Chemistry  Chapter 1 2
Terms
undefined, object
copy deck
 unit
 fixed standard of measurement
 precision
 closeness of set of values obtained from identical measurements of a quantity
 accuracy
 closeness of a single measurement to its true value
 significant figures
 those digits in a measured number that include all certain digits plus one final one having some uncertainty
 number of sig figs
 number of digits reported for the value of a measured or calculated quantity; indicating precision of the value
 4 rules of sig fig

1. zeros at beg (left of decimal) aren't sig
2. Terminal zeros (right of decimal) are dig
3. Terminal zeros (left of decimal might be sig  Scientific Notation
 Representation of number in form A x 10^n
 2 rules of sig fig calculation

1. Multiply and divide  answer will have least number of sig figs
2. add subtract  answer will have least number of decimal places  exact number
 number that arises when you count items or when you define a unit
 rounding
 procedure of dropping nonsig digits in a calculation and adjusting the last digit reported
 Rounding rules

1. If digit is 5 or greater drop it and all other to right and add 1 to last digit
2. If digit is less than 5 drop it all digits past it 
SI Base Units
length  meter m
 mass
 kilogram kg
 time
 second s
 temperature
 kelvin K
 amount of substance
 mole mol
 electric current
 ampere A
 Luminous intensity
 candela cd
 10^18

exa
E  10^15

peta
P  10^12

tera
T  10^9

giga
G  10^6

mega
M  10^3

kilo
k  10^2

hecto
h  10

deka
da  10^1

deci
d  10^2

centi
c  10^3

milli
m  10^6

micro
u mu  10^9

nano
n  10^12

pico
p  10^15

femto
f  10^18

atto
a  Formula to convert K and degrees C
 Kelvin equals celcius times 1K over IC and then add 273.15K
 Formula to convert C to F
 celcius equals 5 deg C over 9 deg F times the result of temp in F minus 32 deg F
 SI derived unit
 unit dervived by combining base units
 area

length squared
m^2  volume

length cubed
m^3  density
 d=m/V
 speed

distance traveled per unit of time
m/s  acceleration

speed changed per unit of time
m/s^2  force

mass times acceleration of object
kg x m/s^2 (=newton, N)  pressure

force per unit area
kg/(m * s^2) (=pascal, Pa)  Energy

force times distance traveled
kg * m^2/s^2 (=joule, J)