chemistry unit 3 tes chemistry test

January 18, 2018 Off By admin
Question Answer
when did democritus form his theory 460-870 BCE
what term did democritus term "atomos"
what does atomos mean indivisible
what was democritus's theory everything is made of tiny particles that vary in shape and size and are surrounded by empty space
when did aristotle form his theory 330 BCE
what was aristotle's theory matter is made of 4 elements- earth, water, fire, air
when did john dalton form his theory 1808
what 4 things did john dalton discover about atoms 1. matter can be broken down into proportions
2. atoms of elements are identical
3. matter can't be created or destroyed
4. atoms of the same element have the same mass
what was dalton's breakthrough atomic theory was accepted
what experiment discovered the electron cathode ray
what happens when magnets are brought toward a stream of electrons particle stream is bent towards the positive end of the magnet
what did the cathode ray experiment conclude electrons are negative
when did jj thompson form his theory 1897
what was jj thompson's model plum pudding model
what did the plum pudding model show negatively charged electrons in a positive mass
when did rutherford form his theory 1910
what was the gold foil experiment shot large alpha (positive) particles at gold foil and discovered that the nucleus is small and dense
who did the gold foil experiment rutherford
what do the electrons orbit nucleus
what is the atom mostly empty space
what was rutherford's model called planetary
when did bohr form his theory 1913
what was bohr's model called bohr planetary
what was bohr's theory each orbital has a specific level
when did heisenberg and schrodinger form their theory 1920
what was heisenberg and schrodinger's model called quantum mechanics (uncertainty principle)
we cannot know the exact location of electrons, only an…… approximate location
what does each electron orbital have different suborbital
where are the protons/ neutrons located nucleus
where are the electrons located outside the nucleus
what is the top part of the periodic table element block atomic #
what is under the element symbol element name
what is under the element name atomic mass
what does the atomic # represent electrons/ protons
what does the atomic mass represent protons and neutrons
where does most of the mass come from nucleus
how would you figure out the number of neutrons in an atom atomic mass – atomic #
how many electrons can each level hold first-2
what are the electrons in the outermost shell called valence
what determines the name of the atom # of protons
what is an isotope atoms with a same number of protons but different number of neutrons
in large atoms the number of protons is _______ than the number of neutrons less
how to write in isotope notation write the atomic symbol with the atomic mass on top and atomic # on bottom
what is the formula for atomic mass (% isotope times mass of isotope) + (% isotope times mass of other isotope)
spontaneous emission of rays or particles from certain elements radioactivity
rays and particles emitted from a radioactive source nuclear radiation
unstable isotopes that begin nuclear reactions radioisotopes
when do isotopes become stable changes in nuclei with emission of large amounts of energy
alpha 4/2 He
beta 0/ -1 e
gamma 0/0 upside down fish
what does alpha consist of helium
what does beta consist of an electron
what does gamma consist of high energy electromagnetic radiation
what is the alpha charge 2+
what is the beta charge 1-
what is the gamma charge none
what is the alpha mass 4 amu
what is the beta mass 1/1837 amu
what is the gamma mass none
what is alpha's penetrating power low (stopped by paper)
what is beta's penetrating power moderate (pass through skin)
what is gamma's penetrating power high (go cm through concrete/ lead)
what is the damage from alpha low, can burn you
what is the damage from beta tissue/ organ damage
what is the damage from gamma dead
what is half life amount of time it takes for half of a radioactive
what is fission splitting of a nucleus to form fragments and a nucleus with energy
what is fusion the combining of smaller nuclei to form a large nucleus with a greater mass
where does fission occur nuclear power plant with radioactive elements
where does fusion occur the sun (stars), hydrogen bomb, extreme pressure/ temp
how can fission be used nuclear energy
how can fusion be used bombs (not usable yet)
what are fission waste concerns biohazard, radioactive, toxic
what are fusion waste concerns no waste but explosions that can't be controlled
what is the feasibility of fission use easy to use
what is the feasibility of fusion use not yet feasible
how much energy does fission release large
how much energy does fusion release way more than fission
what type of atoms does fission occur with heavy (uranium)
what type of atoms does fusion occur with light (hydrogen)
does fission occur naturally or can it be initiated both
does fusion occur naturally or can it be initiated both (mainly naturally)
what are examples of fission uranium, nuclear power plants
what are examples of fusion sun/ H bomb
what does e=mc2 mean energy= mass times the speed of light squared
what are protons, neutrons, and electrons subatomic particles
what is gamma radiation that emits energy photons
what is the difference between rutherford and bohr planetary model rutherford has electrons randomly orbit the nucleus
bohr has electrons in orbital shells
what are the 3 half life equations 1. # of half lives= time elapsed/ half life
2. amount remaining= starting amount (.5)^# of half lives
3. half life = t (log 2)/ log (sa/ar)
why did we change from model 1 to model 2 cathode ray (discovery of the electron)
why did we change from model 2 to model 3 gold foil experiment
why did we change from model 3 to model 4 electrons orbit in energy shells
why did we change from model 4 to model 5 each orbit has a different shape and we don't know exact locations of electrons
what is alpha blocked by paper
what is beta blocked by wood/ aluminum
what is gamma blocked by lead/ concrete
what type of reactions does fission involve chain