2. A student calculated the percent by mass of water in a sample of BaCl₂2 H₂O to be 16.4%, but the accepted value is 14.8%. What was the student's percent error?
a)       c)
b)       d)

3. A student observed the following reaction:

AlCl₃ + 3 NaOH Al(OH)₃ + 3 NaCl

After the products were filtered, which substance remained on the filter paper?
a) NaCl
b) NaOH
c) AlCl₃
d) Al(OH)₃

4. The table below shows the data collected by a student as heat was applied at a constant rate to a solid below its freezing point.

Time (min)	Temperature (C)	Time (min)	Temperature (C)
0	20	18	44
2	24	20	47
4	28	22	51
6	32	24	54
8	32	26	54
10	32	28	54
12	35	30	54
14	38	32	58
16	41	34	62

What is the boiling point of this substance?
a) 32C
b) 54C
c) 62C
d) 100C

5. Which quantity expresses the sum of the given masses to the correct number of significant figures?

a) 5800 g
b) 5798 g
c) 5797.9 g
d) 6797.892 g

6. A student records the following observations about an unknown solution:

• conducts electricity
• turns blue litmus red

The student should conclude that the unknown solution is most likely
a) an acid
b) a base
c) an ester
d) an alcohol

7. Water containing phenolphthalein will change from colorless to pink with the addition of
a) HOH
b) HCl
c) KOH
d) KCl

8. Which process can be used to separate water from BaCl₂2 H₂O?
a) dehydration
b) condensation
c) sublimation
d) filtration

9. What is the quotient of 8.01 grams divided by 3.127 grams, expressed to the correct number of significant figures?
a) 2.6
b) 2.56
c) 2.562
d) 2.5616

10. The following data wee collected by a student performing an acid-base titration:

• Volume of the acid, HCl = 20.0 mL
• Molarity of the acid = 0.50 M
• Volume of the base, NaOH = 40.0 mL

From the collected data, the concentration of the base should be calculated as
a) 1.0 M
b) 2.0 M
c) 0.25 M
d) 0.50 M

Score =
Correct answers:

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