Summary

Summary CHEM131 Significant Figures and Dimensional Analysis

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Course
CHEM131

Institution
University Of Maryland - College Park

Rules of using significant figures in calculations. Various conversions and dimensional analysis to convert units in calculations.

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Uploaded on September 3, 2024
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Discussion 8129/24

measurement an someone
wa
decont
-
the art is unknown , the unit is known
now
to pl
-

Chemistry uses the SI system

-
length = m Cmeter)
,
time = S(sec) , mass =
kg (kil) ,
temp = K <Kelvin)
,

amount = mol ,
Current = A Ccmp) , luminosity = Cd (candela)

Dimensional Analysis
-
check you have the right reits

-
length = 1 ,
mass = M , temp = - , time = T ,
ant = 1 ,
current = I ,
lumines =
J

o
-
ey : speed-distance

time

: a made up unit like miles is speed be its
[]
fortnight [T]
eg : gram meter
[MJCL]-1] so it is speed
-

>

hours kiloy [T] [M] [T]

Significant Figs
- rules : 1) leading O's never sing ey 203 0 . 006
S

*
2) trailing O's not sig ey 70

*
3) trailing J's after decimal always sing ey 1 .
300

Is
4) sandwiched between non-zer nums always sig ey 3006 ,
7032

using sig figs examples
given so <Isigfiy] > Make
- 2 sing figs use scientific notation

ans : 8 0 .
x 10 ↳ -
x1yx
↳ only this part counts as sig ↳ 1) but a

convert 0 . 30026 to scirotation or convert 87osado to scinate

ans : 2 6 . x 10 s als : 8 .
2x10

-
use rounding if you need to decrease sig figs

Prefixes (most common) * memorize

-
deci = 10" - Micr = 13-0 -
nekto = 102 -
giga = 109

- Centi = 10
- 2
-
1916 = 1-9 -
kil = 103

3
106
-

- mili = 10 -
dec = 1 -
meya =

ey x 1) m = < gigameters =
Tym or 2x 10 - 9 g = Inanograms =
Iny

Temperature (most common) memorize

- e F =
[) + 32

- " >
- k = c + 273 . 15

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