Multiple Choice
Which of the following weights is recorded with the correct number of significant figures if the measuring device reports to the nearest tenth of an ounce?
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1. Intro to General Chemistry
Significant Figures
Multiple Choice
In which of the following pairs do both numbers contain the same number of significant figures?
A
0.00450 and 2.30
B
100.0 and 10.0
C
1.200 and 12.0
D
0.040 and 0.004
Verified step by step guidance1
Recall the rules for counting significant figures: all nonzero digits are significant; zeros between nonzero digits are significant; leading zeros are not significant; trailing zeros in a decimal number are significant.
Count the significant figures in each number of the first pair: 0.00450 has 3 significant figures (the '4', '5', and the trailing zero), and 2.30 has 3 significant figures (the '2', '3', and the trailing zero).
Count the significant figures in each number of the second pair: 100.0 has 4 significant figures (the '1', two zeros, and the decimal zero), and 10.0 has 3 significant figures (the '1', zero, and the decimal zero).
Count the significant figures in each number of the third pair: 1.200 has 4 significant figures (the '1', '2', and two trailing zeros), and 12.0 has 3 significant figures (the '1', '2', and the trailing zero).
Count the significant figures in each number of the fourth pair: 0.040 has 2 significant figures (the '4' and the trailing zero), and 0.004 has 1 significant figure (the '4' only). Compare the counts to identify which pair has matching significant figures.
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