chem. chapter 2
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length
meter
m
mass
kilogram
kg
time
seconds
s
thermodynamic temperature
kelvin
K
amount of substance
mole
mol
metric system
system instrumental
velocity (speed)
length/time
area
l x l
volume
area x length
density
mass per unit volume
density is measured in....
g/vol.
g/cm3
g/mL
dm3=...
1L=1000dm3=1000mL
density of water at 25 degrees C=
1.00 g/cm3
4 rules of significant digits
digits other than 0 are always significant
1 or more final 0s used agter the dec are alwats significant
0s between 2 other significant digits are significant
0s used solely for spacing the sec are not significant
significant digits rule in chemistry
every math prob will have an answer in 3 significant digits
when a number has five or more places....
use scientific notation
accuracy
how close a measurement is to its actual exact value
precision
how close a set of measurements are to each other
% error
copoares your experimental value to a known value
% error equation
|your value-known value|/known value x 100
qualitive measures
when you describe an object without using meausrements
quantitive measures
when you sescribe an object using measurements
temperature
the measurements of the average kinetic energy of particles in an object
the higher the kinetic energy, the higher the temp.
heating
the process in which kinetic energy is in increased
Card Set Information
Author:
mnmitch
ID:
34887
Filename:
chem. chapter 2
Updated:
2010-09-15 12:39:19
Tags:
chemistry
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Description:
chapter 2
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