Multiple Choice
How many significant figures are present in the measurement 0.020 km?
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1. Intro to General Chemistry
Significant Figures
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How many significant figures are present in an exact number?
A
An exact number has one significant figure.
B
An exact number has an infinite number of significant figures.
C
An exact number has zero significant figures.
D
An exact number has the same number of significant figures as a measured value.
Verified step by step guidance1
Understand the definition of an exact number: An exact number is a value that is known with complete certainty, often because it is defined or counted, not measured.
Recall that significant figures represent the precision of a measured quantity, indicating how many digits are known reliably.
Recognize that exact numbers are not subject to measurement uncertainty, so they are considered to have infinite precision.
Therefore, exact numbers are treated as having an infinite number of significant figures because they do not limit the precision of calculations.
Conclude that among the given options, the correct understanding is that an exact number has an infinite number of significant figures.
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