Chm 139 Book notes
Chapter 1
•
Periodic table
:
periods
are 7 horizontal rows,
groups
are 18 vertical columns. Elements
in groups have similar chemical properties.
•
Properties
:
intensive
 does not depend on size of the sample eg. Melting pt or temp.
extensive
 does depend on size of sample eg. Volume, length
•
SI units
:
mega
10^6m
giga
10^9m.
micro
10^6
nano
10^9 s
pico
10^12s
•
Mass:
measures the amt. of matter in an object
.
•
Weight:
measures the pull of gravity on an object by the earth.
•
0 K (Kelvin absolute zero) = 
273.15 degrees Celcius and is the coldest possible temp.
•
273.15K
= 0degrees Celsius.
•
To get Temp in K
= degrees + 273.15…to get temp in degrees= K273.15
•
Celsius(C) to Fahrenheit
: Tf= (9F/5C * C) +32F…
Fahrenheit to Celsius
: C= (5C/9F)
x (degree
F32F)
•
Density:
the mass of an object divided by its volume
Density=mass (g) /vol (ml or
cm^3)
•
accuracy
how close to the true value a given measurement is.
•
Precision
how well a number of independent measurements agree with each other.
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 Fall '08
 BROWNING
 Chemistry, Atom, Atomic Number, Chemical element, coldest possible temp

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