CHEM 130 Final Exam with Correct
and Revised Answers 2025-2026
Updated.
what is chemistry? - Answer the study of matter
hypothesis - Answer a tentative explanation for a single or small number of observations.
can be validated or invalidated by experiments.
law - Answer a brief statement that summarizes many past observations and predicts future
ones. can be validated or invalidated by experiments (laws don't explain why but summarize
with a statement)
theory - Answer also called model. a broad and deep explanation for a large number of
observations. consists of a set of extensively-tested hypothesis. widely accepted model that be
used to predict behavior. can be validated/invalidated
Which of these statements about the scientific method is NOT true? - Answer a law can also
be described as a model
Based on a limited number of experimental observations, Walter White makes the following
statement: "The yield of my latest batch of methamphetamine was 15% lower than expected
because the heating bath failed to maintain a consistent temperature." This statement is an
example of a: - Answer hypothesis
accurate - Answer if its close to the true (accepted value)
precise - Answer if the measurements are closely spaced
2.49 g, 2.50 g, 2.52 g, 2.49 g (avg = 2.50 g) true value = 2.50 - Answer precise and accurate
2.49 g, 2.50 g, 2.52, 2.49 (avg=2.50) true value= 3.77 g - Answer precise but not accurate
1.19 g, 1.62 g, 1.40 g, 1.79 g (avg=1.50g) true value= 2.50 g - Answer not accurate and not
, write 0.003925 in scientific notation - Answer 3.925 x 10^-3
write 12,756.1 in scientific notation - Answer 1.27561 x 10^4
write 0.00002093 in scientific notation - Answer 2.093 x 10^-5
write 5.928 x 10^-3 in standard notation - Answer 0.005928
The average width of a single human hair is 0.000099 meters. Express this measurement in
scientific notation - Answer 9.9 x 10^-5
The number 300.30 x 10^-3 when expressed in correct scientific notation is? - Answer
3.0030 x 10^-1
Which digits are significant? - Answer all nonzero digits, interior zeros, trailing zeros after a
decimal point
Which digits are not significant? - Answer leading zeros (0.00962 zeros not sig)
What have infinite # of sig figs? - Answer counting discrete objects (4 atoms), defined
quantities (1m=100cm exact), exact numbers (radius = diameter/2)
12,560 mi - Answer doubt -> 1.2560 x 10^4 .......5 sig figs
0.00298050 - Answer 6 sig figs
10 dozen - Answer infinite sig figs
1.4270 x 10^18 - Answer 5 sig figs
The measurement 0.05012030 kj rounded to four sig figs is: - Answer 0.05012 kj
and Revised Answers 2025-2026
Updated.
what is chemistry? - Answer the study of matter
hypothesis - Answer a tentative explanation for a single or small number of observations.
can be validated or invalidated by experiments.
law - Answer a brief statement that summarizes many past observations and predicts future
ones. can be validated or invalidated by experiments (laws don't explain why but summarize
with a statement)
theory - Answer also called model. a broad and deep explanation for a large number of
observations. consists of a set of extensively-tested hypothesis. widely accepted model that be
used to predict behavior. can be validated/invalidated
Which of these statements about the scientific method is NOT true? - Answer a law can also
be described as a model
Based on a limited number of experimental observations, Walter White makes the following
statement: "The yield of my latest batch of methamphetamine was 15% lower than expected
because the heating bath failed to maintain a consistent temperature." This statement is an
example of a: - Answer hypothesis
accurate - Answer if its close to the true (accepted value)
precise - Answer if the measurements are closely spaced
2.49 g, 2.50 g, 2.52 g, 2.49 g (avg = 2.50 g) true value = 2.50 - Answer precise and accurate
2.49 g, 2.50 g, 2.52, 2.49 (avg=2.50) true value= 3.77 g - Answer precise but not accurate
1.19 g, 1.62 g, 1.40 g, 1.79 g (avg=1.50g) true value= 2.50 g - Answer not accurate and not
, write 0.003925 in scientific notation - Answer 3.925 x 10^-3
write 12,756.1 in scientific notation - Answer 1.27561 x 10^4
write 0.00002093 in scientific notation - Answer 2.093 x 10^-5
write 5.928 x 10^-3 in standard notation - Answer 0.005928
The average width of a single human hair is 0.000099 meters. Express this measurement in
scientific notation - Answer 9.9 x 10^-5
The number 300.30 x 10^-3 when expressed in correct scientific notation is? - Answer
3.0030 x 10^-1
Which digits are significant? - Answer all nonzero digits, interior zeros, trailing zeros after a
decimal point
Which digits are not significant? - Answer leading zeros (0.00962 zeros not sig)
What have infinite # of sig figs? - Answer counting discrete objects (4 atoms), defined
quantities (1m=100cm exact), exact numbers (radius = diameter/2)
12,560 mi - Answer doubt -> 1.2560 x 10^4 .......5 sig figs
0.00298050 - Answer 6 sig figs
10 dozen - Answer infinite sig figs
1.4270 x 10^18 - Answer 5 sig figs
The measurement 0.05012030 kj rounded to four sig figs is: - Answer 0.05012 kj
