Date post: | 12-Jan-2016 |
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• measured certain digits.• last digit is estimated, but IS significant.
• do not overstate the precision
5.23 cm
5.230 cm
Significant Figures (Sig Figs)
(uncertain)
1. All nonzero digits are significant.
2. Captive Zeroes between two significant figures are significant.
3. Leading Zeroes at the beginning of a number are never significant.
4. Trailing Zeroes are significant at the end of a number IF there is a decimal.
0.0003700400 mSignificant Figures
0’s
round answers to keep the fewest decimal places
round answers to keep the fewest significant figures
Significant Figures
+ or –
x or ÷
3.48 g + 2.2 g =
6.40 cm x 2.0 cm =
5.68 5.7
12.8 13
1. How many sig figs are in each number?(i) 250.0 mL(ii) 4.7 x 10–5 kg(iii) 34000000 mg(iv) 0.03400 m
2. Round the answer to the correct sig figs. (i) 34.5 m x 23.46 m (ii) 123 g ÷ 3 mL (iii) 23.888897 g + 11.2 g (iv) 3.00g – 2.0 g ÷ 4 cm3
4
224
809 m2
40 g/mL
35.1 g0.3 g/cm3
Quick Quiz!
1.0 g