CHEM 121 - Signficant Figures (SF) rules + calculation rules
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17 Terms
Are non-zero digits significant?
Yes. Non-zero digits are always significant.
How many significant figures are in 357?
3 significant figures.
How many significant figures are in 91?
2 significant figures
Are zeros between non-zero digits significant?
Yes. Zeros between non-zero digits are significant.
How many significant figures are in 101?
3 significant figures.
How many significant figures are in 5006?
4 significant figures.
Are leading zeros significant?
No. Leading zeros are not significant. They only show the position of the decimal.
How many significant figures are in 0.0025?
2 significant figures.
(Scientific notation: 2.5 × 10⁻³)
How many significant figures are in 0.00030?
2 significant figures.
(Scientific notation: 3.0 × 10⁻⁴)
Are trailing zeros significant?
Only if there is a decimal point
How many significant figures are in 250.00?
5 significant figures.
How many significant figures are in 2500.?
4 significant figures.
How many significant figures are in 2500?
2 significant figures
How many significant figures are in 2,000?
1 significant figure
significant figures in calculations
Addition and subtraction rule
result has the same # of decimal places as the measurement with the fewest decimal places
exp. 2.102 + 61.09 + 3.0 = 66.122 → 66.1
^ smallest # (tenths)
significant figures in calculations
multiplication and division rule
The result carries the same # of significant figures as the measurement with the fewest significant figures
exp. 24.66cm * 0.35cm = 8.631 → 8.6 cm²
^ 4 SF ^ 2 SF (smallest)
exp. 21.5cm * 0.30cm / 1.88cm = 3.43085 → 3.4cm
^ 3 SF ^ 2 SF ^ 3 SF