Chemistry 51 - Fundamentals of Chemistry » Fall 2021 » Chapter 9 Homework
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Question #1
What is the molarity of an aqueous solution of 25.0 g of NaOH (molecular mass of sodium hydroxide is 40 u) in 250 mL?
A.
1.0 mol/L
B.
0.625 mol/L
C.
2.5 mol/L
D.
0.25 mol/L
E.
1.25 mol/L
Question #2
200 mL of water is added to 700 mL of a 3.0-M NaCl solution. What is the concentration of the diluted solution?
A.
21 M
B.
2.3 M
C.
0.86 M
D.
14.6 M
E.
10.5 M
Question #3
Which of the following is a strong electrolyte?
A.
vinegar
B.
carbon tetrachloride
C.
sugar
D.
sodium chloride
E.
honey
Question #4
A saline solution with a mass of 400 g has 30 g of NaCl dissolved in it. What is the mass/mass percent concentration of the solution?
A.
133%
B.
75%
C.
7.50%
D.
13.33%
E.
0.07%
Question #5
Austenitic steel is composed of 74% iron, 18% chromium and 8% nickel. Which of the following can be called the solute(s)?
A.
iron and nickel
B.
chromium and iron
C.
chromium and nickel
D.
chromium alone
E.
iron alone
Question #6
When a solute is dissolved by water, the process is called ____________.
A.
aquation
B.
hydration
C.
saturation
D.
solvation
E.
dissociation
Question #7
How many grams of sucrose (molecular mass 342.3 u) are present in 4 L of 3.5 M solution?
A.
4792g
B.
1198g
C.
1369 g
D.
229 g
E.
391 g
Question #8
A 60-kg body contains 0.0085 g of Ni. What is the concentration of Ni in parts per million?
A.
85 ppm
B.
0.55 ppm
C.
0.14 ppm
D.
8.5 ppm
E.
18 ppm
Question #9
A solution containing 32% volume/volume of methanol in water has a volume of 145 mL. The volume of ethanol in the solution is 46.4 mL.
A.
FALSE
B.
TRUE
Question #10
All solutions are mixtures.
A.
TRUE
B.
FALSE
Question #11
Oil and water are _____.
A.
miscible
B.
mixable
C.
insoluble
D.
soluble
E.
immiscible
Question #12
Carbon tetrachloride will form a solution with NaCl.
A.
FALSE
B.
TRUE
Question #13
A solution has the 23.22% mass/volume of a particular solvent what is the mass of solute dissolved in 2.5 liter of solvent?
A.
5812.5 g
B.
0.232 g
C.
0.5805 g
D.
232.2 g
E.
580.5 g
Question #14
The colligative properties depend on the number of particles. Which of the following solutes will have the greatest effect on the colligative properties of a solution?
A.
KBr
B.
Na2SO4
C.
NaCl
D.
CCl4
E.
glucose
Question #15
In a solution of ethanol and water, ethanol makes up 95% of the volume. It is the solute.
A.
FALSE
B.
TRUE
Question #16
Which of the following exists in the pure form, and not as a solution?
A.
helium gas
B.
mineral water
C.
steel
D.
soda
E.
brass
Question #17
Which of the following would be most likely to form a solution?
A.
alcohol and CCl4
B.
wax and oil
C.
water and CCl4
D.
oil and water
E.
wax and water
Question #18
Pure water will have a lower boiling point than salt water.
A.
TRUE
B.
FALSE
Question #19
500.0 mL of 0.8000 M potassium chlorate (molar mass: 122.55 g/mol) is diluted to 850.0 mL. How many grams of potassium chlorate are present in the diluted solution?
A.
0.4700 g
B.
470.0 g
C.
122.6 g
D.
57.67 g
E.
49.02 g
Question #20
How many mL of 2.3 M HCl is required to neutralize 85 g of KOH given the balanced reaction: HCl + KOH KCl + H2O? (molar masses: KOH = 56.1 g/mol; HCl = 36.45 g/mol)
A.
656 mL
B.
1500 mL
C.
370 mL
D.
1530 mL
E.
195 mL
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