Exam 1 Flashcards
formula for fahrenheit to celcius
(F-32)/1.8
formula for fahrenheit to kelvin
((f-32)/1.8)+273.15
systematic error
error that is consistently higher or lower than the actual value, cannot be averaged out
random error
error that cannot be predicted, but may be either higher or lower than the expected value. it can be averaged out with repeated trials
exact numbers
accurate counting of objects
defined quantities
integral numbers in an equation
(no uncertainty)
density formula
d=m/V
mega (M)
10^6
kilo (k)
10^3
deci (d)
10^-1
centi (c)
10^-2
milli (m)
10^-3
micro (mu)
10^-6
nano (n)
10^-9
Avogadro’s number
1 mol=6.022x10^23 particles
speed of light (C)
3x10^8 m/s
work
w=Fd
kinetic energy
KE=(mv^2)/2
1 joule is the energy to…
move a 1kg mass at 1 m/s
1 inch is how many cm?
2.54 cm
Law of Definite Proportions
The ratio of elements in a given compound will always stay the same. If it changes, then it is a different compound.
Law of Multiple Proportions
The ratio of the same elements in different compounds will form ratios of small whole numbers.
mass of oxygen to 1g carbon in CO2
———————————————-
mass of oxygen to 1g carbon in CO
2.67/1.33=~2
isotope form of writing elements
A
X
Z
a is the mass number and z is the atomic number
How do you find the weighted average of an element?
Multiply the measured weight by the percentage of natural abundance, then add up them fuckers
Molar mass units
grams per mole
