2321.
What is the result of the following calculation, reported to the correct number of significant figures? 0.12g + 0.003g = ?
A
0.123g
B
0.12g
C
0.1g
D
0.g
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What is the result of the following calculation, reported to the correct number of significant figures? 0.12g + 0.003g = ?
0.123g
0.12g
0.1g
0.g
The reason for organizing, analyzing, and classifying data is
so that computers can be used.
to prove a law.
to find relationships among the data.
to separate qualitative and quantitative data.
The intensive physical properties of a substance are important because they:
allow us to determine how much of the substance is required in a chemical reaction.
help us identify or characterize the substance.
provide information about the atomic structure of the substance.
The accepted value is 29.35. Which correctly describes this students experimental data? Trial 1: Measurement 29.48; Trial 2: Measurement 28.97; Trial 3: Measurement 29.27
accurate but not precise
precise but not accurate
both accurate and precise
neither accurate nor precise
The accepted value is 15.63. Which correctly describes this students experimental data? Trial 1: Measurement 12.84; Trial 2: Measurement 13.02; Trial 3: Measurement 12.96
accurate but not precise
precise but not accurate
both accurate and precise
neither accurate nor precise
The accepted value is 1.43. Which correctly describes this students experimental data? Trial 1: Measurement 1.29; Trial 2: Measurement 1.93; Trial 3: Measurement 0.88
accurate but not precise
precise but not accurate
both accurate and precise
neither accurate nor precise
Systematic errors lead to a lack of:
accuracy in the measurement.
significant digits in the measurement.
precision in the measurement.
gradation of the measuring instrument
Precision pertains to all of the following except
reproducibility of measurements.
agreement among numerical values.
sameness of measurements.
closeness of a measurement to an accepted value.
Poor precision in scientific measurement may arise from
the standard being too strict.
human error.
limitations of the measuring instrument.
both human error and the limitations of the measuring instrument.
How many significant figures does the following measurement contain? Temperature = 0.0023 degree Centigrade
2
3
4
infinite
How many significan figures does the following measurement contain?3 coins
1
2
3
infinite
Five darts strike near the center of the target. Whoever threw the darts is
accurate.
precise.
both accurate and precise.
neither accurate nor precise.
A chemist who frequently carries out a complex experiment is likely to have high
accuracy, but low precision.
accuracy.
precision.
precision, but low accuracy.