GENERAL CHEMISTRY I: CHEM 1311
EXAM 1
Thursday, February 14, 2013
Name_______________________________________
1.
Use of the senses, or extensions thereof, to acquire information about natural phenomena is a(n)
a) experiment
2.
b) hypothesis
b) theory
c) law
b) experiment
d) observation
c) hypothesis
b) the scientific method
e) hypothesis
d) law
c) an experiment
e) theory
d) a theory
e) a law
A tested explanation of natural phenomena is
b) a hypothesis
c) a theory
d) an observation
e) a law
A scientific law usually
a) has a narrow focus (applies in only a few cases)
8.
e) law
The general process of acquiring, testing, and refining information about natural phenomena is
a) the scientific method
7.
d) observation
A tentative explanation of natural phenomena is a(n)
a) an observation
6.
c) scientific method
b) scientific method
a) observation
5.
e) hypothesis
An observation of natural phenomena carried out in a controlled manner is a(n)
a) experiment
4.
d) observation
A concise statement or mathematical equation about natural phenomena is a(n)
a) hypothesis
3.
c) theory
b) has a broad focus (applies in a wide variety of cases)
What is the relationship between theories and laws?
a) a law says what happens and a theory explains why
b) a theory says what happens and a law explains why
9.
If you immediately conclude you have a bad battery when your car won’t start, your explanation for the cause of
the problem would best be classified as a(n)
a) observation
10.
d) hypothesis
e) experiment
b) law
c) hypothesis
d) experiment
e) observation
In which can you place more confidence, a theory or a hypothesis?
a) theory
12.
c) law
Which of the following terms has been described as “a summary of patterns seen in large collections of data”?
a) theory
11.
b) theory
b) hypothesis
What should you do when your experimental data is not turning out as expected?
a) Assume that you made an error in the experiment, and modify the data so that it is in agreement with
your proposed explanation of natural phenomena.
b) Modify your proposed explanation of natural phenomena, so that it can account for your experimental data.
13.
To be useful, a theory or hypothesis should be one
a) that you can make predictions from, which can then be tested by conducting experiments.
b) from which no predictions can be made, because theories and hypotheses should be accepted as
fundamental principles of scientific truth, without any need for verification.
14.
What happens if numerous experiments are conducted and the experimental data are always in agreement with
the proposed explanation of natural phenomena?
a) a theory eventually becomes a hypothesis
15.
Convert 12.9 meters to centimeters.
a) 0.129 cm
16.
b) a hypothesis eventually becomes a theory
b) 129 cm
c) 1290 cm
d) 12900 cm
e) 129000 cm
c) 6.71 g
d) 6710 g
e) 671000 g
Convert 671 milligrams to grams.
a) 0.0671 g
b) 0.671 g
17.
Convert 0.487 milliliters to deciliters.
a) 0.00487 dL
18.
b) 1.74 cm
c) 174 cm
d) 174000 cm
e) 17400000 cm
b) 2.45 x 10-3 kg
c) 2.45 x 10-1 kg
d) 4.45 x 107 kg
e) 2.45 x 10-8 kg
b) 0.0184 cm2
d) 18400 cm2
e) 184000 cm2
d) 9.75 x 106 km2
e) 9.75 x 1011 km2
d) 6.72 x 105 µm3
e) 6.72 x 1013 µm3
d) 4.28 x 106 dm3
e) 4.28 x 1010 dm3
c) 184 cm2
b) 9.75 x 10-4 km2
c) 9.75 x 103 km2
b) 6.72 x 10-11 µm3
c) 6.72 x 10-6 µm3
b) 4.28 x 10-2 dm3
c) 4.28 x 100 dm3
When expressing the results of a measurement, how many uncertain digits are you allowed to carry in your
reported number?
a) none
26.
e) 516000 mm
Convert 4.28 x 104 cubic millimeters to cubic decimeters.
a) 4.28 x 10-3 dm3
25.
d) 5160 mm
Convert 67.2 cubic centimeters to cubic micrometers.
a) 6.72 x 10-12 µm3
24.
