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Which of the following is an example of a chemical change?
A)
ice subliming (i.e., vaporizing without melting)
B)
water rushing down rapids
C)
new leaves appearing on a plant
D)
an iron bar becoming red hot
E)
two magnets attracting
In which of the following processes is there a decrease in the potential energy of the substances involved?
A)
a coil spring is compressed
B)
two particles of opposite charge are separated
C)
photosynthesis produces glucose from carbon dioxide and water
D)
liquid water evaporates to form water vapor
E)
methane gas burns in oxygen to form carbon dioxide and water
Which of the following processes and concepts is not a part of the "scientific method"?
A)
experiment
B)
observation
C)
model
D)
speculation
E)
law
If a rectangle measures 4.00 inches by 5/6 inch, what is its area in square centimeters?
A)
1.31 cm2
B)
3.33 cm2
C)
8.47 cm2
D)
21.5 cm2
E)
none of the above
The speed of light is 3.0 x 108 m/s. How many milliseconds does it take for a light signal from earth to reach and return from a satellite that is in orbit 30 miles above the earth? (1 millisecond = 10-3 seconds)
A)
320 milliseconds
B)
16 milliseconds
C)
32 milliseconds
D)
0.32 milliseconds
E)
0.16 milliseconds
Isopropyl alcohol, commonly known as rubbing alcohol, boils at 180.°F. What is the boiling point in kelvins?
A)
373.2 K
B)
355.4 K
C)
100.0 K
D)
82.2 K
E)
none of the above
Calculate the temperature, in degrees Celsius, for which the Kelvin and Fahrenheit scales have the same numerical value. (Read the question carefully!)
A)
-40 °C
B)
100 °C
C)
193 °C
D)
273 °C
E)
301 °C
The S.I. base unit of mass is the
A)
ounce
B)
gram
C)
kilogram
D)
metric ton
E)
none of the above
The SI prefixes mega and nano represent, respectively:
A)
106 and 10-3
B)
106 and 10-6
C)
106 and 10-9
D)
103 and 109
E)
none of the above
The density of magnesium is 1.7 g/cm3, while that of iron is 7.9 g/cm3. A block of iron has a mass of 819 g. What is the mass of a block of magnesium that has the same volume as the block of iron?
A)
4.7 g
B)
1.8 x 102 g
C)
3.8 x 102 g
D)
4.8 x 103 g
E)
none of the above
A rectangular wooden block, 22 cm x 13.2 cm x 4.4 cm, has a mass of 1562.0 g. The density of the wood in kg/m3 is:
A)
1.2 x 10-1 kg/m3
B)
1.2 x 102 kg/m3
C)
1.2 x 103 kg/m3
D)
1.2 x 109 kg/m3
E)
none of the above
The product 12.5 x 2134.5 has ______ significant figures and is correctly written in scientific notation as _______.
A)
3, 2.67 x 104
B)
3, 2.67 x 107
C)
5, 2.6681 x 104
D)
5, 2.6681 x 107
E)
6, 2.66812 x 104
How many decimal places should be used to express the value of x?
x = 23 + 16.9 - 0.8653?
A)
none
B)
one
C)
two
D)
three
E)
four
A student measures the density of a liquid several times and obtains essentially identical answers each time. The answers do not agree with the known density of the liquid. Based on this information, which of the following is a valid conclusion?
A)
The student has made a calculational error each time.
B)
The apparatus used by the student has not been properly calibrated.
C)
The liquid sample used by the student is contaminated.
D)
The student's results are imprecise.
E)
None of the above.
The number 106.10200 is correctly written in scientific notation as
