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RELEARN METRIC CONVERSIONS!!!! (table not given on tests), READ CH 2
Chem notes 8/26/11
K=deg C+273.15
C= 5/9 (F32)
F= 9/5 C+32
Scientific notation:
All numbers other than 0 are significant
583 has 3 sig figs
zeros in front of nonzero digits are NOT SIGNIFICANT (.00007 had 1 sig fig)
zeros at end of a number and right to decimal are significant.
 zeros between other sig figs are significant
for addition and subtraction, it’s the fewest numbers after the decimal
Dimensional Analysis:

it is on average 96 mil miles from the sun to the earth. With light traveling at
2.99x10^8 m/s, how many mins does it take for light to travel from sun to earth?
(1km=.621 mi) (1mi=1.6093 km)

(96x10^6/1)(1.6093km/ 1 mi)(1000 m/1 km)(1 sec/ 2.99x10^8 m/s)(1 min/ 60
sec)= …….
Isotopes:
Different number neutrons
Average mass= ATOMIC WEIGHT
Question 1:
Lithium has two stable isotopes with masses of 6.01512 u and 7.01600 u. what is the
percent abundance of each isotope respectively.
Percent abundance=(%*amu)+(%*amu)=avg amu
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This note was uploaded on 01/25/2012 for the course CHM 2045 taught by Professor Mitchell during the Fall '07 term at University of Florida.
 Fall '07
 Mitchell

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