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Published byMarshall Lambert Modified over 8 years ago

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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)

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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 m Significant Figures 0’s

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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

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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 cm 3 4 2 2 4 809 m 2 40 g/mL 35.1 g 0.3 g/cm 3 Quick Quiz! 1.0 g

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