Solutions Unit Exam
Date
Name
1. Which mixture can be separated by using the equipment
shown below?
Period
6. Which ion, when combined with chloride ions, Cl –,
forms an insoluble substance in water?
(1) Fe 2+
(2) Mg 2+ (3) Pb 2+
(4) Zn2+
7. According to Reference Table F, which of these
compounds is most soluble at 298 K and 1 atm?
(1) AgNO3
(2) AgCl
(3) PbCrO 4
(4) PbCO3
8. According to Reference Table F, which substance is most
soluble?
(1) AgI
(2) CaSO 4
(3) PbCl2
(4) (NH4) 2CO 3
9. Based on Reference Table F, which salt is least soluble?
(1) FeCO3
(2) Na 2CO 3
(1)
(2)
(3)
(4)
10. The attraction between water molecules and an Na +
ion or a Cl– ion occurs because water molecules are
NaCl(aq) and SiO 2(s)
NaCl(aq) and C 6H 12 O6(aq)
CO 2(aq) and NaCl(aq)
CO 2(aq) and
C6H 12 O6(aq)
(1) linear
(2) symmetrical
(1) KClO 3
(2) KNO 3
AlCl 3(aq) + 3 NaOH(aq) ® Al(OH)3(s) + 3 NaCl(aq)
(1)
(2)
(3)
(4)
(3) AlCl 3
(4) Al(OH) 3
3. In an aqueous solution of sodium fluoride, the solvent is
(2) Na
(3) NaF
(4) H 2O
4. Which compound is insoluble in water?
(1) calcium bromide
(3) silver bromide
(2) potassium bromide (4) sodium bromide
5. Which barium salt is insoluble in water?
(1) BaCO 3
(2) BaCl2
Ms. Roman
(3) NaCl
(4) NH 4Cl
12. According to Table F which compound is soluble in
water?
After the products were filtered, which substance
remained on the filter paper?
(1) F
(3) polar
(4) nonpolar
11. Which compound is least soluble in water at 60. °C?
2. A student observed the following reaction:
(1) NaCl
(2) NaOH
(3) BaCl2
(4) CaCl 2
barium phosphate
calcium sulfate
silver iodide
sodium perchlorate
13. According to your Reference Tables, which substance
forms an unsaturated solution when 80 grams of the
substance is dissolved in 100 grams of H 2O at 10°C?
(1) KI
(2) KNO 3
(3) NaNO3
(4) NaCl
14. The solubility of KClO 3(s) in water increases as the
(1)
(2)
(3)
(4)
(3) Ba(ClO 4)2
(4) Ba(NO 3)2
Page 1
temperature of the solution increases
temperature of the solution decreases
pressure on the solution increases
pressure on the solution decreases
Regents Chemistry
Solutions Unit Exam
15. According to your Reference Tables, which of these
compounds is the least soluble in water?
(1) K 2CO 3
(2) KC2H 3O2
21. A student obtained the following data in determining
the solubility of a substance.
(3) Ca 3(PO 4) 2
(4) Ca(NO 3)2
16. Solubility data for four different salts in water at 60°C
are shown in the table below.
Which graph best represents the solubility curve drawn
from the results obtained by the student?
(1)
Which salt is most soluble at 60°C?
(1) A
(2) B
(3) C
(4) D
(2)
17. According to Reference Table G, which of these
substances is most soluble at 60ºC?
(1) NaCl
(2) KCl
(3) KClO 3
(4) NH4Cl
18. According to Reference Table G, how many grams of
KNO 3 would be needed to saturate 200 grams of water
at 70ºC?
(1) 43 g
(2) 86 g
(3)
(3) 134 g (4) 268 g
19. Based on Reference Table G, what is the maximum
number of grams of KCl(s) that will dissolve in 200
grams of water at 50°C to produce a saturated
solution?
(1) 38 g
(2) 42 g
(3) 58 g
(4)
(4) 84 g
20. Based on Reference Table G, what change will cause
the solubility of KNO3(s) to increase?
