Multiple Choice
Which of the following measurements has the greatest precision?
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1. Intro to General Chemistry
Significant Figures: Precision in Measurements
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Read the length of the pencil to the correct number of significant figures.
A
8.0 cm
B
8.000 cm
C
9 cm
D
9.0 cm
E
9.00 cm
Verified step by step guidance1
Observe the image of the pencil aligned with the ruler. The pencil's tip is aligned with the 9 cm mark on the ruler.
Note that the ruler has markings for each millimeter, allowing for a more precise measurement than just whole centimeters.
Since the pencil's tip is exactly on the 9 cm mark, we can determine the length to be 9.00 cm, indicating precision to the hundredths place.
The number of significant figures is determined by the precision of the measurement. Here, 9.00 cm has three significant figures.
Thus, the correct length of the pencil, considering the precision of the ruler, is 9.00 cm.
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