How many significant figures will be in the final answer of this calculation?
(3.8 - 0.72) × 12.36 =
A.
2
B.
3
C.
4
D.
6
E.
none of the above
How many square kilometers are equivalent to 28.5 cm2?
A.
2.85 × 10-6 km2
B.
2.85 × 10-9 km2
C.
285 km2
D.
None of these.
E.
2.85 × 10-4 km2
What is the value of 62 °C in °F?
A.
289.82
B.
16.67
C.
335.15
D.
143.6
E.
none of the above
A chemical mixture is distinguished from a chemical compound in that:
A.
there is no significant difference between the two.
B.
the properties of a chemical mixture are unique and unlike that of any of the components of the mixture.
C.
there are no chemical bonds within a chemical mixture.
D.
chemical compounds may be found in a chemical mixture.
How many significant figures are in the number 0.01020?
A.
2
B.
6
C.
3
D.
5
E.
4
The freezing point of methane is -295 °F and the boiling point is -263 °F.
The temperature of the surface of Titan, a moon of Saturn, is 93 K.
If methane exists on Titan, it is:
A.
a solid.
B.The given values of the boiling and freezing points of methane are for Earth and the temperatures would be different on Titan, so we could not know the answer.
C.
a liquid.
D.
a gas.
How many significant figures will be in the final answer of this calculation?
12.809 × 19.1 = ________
A.
8
B.
5
C.
4
D.
3
E.
none of the above
In the measurement 236.9781 inches, which digit is estimated?
A.
2
B.
6
C.
9
D.
1
E.
None of the above, all digits are certain.
According to the scientific method, what is a law?
A.
A model that gives insight into how nature is.
B.
A fact that can never be refuted.
C.
An initial guess with explanatory power.
D.
A short statement that summarizes a large number of observations.
Which of these shows 4.0 m2 converted into cm2?
A.
4.0 x 104
B.
4.0 x 103
C.
4.0 x 10-4
D.
4.0 x 10-2
E.
4.0 x 102
Liquids A, B, and C are insoluble in one another (i.e., they are immiscible).
A, B, and C have densities of 0.998 g/cm3, 1.050 g/cm3, and 1.102 g/cm3, respectively.
Which drawing represents the result of placing all three liquids into the same graduated cylinder?
A.
a
B.
c
C.
d
D.
b
According to the explanation given in the text, one of the following would NOT be a fitting 4.0/ 4.0 Points definition for chemistry.
Which one of the following is not a good definition or description of this branch of science?
A.
all of the above are good definitions of chemistry
B.
the study of life
C.
the study of the substance(s) that composes all things and how it interacts D.
the study of atoms and molecules
E.
the science of matter and how it responds to the environment
Where can you find chemicals?
A.
all around you and even inside you.
B.
all of these.
C.
in a hardware store.
D.
in a chemical stockroom.
A tentative explanation for a set of observations that can be tested by further experimentation is referred to as:
A.
a law.
B.
a hypothesis.
C.
a theory.
D.
none of these.
Which statement below can best be classified as a scientific law?
A.
none of the above could be considered a law.
B.
sugars are made of carbon, hydrogen, and oxygen atoms.
C.
Life on earth likely began around 3.5-4 billion years ago.
D.Within a certain distance from each other, objects with a small mass accelerate towards an object with a larger mass.
E.
The moon travels around the Earth at a high speed.
The density of copper is 8.96 g/cm3.
What is the mass in mg of a cube of copper that measures 2.31 mm on each side?
A.
2.07 mg
B.
0.0207 mg
C.
0.110 mg
D.
110.
mg
The correct number of significant figures in the number 0.080 x 10-7 is
A.
4
B.
3
C.
2
D.
ambiguous
E.
none of the above
What is the value of 39°C on the Fahrenheit temperature scale?
A.
312.15
B.
102.2
C.
7
D.
3.89
E.
none of the above
An element is a substance that:
A.
is a gas at room temperature.
B.
cannot be decomposed into two or more pure substances.
C.
is composed of two or more different substances.
D.
can be separated into two or more pure substances.
Which characteristic is necessary for success in understanding chemistry?
A.
practice.
B.
curiosity.
C.
all of these are keys to success.
D.
not procrastinating.
E.
commitment.
F.
asking questions.
G.
mathematical skills.
`Which of the following would not be considered a compound?
A.
water
B.
carbon dioxide
C.
salt
D.
sugar
E.
all of these are compounds
Glycerol changes its shape to conform to its container and has a fairly high density.
Glycerol is a:
A.
solid.
B.
either liquid or gas.
C.
liquid.
D.
gas.
Which of these represents a physical property?
A.
the combustion of grilled cheese (now that's a fun experiment!) B.
rusting of a nail
C.
the caustic (corrosive) action of sodium hydroxide on aluminum D.
the taste of sodium chloride
E.
none of the above
Hydrogen is an example of:
A.
an atom.
B.
a molecule.
C.
a bond.
D.
a mixture.
Oxygen is an example of:
A.
a mixture.
B.
a molecule.
C.
a bond.
D.
an atom.