increases (B) decreases (C) remains the same
_____
For questions 17-19 refer to the solubility curve below for substance X
17)Which point represents a supersaturated solution of X?
(A) A (B) B (C) C (D) D
_____
18) Which point represents the most concentrated solution of X? (A) A (B) B (C) C (D) D
_____
19) Which point represents a saturated solution of X?
(A) A (B) B (C) C (D) D
_____
Application
20) Complete the dissociation reaction
CaF2(s)ŕ _____+ _____
21) What is the Ksp expression for the above equation?
________
22) The Ksp for CaF2 at 25oC is very low. Are the products or the reactants favored in the dissociation reaction?
23) Write the Ksp equation for Ag3PO4(s) ŕ 3Ag+(aq) + PO4-(aq)
24) The table below gives the solubility of Ca(OH)2(S) in 100g of H2O at various temperatures. What is unusual about the behavior of the solubility of this salt?
|
Temperature
(oC) |
Solubility
(g Ca(OH)2/100g H2O) |
|
0 |
.189 |
|
20 |
.173 |
|
40 |
.141 |
|
60 |
.121 |
|
80 |
.094 |