c) 5.16 mm
Convert 97.5 square centimeters to square kilometers.
a) 9.75 x 10-9 km2
23.
b) 0.000516 mm
Convert 1.84 square meters to square centimeters.
a) 0.000184 cm2
22.
e) 48700 dL
Convert 2.45 x 105 milligrams to kilograms.
a) 2.45 x 10-6 kg
21.
d) 487 dL
Convert 17400 micrometers to centimeters.
a) 0.00174 cm
20.
c) 48.7 dL
Convert 0.00516 kilometers to millimeters.
a) 0.00000516 mm
19.
b) 0.0487 dL
b) one
c) two
d) as many as you want
Which of the following describes the significant figures in a measured number?
a) all of the certain digits
b) all of the uncertain digits
c) all of the certain digits plus one uncertain digit
d) all of the uncertain digits plus one certain digit
e) all of the certain digits plus two uncertain digits
27.
How many significant figures are present in the measured quantity 1.80 mL?
a) 1
28.
d) 4
e) 5
b) 2
c) 3
d) infinite
e) indeterminate
b) 3
c) 4
d) 5
e) indeterminate
b) 2
c) 3
d) infinite
e) indeterminate
b) 11 g
c) 11.2 g
d) 11.20 g
e) 11.200 g
When performing the calculation 5.80 g / 1.5 mL =, how should the answer be expressed, keeping significant
figure rules in mind?
a) 4 g/mL
34.
c) 3
When performing the calculation 1.20 g + 10.0 g =, how should the answer be expressed, keeping significant
figure rules in mind?
a) 1 x 101 g
33.
b) 2
How many significant figures are present in the measured quantity 200 mm?
a) 1
32.
e) indeterminate
How many significant figures are present in the measured quantity 10.050 g?
a) 2
31.
d) infinite
How many significant figures are present in the measured quantity 107 mL?
a) 1
30.
c) 3
How many significant figures are present in the measured quantity 0.0090 g
a) 1
29.
b) 2
b) 3.9 g/mL
c) 3.87 g/mL
d) 3.867 g/mL
e) 3.8667 g/mL
When performing the calculation 2.789 m * 15.4 m =, how should the answer be expressed, keeping significant
figure rules in mind?
a) 43 m2
b) 43.0 m2
c) 42.95 m2
d) 42.951 m2
e) 42.9506 m2
35.
When performing the calculation 10.47 m - 3.182 m =, how should the answer be expressed, keeping significant
figure rules in mind?
a) 7 m
36.
b) 7.3 m
c) 7.29 m
d) 7.288 m
e) 7.2880 m
When performing chained calculations (in which the answer to one calculation – called an intermediate answer –
is used as the starting value in another calculation) it is best to
a) round off each intermediate answer to the proper number of significant figures, and used the rounded value
in the next calculation.
b) use the full unrounded value of each intermediate answer in the next calculation, and only round off the
final answer.
37.
What is a mixture?
a) A chemical combination of two or more elements.
b) A kind of matter that can not be separated into other kinds of matter by physical processes.
c) A kind of matter that can not be separated into other kinds of matter by chemical processes.
d) A kind of matter that can be separated into two or more other kind of matter by physical processes.
38.
The law of conservation of mass states that
a) All samples of a pure compound contain the same relative amounts of the constituent elements.
b) Matter can not be created or destroyed.
c) If two elements form more than one compound, then the masses of one element that combine with a
fixed mass of the other element are in the ratio of small whole numbers.
39.
The law of multiple proportions states that
a) All samples of a pure compound contain the same relative amounts of the constituent elements.
b) Matter can not be created or destroyed.
c) If two elements form more than one compound, then the masses of one element that combine with a
fixed mass of the other element are in the ratio of small whole numbers.
40.
The law of definite proportions states that
a) All samples of a pure compound contain the same relative amounts of the constituent elements.
b) Matter can not be created or destroyed.
c) If two elements form more than one compound, then the masses of one element that combine with a
fixed mass of the other element are in the ratio of small whole numbers.
*** END OF EXAM 1 ***