LUOA chemistry semester exam review
UPDATED Exam Questions and
CORRECT Answers
At the shooting range, a man hits the center of the target three times in a row. Is this accurate,
precise, or both? - CORRECT ANSWER- accurate and precise
A student calculates the volume of a graduated cylinder a...
At the shooting range, a man hits the center of the target three times in a row. Is this accurate,
precise, or both? - CORRECT ANSWER- accurate and precise
A student calculates the volume of a graduated cylinder at 43.26 ml. The actual volume is
42.32 ml. What is the percent error? Show your work below. Round your answer to two
digits.
percent error= |error|/ actual value (100%)
error= measured value - actual value - CORRECT ANSWER- percent error= |error|/ actual
value (100%)
error= measured value - actual value
43.26- 42.32= 0.94 ml
error= 0.94
percent error = |0.94|/ 42.32 (100%)
percent error= 2.2 %
Indicate the number of significant figures in the measured number 0.0020 - CORRECT
ANSWER- 2
Remember to insert commas and decimals as needed. - CORRECT ANSWER- 1.2 x 10^11
Write the following number in scientific notation: 56,000,000 - CORRECT ANSWER- 5.6 x
10^7
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