(1)
(2)
(3)
(4)
decreasing the pressure
increasing the pressure
decreasing the temperature
increasing the temperature
Ms. Roman
22. Which compound decreases in solubility as the
temperature of the solution is increased from 10ºC to
50ºC?
(1) NH 4Cl
(2) NaCl
Page 2
(3) NH3
(4) NaNO3
Regents Chemistry
Solutions Unit Exam
23. As the temperature increases from 0ºC to 25ºC the
amount of NH3 that can be dissolved in 100 grams of
water
(1)
(2)
(3)
(4)
27. Given the diagram below that shows carbon dioxide in
an equilibrium system at a temperature of 298 K and a
pressure of 1 atm:
decreases by 10 grams
decreases by 40 grams
increases by 10 grams
increases by 40 grams
24. The graph below represents four solubility curves.
Which curve best represents the solubility of a gas in
water?
Which changes must increase the solubility of the
carbon dioxide?
(1)
(2)
(3)
(4)
increase pressure and decrease temperature
increase pressure and increase temperature
decrease pressure and decrease temperature
decrease pressure and increase temperature
28. What is the total number of grams of NaI(s) needed to
make 1.0 liter of a 0.010 M solution?
(1) 0.015 (2) 0.15
(3) 1.5
(4) 15
29. Which solution is the most concentrated?
(1) A
(2) B
(3) C
(1)
(2)
(3)
(4)
(4) D
1 mole of solute dissolved in 1 liter of solution
2 moles of solute dissolved in 3 liters of solution
6 moles of solute dissolved in 4 liters of solution
4 moles of solute dissolved in 8 liters of solution
25. Under which conditions of temperature and pressure is
a gas most soluble in water?
30. What is the molarity of a solution containing 20 grams
of NaOH in 250 milliliters of solution?
(1) high temperature and low pressure
(1) 1 M
(3) 0.04 M
(2) high temperature and high pressure
(2) 2 M
(4) 0.5 M
(3) low temperature and low pressure
(4) low temperature and high pressure
31. How many grams of KOH are needed to prepare 250
milliliters of a 2.0 M solution of KOH?
26. At room temperature, the solubility of which solute in
water would be most affected by a change in pressure?
(1) 1.00 g
(3) 28 g
(1) methanol
(2) sugar
Ms. Roman
(3) carbon dioxide
(4) sodium nitrate
(2) 2.00 g
(4) 112 g
32. The molarity of an aqueous solution of NaCl is defined
as the
(1)
(2)
(3)
(4)
Page 3
grams of NaCl per liter of water
grams of NaCl per liter of solution
moles of NaCl per liter of water
moles of NaCl per liter of solution
Regents Chemistry
Solutions Unit Exam
33. What is the molarity of 1.5 liters of an aqueous
solution that contains 52 grams of lithium fluoride, LiF,
(gram-formula mass = 26 grams/mole)?
(1) 1.3 M
(2) 2.0 M
(1) 2.5 × 10–4 ppm
(2) 2.5 ppm
(3) 3.0 M
(4) 0.75 M
34. How many total moles of KNO 3 must be dissolved in
water to make 1.5 liters of a 2.0 M solution?
(1) 0.50 mol
(2) 2.0 mol
(3) 3.0 mol
(4) 1.3 mol
35. What is the molarity of a solution containing 20 grams
of NaOH in 500 milliliters of solution?
(1) 1 M
(2) 2 M
(3) 0.04 M
(4) 0.5 M
36. What is the molarity of a solution of NaOH if 2 liters of
the solution contains 4 moles of NaOH?
(1) 0.5 M (2) 2 M
41. If 0.025 gram of Pb(NO 3)2 is dissolved in 100. grams of
H 2O, what is the concentration of the resulting
solution, in parts per million?
(3) 8 M
(4) 80 M
42. What is the concentration of a solution, in parts per
million, if 0.02 gram of Na 3PO4 is dissolved in 1000
grams of water?
(1) 20 ppm
(2) 2 ppm
(1) 1.0 × 10 -4 g
(2) 1.0 × 10-3 g
(3) 1.0 × 10-2 g
(4) 1.0 × 10-1 g
44. How many grams of KNO3 should be dissolved in water
to make 500.0 grams of a 20.0 ppm solution?
