Significant Figures & Scientific Notation Significant Figures & Scientific Notation.
Scientific Notation Scientific Notation: a method for __________________________________________....
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Transcript of Scientific Notation Scientific Notation: a method for __________________________________________....
![Page 1: Scientific Notation Scientific Notation: a method for __________________________________________. Moving the decimal to the _______________exponent, to.](https://reader036.fdocuments.in/reader036/viewer/2022081803/56649e7a5503460f94b7a5cf/html5/thumbnails/1.jpg)
Ch. 2 Math Review
![Page 2: Scientific Notation Scientific Notation: a method for __________________________________________. Moving the decimal to the _______________exponent, to.](https://reader036.fdocuments.in/reader036/viewer/2022081803/56649e7a5503460f94b7a5cf/html5/thumbnails/2.jpg)
Scientific Notation Scientific Notation: a method for
__________________________________________.Moving the decimal to the
_______________exponent, to the _________________________________________.
Ex. 0.00527g = 5.27 x 10-3 g52700000 m = 5.27 x 107 m
3.25 x 10-6 cm3 = 0.00000325 cm3
3.25 x 104 cm3 = 32500cm3
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![Page 3: Scientific Notation Scientific Notation: a method for __________________________________________. Moving the decimal to the _______________exponent, to.](https://reader036.fdocuments.in/reader036/viewer/2022081803/56649e7a5503460f94b7a5cf/html5/thumbnails/3.jpg)
Scientific NotationPractice:
1) 0.000060731 ml =
2) 2.970 x 10-5 mg =
3) 546901000 kg =
4) 6.3 x 107 s =2-3
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Rounding Atomic MassesRounding Atomic Masses: we will be
rounding the atomic masses off the periodic table to the __________________________________________
Ex. C = 12.011 g/mol = 12.01 g/mol
Bi = 208.98038 g/mol = 208.98 g/mol
K = 39.0983 g/mol = 39.10 g/mol
![Page 5: Scientific Notation Scientific Notation: a method for __________________________________________. Moving the decimal to the _______________exponent, to.](https://reader036.fdocuments.in/reader036/viewer/2022081803/56649e7a5503460f94b7a5cf/html5/thumbnails/5.jpg)
Rounding Atomic MassesPractice:
5) N = 14.00674 g/mol =
6) Si = 28.0855 g/mol =
7) O = 15.9994 g/mol =
8) Ar = 39.948 g/mol = 2-5
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Significant Figures Non zeros are always ____________________. Zeros _____________________are significant. Leading and trailing zeros
___________________________________.Atlantic/Pacific Rule:
Pacific: Point Present, start from the left, first nonzero and everything after is significant
Atlantic: Point Absent, start from the right, first nonzero and everything after is significant.
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Significant Figures Ex. 1200 = 2 sig figs 0.003 = 1 sig fig
1.200 = 4 sig figs 0.0030 = 2 sig figs
Practice:9) 1.2650 = 10) 325000 =
11)1.280 x 10-1 = 12) 31006 =
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Significant FiguresRounding Calculations According to Sig Figs
Addition and Subtraction: Round answers to the _____________________________________________:
Ex. 2.2 6.9801 + 5.67 - 4.21
7.87 = 7.9 2.7701 = 2.77
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Significant FiguresPractice:
13)4.71 - 1.1
14)5.367 + 1.2
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Significant FiguresMultiplication and Division: Round answers
to the _______________________________________________________________________________________:
Ex. 2.60 x 300 = 780 = 80052.31 x 2600 = 136006 = 140000
2000000 ÷ 5.63 = 355239.7869 = 4000000 78 ÷ 6 =13 = 10
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Significant Figures Practice:15)240. ÷ 6.0 =
16) 365 ÷ 5 =
17)32 ÷ 3 =
18)32 x 3.0 = 2-11
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Dimensional AnalysisUsed to convert between units. Take an equivalent (12 in. = 1 ft.) and make it into a __________________:
1 ft. or 12 in.12 in. 1 ft.
Use conversion factors to convert between units. _______________________________________________and multiply by the conversion factor with _____________________________________________. (so they cancel)
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Dimensional Analysis Ex. 5.36 ft. = ? in.
5.36 ft. x 12 in. = 64.32 in. = 64.3 in. 1 ft.
32 in. = ? ft.
32 in. x 1 ft. = 2.666 ft. = 2.7 ft. 12 in.
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Dimensional Analysis Ex. 3.26 in. = ? cm
3.26 in. x 1 cm= 8.280416561 cm = 8.28 cm 0.3970 in.
25 g = ? kg just use your handout, move your decimal 3 places to the left 25 g = 0.025 kg
5.69 oz. = ? g5.69 oz. x 28.3 g= 161.027 g = 161 g 1 oz.
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Dimensional Analysis Ex. 1 year = ? S
1 year x 365 days x 24 hours x 60 min. X 60 s =
1 yr. 1 day 1 hr. 1 min.
= 31536000 s = 30000000 s
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