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Published bySherman Hawkins Modified over 5 years ago

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Significant Digits Ch 1 Notes

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Significant Digits Used to round measured values when involved in calculations When in scientific notation, all numbers on left side of number are significant

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Significant Digits Nonzero #’s are always significant 3493 sig figs 16394 sig figs

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Significant Digits Leading Zeros are never significant 0.00552 sig figs 0.00000003933 sig figs Captive Zeros are always significant 59084 sig figs 21000047 sig figs

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Significant Digits Trailing Zeros are significant IF there is a decimal point in the # 8001 sig fig 29002 sig figs 800.04 sig figs 2900.4 sig figs

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Operations with Sig Figs Multiplication/Division rule: Retain the same number of sig figs in the answer as the factor containing the least number of sig figs. 4.5 x 2 = 9.0 rounds to 9 2000 x 21 = 42000rounds to 40000 11 x 3 x 212 = 6996 rounds to 7000

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Operations with Sig Figs Addition/Subtraction Rule leave the answer rounded to the same precision (same decimal place) as the least precise number involved in the operation. 2 + 2.3 = 4.3 rounds to 4 120 + 11 = 131 rounds to 130 1.65 + 3 – 2.90 = 1.75 rounds to 2

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Sig Fig Examples #1: 23.0 4.25 4.25 + 25,620 #2:2.3 x 10 -4 316 316

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Examples Solutions #1: 23.0 4.75 4.75 + 25,620 25,647.75 25,647.75 rounds to 25,650 #2:2.3 x 10 -4 2sf 316 3sf =7.27 x 10 -7 rounds to 7.3 x 10 -7

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Sig Fig Situation #1: Let’s Not But Say We Did Don’t worry about rounding combo problems until all the work in the calculator is done, but heed the rules as if you did to find out # of digits needed in the end: (3.5 + 2.9454) / 357 = (6.4454)/357 = 0.018054341 Rounding: addition to tenths digit, which would leave 2 sig figs. 2 sig figs divided by 3 sig figs leaves 2 in answer: 0.018

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Sig Fig Situation #2: Less than Zero 2000 (1 sig fig) vs. 2001 (4 sig figs) What if you want 2000 to have 4 sig figs like 2001? 2.000 x 10 3 for 4 sig figs 2.00 x 10 3 for 3 sig figs 2.0 x 10 3 for 2 sig figs 2 x 10 3 for 1 sig fig

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Sig Figs Situation #3: Exact #’s Whenever a quantity has no uncertainty, it does not affect the # of sig figs in answer if x/÷/+/- Ex: four sides of a square…if one side has a length of 2.0 m, then 4 (exact #) x 2.0 m = 8.0 m (retain two sig figs cause exact # doesn’t matter to sig fig rounding

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Sig Figs Situation #4: Units! Units are to be treated in the same algebraic sense as variables Units do not affect sig figs but must be common to add/subtract values 23 g + 32.00 g = 55.00 rounds to 55 g 23 g x 32.00 g = 736.0000 rounds to 740 g 2 23 kg + 27 ml cannot be simplified

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