Introduction to Chemistry Final Exam Questions With
Complete Solutions
______ properties of matter can be measured only when matter
changes to different substances. Correct Answers chemical
92 of these occur naturally. Correct Answers elements
A 20-kg object with a volume of 2 meters cubed has a density of
______. Correct Answers 10 kg/m^3
A change in the size or shape of matter is a ______ change in
matter. Correct Answers physical
A hot air balloon at 81,000 feet pops. Why ? Correct Answers
pressure was so low, volume increased and popped it.
A line graph shows data from an experiment in which the
independent variable is the volume of a
gas and the dependent variable is the pressure on the gas. The
slope of the line falls from left to right. What does an analysis of
the graph reveal about the relationship between the volume of a
gas and the pressure on it? Correct Answers as volume
decreases, pressure increases
A log burning is an example of a ______ change in matter.
Correct Answers chemical
A possible sign that a chemical change has occurred is a change
in Correct Answers color
,A scientist conducts an experiment and finds that the
acceleration of a car decreases as the mass of the car increases
(when all other variables are held constant). What could the
scientist conclude from this investigation? Correct Answers
There is an inverse relationship between acceleration and mass.
A sodium atom has 2 electrons on the innermost electron level, 8
on the middle one, and 1 valence electron. A chlorine atom has 2
electrons on the innermost electron level, 8 on the middle one,
and 7 valence electron. How many electrons would each of the
atoms have once they join to form table salt (NaCl), and how are
they arranged? Correct Answers the sodium atom has 2
electrons on the innermost electron level and 8 valence
electrons, and the chlorine atom has 2 electrons on the innermost
electron level, 8 on the middle one, and 8 valence electrons.
A solid changes directly to a gas in the process of ______ .
Correct Answers sublimation
A student is investigating how temperature affects bacterial
growth. Which of these would be an appropriate hypothesis to
formulate based on these variables? Correct Answers an
increase in temperature causes the rate of bacterial growth to
increase
A student measured the mass of a candle before and after
burning it and found the mass to be lower after burning than
before. How can this be best explained? Correct Answers some
of the products were gases which escaped and were not
measured.
, A student observes a boulder rolling down a hill. He
hypothesizes that a boulder with greater mass will roll down the
same hill faster. He designs an experiment to test this
hypothesis. In the experiment, what should be the independent
variable? Correct Answers the mass of the boulder
A student performs an experiment with a gas in which the
independent variable is volume and the dependent variable is
pressure. The graph that he created using his data showed a
negative exponential trend. What trend should the student
report? Correct Answers As the volume of a gas increases, the
pressure on the gas decreases.
A student sets up an experiment to determine how much time
will elapse before equal samples of water at 20 ° C become solid
if placed in freezers set at four different temperatures. Which are
the independent and dependent variables in this experiment?
Correct Answers the various temperatures in the freezers, and
the time it takes the water to freeze
A student wants to investigate if there is a relationship between
car tire friction and air pressure in tires. If the student is
following the scientific method, what should she do next?
Correct Answers Conduct research to obtain any information
that already exists on this topic.
A(n) ______ consists of atoms or molecules that spread out to
fill their container. Correct Answers gas
Complete Solutions
______ properties of matter can be measured only when matter
changes to different substances. Correct Answers chemical
92 of these occur naturally. Correct Answers elements
A 20-kg object with a volume of 2 meters cubed has a density of
______. Correct Answers 10 kg/m^3
A change in the size or shape of matter is a ______ change in
matter. Correct Answers physical
A hot air balloon at 81,000 feet pops. Why ? Correct Answers
pressure was so low, volume increased and popped it.
A line graph shows data from an experiment in which the
independent variable is the volume of a
gas and the dependent variable is the pressure on the gas. The
slope of the line falls from left to right. What does an analysis of
the graph reveal about the relationship between the volume of a
gas and the pressure on it? Correct Answers as volume
decreases, pressure increases
A log burning is an example of a ______ change in matter.
Correct Answers chemical
A possible sign that a chemical change has occurred is a change
in Correct Answers color
,A scientist conducts an experiment and finds that the
acceleration of a car decreases as the mass of the car increases
(when all other variables are held constant). What could the
scientist conclude from this investigation? Correct Answers
There is an inverse relationship between acceleration and mass.
A sodium atom has 2 electrons on the innermost electron level, 8
on the middle one, and 1 valence electron. A chlorine atom has 2
electrons on the innermost electron level, 8 on the middle one,
and 7 valence electron. How many electrons would each of the
atoms have once they join to form table salt (NaCl), and how are
they arranged? Correct Answers the sodium atom has 2
electrons on the innermost electron level and 8 valence
electrons, and the chlorine atom has 2 electrons on the innermost
electron level, 8 on the middle one, and 8 valence electrons.
A solid changes directly to a gas in the process of ______ .
Correct Answers sublimation
A student is investigating how temperature affects bacterial
growth. Which of these would be an appropriate hypothesis to
formulate based on these variables? Correct Answers an
increase in temperature causes the rate of bacterial growth to
increase
A student measured the mass of a candle before and after
burning it and found the mass to be lower after burning than
before. How can this be best explained? Correct Answers some
of the products were gases which escaped and were not
measured.
, A student observes a boulder rolling down a hill. He
hypothesizes that a boulder with greater mass will roll down the
same hill faster. He designs an experiment to test this
hypothesis. In the experiment, what should be the independent
variable? Correct Answers the mass of the boulder
A student performs an experiment with a gas in which the
independent variable is volume and the dependent variable is
pressure. The graph that he created using his data showed a
negative exponential trend. What trend should the student
report? Correct Answers As the volume of a gas increases, the
pressure on the gas decreases.
A student sets up an experiment to determine how much time
will elapse before equal samples of water at 20 ° C become solid
if placed in freezers set at four different temperatures. Which are
the independent and dependent variables in this experiment?
Correct Answers the various temperatures in the freezers, and
the time it takes the water to freeze
A student wants to investigate if there is a relationship between
car tire friction and air pressure in tires. If the student is
following the scientific method, what should she do next?
Correct Answers Conduct research to obtain any information
that already exists on this topic.
A(n) ______ consists of atoms or molecules that spread out to
fill their container. Correct Answers gas
