unit 1 Flashcards
includes all unit 1 power points and study guide information. also all practice problems (not math)
use substance and element in a sentence that describes relation
an element is a pure substance. the other pure substance is a compound.
use substnace and mixture in a sentence that describes relation
a mixture is composed of 1 or more pure substances combined in variable proportions
is it easier to prove an unknown substance an element or compound
compound
mixtures are classified by their
properties
classification of seawater
mixture
4 properties of metals
malleable
ductile
lustrous
good conductors
4 properties of nonmetals
poor conductors
brittle as solids
dull
gases at room temp
1 chemical property of metals
oxides react with water to form hydroxides
1 chemical property of nonmetals
oxides react with water to form acids
is CO2 organic or inorganic
inorganic
is H3PO4 molecular or ionic
molecular
rf=
distance spot moved/distance solvent moved
difference in ideas of atom development between democritus and dalton
democritus: no experimental evidence to support idea
dalton: had experimental evidence
what evidence led thompson to determine that cathode ray was beam of negative particles
attracted to positive CRT
repelled by negative cathode
why did rutherford conclude that nucleus has a positive charge
alpha particles have a positive charge. a few deflected off gold foil, Rutherford concluded deflected thing had a positive charge
problems with rutherfordś model
e- should lose energy and be pulled into nucleus
atom should collapse
electrons are acellerating charges
why was planckś theory not accepted at first
behavior of waves and particles are seen differently and supported by experiments and math
E=
hv
h(c/lamda)
h=planck’s number
v=frequency
c=speed of light
lamda=wavelength
h (planck’s number)
6.626 x 10^-34 J x s^-1
6 types of radiation in order of lowest to highest eneergy
infared
red
blue-green
blue
violet
uv
contrast Bohr and debroglie electrons
bohr: fixed energy levels, didnt know why they existed
debroglie: theoretical foundation for fixed energy levels that involved looking at wave properties of particles
how did Heisenberg and Schrodinger see electron differently
Heisenberg: complex equations, particle w quantum behavior
Schrodinger: mathematics, wave phenomenon
contrast borh’s energy level and quantum mechanical model
bohr: e- follow fixed paths around nucleus
qmeo: quantized energy, impossible to find electrons, e- found in atomic orbital, shows probability of finding an electron
n shows
principal quantum number
size
energy levels