PRE-AP CHEM TEST*
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- Who used the atomic theory to explain the law of definite proportions?
- John Dalton
- What in the law of definite proportions? And who came up with it?
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The ratios of one element to another are always the same in a given chemical compound.
Joseph Proust - Experimented w/ cathode rays discovered electron was the first known particle that is smaller than an atom.
- J.J Thomason
- (Raisin-pudding model) A sphere of positive charge is embedded with electrons.
- J.J Thomason
- Stated that substances can emit light only at certain energies or specified amounts of called quantrums.
- Max Planck
- Presented theory of the atom, consisting of a positively charged nucleus surrounded by negative electrons.
- Ernest Rutherford
- Who had the Gold Foil Experiment?
- Ernest Marsden
- Model for the hydrogen atom in which the electron orbits the nucleus and absorbs energy by jumping to a higher orbit.
- Neil Bohr
- OIL DROP EXPERIMENT , A SEVEN YEAR STUDY
- Robert Andrews Millikan
- Discovered the proton in 1914
- Ernest Rutherford
- Proposed the existence of the neutron.
- William Draper Harkins
- U 235/92 What is the atomic mass? AKA # or neutrons!!!!
- 235
- U 235/92 How many protons?
- 92
- What two parts of Dalton's theory was wrong?
- Indivisible/all atoms of an element are the same.
- two istopes same ......
- protons...neutrons
- What is another name for 6.022*10^23
- Amedeo Aragadro's #
- Same # of protons and different # of neutrons
- KNOW ISOTOPE
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KNOW DALTONS ATOMIC THEORY
*Indivisible
*cannot be created or destroyed*all matter made of atoms,/same element identical compounds - KNOW JAMES CHADWICK
- TWO PARTS OF ATOM CONTRIBUTE TO ATOMIC MASS?
- PROTONS AND NEUTRONS
- Cathode rays led to discovery of proton
- E GOLDSTEIN