Chemistry: Matter and Change

Section 3: Uncertainty in Measurements and Calculations

Self Check Quizzes

1
Why are plus and minus signs ignored in calculating percent error?
A)Accepted values for data do not include negative numbers.
B)An experimental value smaller than the accepted value is not considered an error.
C)Only the size of the error matters, not whether the values in error are larger or smaller than the accepted values.
D)The formula for percent error automatically cancels out the signs.
2
The sum of 4.824 + 2.03 + 4.72319 + 123.4567 + 111.1 expressed to the proper number of significant figures is ____________.
A)246
B)246.1
C)246.13
D)246.134
3
The closeness of an experimental value to an accepted value is its ______.
A)accuracy
B)precision
C)percent error
D)error
4
What is the percent error if a measured value is 24.59 g/mL and the accepted value is 25.49 g/mL?
A)0.9647
B)1.037
C)0.0366
D)3.5%
5
How many significant figures will there be when the density value is calculated from the following data? mass = 24.47g; volume =13.2 mL
A)2
B)3
C)4
D)5
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