객관식
Which of the following measurements is correctly reported to the appropriate number of significant figures after adding 12.34 g and 0.567 g?
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1. Intro to General Chemistry
Significant Figures: Precision in Measurements
객관식
A student made the following measurements in lab.
| Trial 1 | 2.125 g |
|---|---|
| Trial 2 | 2.123 g |
| Trial 3 | 2.127 g |
A
The measurements are accurate.
B
The measurements are precise.
C
The measurements are both accurate and precise.
D
The measurements are neither accurate nor precise.
검증된 단계별 안내1
Understand the difference between accuracy and precision: Accuracy refers to how close a measurement is to the true or accepted value, while precision refers to how close repeated measurements are to each other.
Examine the given measurements: Trial 1 is 12.125 g, Trial 2 is 12.123 g, and Trial 3 is 12.127 g.
Evaluate precision: Since the measurements are very close to each other, they demonstrate precision. Precision is indicated by the consistency of the measurements.
Consider accuracy: Without a known true or accepted value for comparison, we cannot determine the accuracy of these measurements.
Conclude based on the analysis: Given the closeness of the measurements to each other, we can say for certain that the measurements are precise.
