1. Define the following terms:
a. science
b. chemistry
ANS:
a. Science - a framework for gaining and organizing knowledge. It is a procedure for
processing and understanding certain information.
b. Chemistry - the science that deals with the matter of the universe and the changes it can
undergo.
PTS: 1 DIF: easy TOP: general concepts | definition of chemistry
MSC: general chemistry
2. Define the following terms:
a. scientific method
b. natural law
c. hypothesis
d. theory
ANS:
a. Scientific method - the process or steps of scientific inquiry.
b. Natural law - a statement describing observed behavior.
c. Hypothesis - a possible explanation for an observation.
d. Theory - a set of testsed hypotheses that gives an explanation for some behavior or
observation (also called a model).
PTS: 1 DIF: easy TOP: general concepts | scientific method
KEY: hypothesis | theory MSC: general chemistry
3. Which of the following is not a step in the scientific method?
a. Make an observation.
b. Formulate a hypothesis.
c. Perform an experiment.
d. Change results to agree with your hypothesis.
e. Develop a theory (or model).
ANS: D PTS: 1 DIF: easy
TOP: general concepts | scientific method MSC: general chemistry
4. A __________ is a summary of observed behavior, and a __________ is an explanation of
behavior.
a. law, measurement
b. theory, scientific method
c. theory, law
d. law, theory
e. hypothesis, theory
ANS: D PTS: 1 DIF: easy
TOP: general concepts | scientific method KEY: theory | law
,MSC: general chemistry
, Chapter 02 - Measurements and Calculations
1. Express 1840000 in scientific notation.
a. 5.41 10–8
b. 1.84 10–6
c. 1.84 106
d. 184 106
e. 184 104
ANS: C PTS: 1 DIF: easy
TOP: general concepts | measurement KEY: significant figures | scientific notation
MSC: general chemistry
2. Express 30523000 in scientific notation.
a. 3 107
b. 3.0523 107
c. 305 107
d. 30523 103
e. 305230 107
ANS: B PTS: 1 DIF: easy
TOP: general concepts | measurement KEY: significant figures | scientific notation
MSC: general chemistry
3. Write 8,394 in standard scientific notation.
a. 8394
b. 8.394 10–3
c. 839.4 101
d. 8.394 1000
e. 8.394 103
ANS: E PTS: 1 DIF: easy
TOP: general concepts | measurement KEY: significant figures | scientific notation
MSC: general chemistry
4. The number 0.00003009 expressed in exponential notation is
a. 3.009 10–5
b. 3.0 10–5
c. 3.009 105
d. 3.009 10–4
e. 3.009
ANS: A PTS: 1 DIF: easy
TOP: general concepts | measurement KEY: significant figures | scientific notation
MSC: general chemistry
5. The number 0.002 expressed in exponential notation is
a. 2 103
b. 2 104
c. 2 10–3
d. 2 10–4
e. none of these
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