(1) 1.00 × 10-1 g
(2) 1.00 × 10 -2 g
(3) 1.00 × 10-3 g
(4) 1.00 × 10-4 g
45. What is the concentration expressed in parts per
million of a solution containing 15.0 grams of KNO3 in
65.0 grams of H 2O?
(1) 90.0 g of C6H 12 O6 dissolved in 500.0 mL of
solution
(2) 90.0 g of C6H 12 O6 dissolved in 1000. mL of
solution
(3) 180.0 g of C 6H 12 O 6 dissolved in 500.0 mL of
solution
(4) 180.0 g of C6H 12 O6 dissolved in 1000. mL of
solution
(1) 1.88 × 10 5 ppm
(2) 2.00 × 105 ppm
(3) 2.31 × 105 ppm
(4) 5.33 × 106 ppm
46. Compared to the freezing point and boiling point of
water at 1 atmosphere, a solution of a salt and water
at 1 atmosphere has a
38. What is the molarity of a solution that contains
40. grams of NaOH in 0.50 liter of solution?
(1)
(2)
(3)
(4)
(3) 0.50 M
(4) 0.25 M
39. What is the concentration of a solution which contains
1 mole of CaCl 2 dissolved in 2,000 milliliters of
solution?
(1) 1 M
(2) 2 M
(3) 0.2 ppm
(4) 0.02 ppm
43. How many grams of NaCl are needed to be dissolved in
water to make 1.0 gram of a 100.0 ppm solution?
37. Which preparation produces a 2.0 M solution of C6H 12
O6? [molecular mass = 180.0]
(1) 1.0 M
(2) 2.0 M
(3) 250 ppm
(4) 4.0 × 103 ppm
lower freezing point and a lower boiling point
lower freezing point and a higher boiling point
higher freezing point and a lower boiling point
higher freezing point and a higher boiling point
47. Which concentration of a solution of CH3OH in water
has the lowest freezing point?
(3) 0.5 M
(4) 0.25 M
(1) 0.1 M
(2) 0.01 M
(3) 0.001 M
(4) 0.0001 M
40. What is the total mass of solute in 1000. grams of a
solution having a concentration of 5 parts per million?
(1) 0.005 g
(2) 0.05g
Ms. Roman
(3) 0.5 g
(4) 5g
Page 4
Regents Chemistry
Solutions Unit Exam
48. What occurs as a salt dissolves in pure water?
49. Which solution has the lowest freezing point?
(1) The number of ions in the solution decreases, and
the freezing point decreases.
(2) The number of ions in the solution decreases, and
the freezing point increases.
(3) The number of ions in the solution increases,
and the freezing point decreases.
(4) The number of ions in the solution increases, and
the freezing point increases.
Ms. Roman
(1)
(2)
(3)
(4)
10. g of KI dissolved in 100. g of water
20. g of KI dissolved in 200. g of water
30. g of KI dissolved in 100. g of water
40. g of KI dissolved in 200. g of water
50. A 1 kilogram sample of water will have the highest
freezing point when it contains
Page 5
(1)
(2)
(3)
(4)
1 × 10 17 dissolved particles
1 × 10 19 dissolved particles
1 × 10 21 dissolved particles
1 × 10 23 dissolved particles
Regents Chemistry
Answer Key
Solutions Unit Exam
1.
1
36.
2
2.
4
37.
3
3.
4
38.
2
4.
3
39.
3
5.
1
40.
1
6.
3
41.
3
7.
1
42.
1
8.
4
43.
1
9.
1
44.
2
10.
3
45.
1
11.
1
46.
2
12.
4
47.
1
13.
1
48.
3
14.
1
49.
3
15.
3
50.
1
16.
4
17.
4
18.
4
19.
4
20.
4
21.
1
22.
3
23.
2
24.
2
25.
4
26.
3
27.
1
28.
3
29.
3
30.
2
31.
3
32.
4
33.
1
34.
3
35.
1
Ms. Roman
Page 6
Regents Chemistry