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Class notes CHEM 101

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General chemistry notes covering SI Units, significant figures, sig figs in calculations, and dimensional analysis.

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  • August 21, 2024
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  • 2022/2023
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WI Monday Lecture
Chemistry
SI s steme International Units
subset of metric units
What Unit Symbol
Length meter m
Mass kilogram kg
temp Kelvin K
time seconds s
amount mole Mol

they have prefixes
prefix Symbol Multiple
giga O 10
mega 106
Kilo K 103
2
centi C 10
Milli M 10 3
micro M 10 6
a
nano N 10
12
pico p 10
femto f 10 is
8
at to a 10

Density expressed in compound units

d f
Joule SI unit ofenergy

1J lime
SignificantFigures SigFigs
Data reported with value and uncertainty
ex 765 4310.21
avoid the I byusing sigfigs
YOUHAVEUSEDTHERIGHTNUMBER IF ONLYTHELASTDIGITHAS UNCERTAINTY
ex 765.4 or 7.654.102 scientificnotation
This has 4 Sigfigs
Rulesfordetermining sigfigs in a measuredquantity
1 all nonzerodigitsandallzeroes betweennonzerodigits are significant
902L has 3 Sigfigs
2 zeros usedonly to position the decimal are not significant

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