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Equations and Theories
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35
Chemistry
10th Grade
10/20/2010

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Term
law conservation of mass
Definition
total of mass and energy stay the same in any charge
Term
law of multiple proportions
Definition
when different compounds are formed by using the same elements, different masses combine in a particular whole number ratio.
Term
dalton's atomic theory
Definition
atoms are made of indivisible particles
chemical reactions involve rearrangements of atoms
atoms of diff. elements combine to form compounds
Term
aristole known for ?
Definition
all substance is made of 4 elemnts,
water earth fire wind
Term
atom
Definition
smallest particle of an ELEMENT
Term
who made cathode ray tube?
what does tube do?
what is he known for ?
Definition
J.J thompson
air is pumped out
plum pudding model, discovered electrons
Term
Ernest Rutherford
Definition
discovered postitive piece in center, nucleus
electrons would surround it
atom is empty
Term
neutron is same mass as ... ?
Definition
proton
Term
alpha particle
Definition
positively charged pieces
shot at florescent screen it glows
deflected by positive pieces.
Term
nucleus in weight.
Definition
small volume, big mass and density
Term
the atomic number says
Definition
the number of protons
Term
mass number is...
Definition
protons +neutrons
account for most of mass
Term
isotope
Definition
atoms of same element can have diff number of NEUTRONS
CHANGES mass number
Term
how to get average
Definition
multiply atomic mass number (isotope) by percentage abundance then add them together
Term
study of light led to
Definition
quantum mechanical model
Term
speed of light
Definition
3.00 x 10^8 m/s
Term
v =
Definition
frequency
Term
lambda =
Definition
wavelength
Term
frequency is expressed in what units
Definition
seconds or hertz
Term
equation for frequency
Definition
speed of light=wavelength(frequency)
Term
emission spectra or photoemission
Definition
when light is given off by electron falling from high energy level to low energy level.
Term
metric unit of energy ?
Definition
Joules
Term
equation to find wavelength
Definition
frequency = wavelength (speed of light)
Term
equation to find energy of photon
Definition
E=planks constant (frequency)
Term
model that only had hydrogens
Definition
bohrs model
Term
equation to find wavelength of a particle
Definition
lambda = planks constant / mass(frequency)
Term
Heisenburg uncertainty principle
Definition
it is impossible to know exactly the location and velocity of a particle.
Term
bohrs model
Definition
Planetery model
amount of energy sperate one level from another
move around like planets
Term
what is quanta
Definition
quna is the amount of energy needed to move energy levels
Term
principle quantum number
Definition
energy level
1,2,3
Term
atomic orbital
Definition
like electron cloud
where you would find electron
Term
sublevels
Definition
s,p,d,f
Term
aufbau principle
Definition
electrons enter the lowest energy first
Term
Pauli exclusion principle
Definition
at most 1 electron per orbital- different spins
Term
hunds rule
Definition
when electrons occupy orbitals they cannot pair up until they have to
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