INTRO TO INORGANIC
CHEMISTRY CHEM121 EXAM
The mass of an object is
a measure of the amount of matter in the object
The melting of ice to liquid water is correctly
classified as
a physical change
Which of the following is a chemical property of
matter
flammability
Which of the following substances are composed of
heteroatomic molecules
water
What is a heteroatomic molecule
molecules that do not have the same atoms making up the
molecule.
Table salt, NaCl is best classified as a
compound
What is a compound
2 or more elements chemically combined
After heating, a pure substance, A, is found to
produce B and C. What can be said about substance
A?
It is a compound
Two pure substances A and B react to form a new
pure substance C. From this, we may conclude that
C is a compound, A and B may or may not be elements
Early measurements of length were based on
,dimensions of the human body
The basic unit of length in the metric system is the
meter
The prefix centi- denotes what fraction of a basic unit?
1/100
Convert a temperature of 76 degrees F to a Celsius
value
24 C
(°F − 32) × 5/9 = °C
Which of the following numbers is correctly
expressed using scientific notation?
5.248x10^4
Do the following calculation and express the answer
using correct scientific notation
(2.97x10^2)x(6.09x10^-7)
1.81x10^-4
The number 0.00816 expressed correctly using
scientific notation
8.16x10^-3
How many significant figures are used in expressing a
measurement as 0.2503 L?
four
Which number has the greatest number of significant
digits?
17.5000
Do the following calculation and express the answer
using the correct number of significant figures (342) x
(0.0012) + 100.0
0.0041
Knowing that 1g = 0.035oz and 16oz = 1lb, calculate
the number of grams in 10lbs
, 4.6x10^3
If a student completes 5 problems out of a total of 8 on
a pop quiz, what percentage of the quiz was
completed?
62.5%
If 13% of a class cheats on an exam and there are 93
students in the class, how many students should you
recommend be expelled (to the nearest whole
student)?
12
If urine has a density of 1.08 g/mL, what would be the
mass of 1.000 liters of this material? Express your
answer with the proper number of significant figures.
1.05x10^3 g
general formula D = M/V
On a cold winter day the weather report gives the
temperature as -5.0F. What would this temperature be
if reported on the Kelvin scale?
252 K
Convert to C then to K: (°F − 32) × 5/9 + 273 = 273K
Convert 30.0C to Fahrenheit
86.0
(°C × 9/5) + 32 = °F
What is the meaning of the two (2) in ethyl alchohol,
C2H5OH?
there are two carbon atoms per molecule of ethyl alchohol
Which of the following uses the unit of "u" or "amu"
More than one response is correct
Note: it is atomic weights of atoms and molecular weights
of molecules
CHEMISTRY CHEM121 EXAM
The mass of an object is
a measure of the amount of matter in the object
The melting of ice to liquid water is correctly
classified as
a physical change
Which of the following is a chemical property of
matter
flammability
Which of the following substances are composed of
heteroatomic molecules
water
What is a heteroatomic molecule
molecules that do not have the same atoms making up the
molecule.
Table salt, NaCl is best classified as a
compound
What is a compound
2 or more elements chemically combined
After heating, a pure substance, A, is found to
produce B and C. What can be said about substance
A?
It is a compound
Two pure substances A and B react to form a new
pure substance C. From this, we may conclude that
C is a compound, A and B may or may not be elements
Early measurements of length were based on
,dimensions of the human body
The basic unit of length in the metric system is the
meter
The prefix centi- denotes what fraction of a basic unit?
1/100
Convert a temperature of 76 degrees F to a Celsius
value
24 C
(°F − 32) × 5/9 = °C
Which of the following numbers is correctly
expressed using scientific notation?
5.248x10^4
Do the following calculation and express the answer
using correct scientific notation
(2.97x10^2)x(6.09x10^-7)
1.81x10^-4
The number 0.00816 expressed correctly using
scientific notation
8.16x10^-3
How many significant figures are used in expressing a
measurement as 0.2503 L?
four
Which number has the greatest number of significant
digits?
17.5000
Do the following calculation and express the answer
using the correct number of significant figures (342) x
(0.0012) + 100.0
0.0041
Knowing that 1g = 0.035oz and 16oz = 1lb, calculate
the number of grams in 10lbs
, 4.6x10^3
If a student completes 5 problems out of a total of 8 on
a pop quiz, what percentage of the quiz was
completed?
62.5%
If 13% of a class cheats on an exam and there are 93
students in the class, how many students should you
recommend be expelled (to the nearest whole
student)?
12
If urine has a density of 1.08 g/mL, what would be the
mass of 1.000 liters of this material? Express your
answer with the proper number of significant figures.
1.05x10^3 g
general formula D = M/V
On a cold winter day the weather report gives the
temperature as -5.0F. What would this temperature be
if reported on the Kelvin scale?
252 K
Convert to C then to K: (°F − 32) × 5/9 + 273 = 273K
Convert 30.0C to Fahrenheit
86.0
(°C × 9/5) + 32 = °F
What is the meaning of the two (2) in ethyl alchohol,
C2H5OH?
there are two carbon atoms per molecule of ethyl alchohol
Which of the following uses the unit of "u" or "amu"
More than one response is correct
Note: it is atomic weights of atoms and molecular weights
of molecules
