Which of these are examples of correctly written measurements?Group of answer choices12.05 mL(12.05 ± 0.2) mL(12.0 ± 0.02) mL(12.05 ± 0.02) mL(12.0 ± 0.2) mL
Question
Which of these are examples of correctly written measurements?Group of answer choices12.05 mL(12.05 ± 0.2) mL(12.0 ± 0.02) mL(12.05 ± 0.02) mL(12.0 ± 0.2) mL
Solution 1
The correctly written measurements are:
- 12.05 mL
- (12.0 ± 0.2) mL
The reason is that the uncertainty (the value after the ± sign) should only have one significant figure. Also, the last significant figure in the measurement (the value before the ± sign) should be in the same decimal place as the uncertainty.
In the case of (12.05 ± 0.2) mL, (12.0 ± 0.02) mL, and (12.05 ± 0.02) mL, the uncertainty has more than one significant figure or the last significant figure in the measurement is not in the same decimal place as the uncertainty, so they are not correctly written.
Solution 2
The correctly written measurements are:
- 12.05 mL
- (12.0 ± 0.2) mL
The reason is that the uncertainty (the value after the ± sign) should only have one significant figure. Also, the last significant figure in the measurement (the value before the ± sign) should be in the same decimal place as the uncertainty.
In the case of (12.05 ± 0.2) mL, (12.0 ± 0.02) mL, and (12.05 ± 0.02) mL, the uncertainty has more than one significant figure or the last significant figure in the measurement is not in the same decimal place as the uncertainty, so they are not correctly written.
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