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30 Cards in this Set
- Front
- Back
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what is a Mole |
A unit for counting atoms/Molecules |
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What are cathode rays? |
Particles that have mass |
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what is avegrado's number? |
6.02x10^23 |
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What is a crookes tube? |
A tube where cathodes are light inside and are different colors based on what element it is being reflected off of it |
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What are the known properties of cathode rays |
Magnetic, negative, mass |
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why are they called cathode rays |
because they are always called cathode rays |
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Who discovered the electron? |
Thomson |
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What does the plum pudding model mean? |
Plum - electrons pudding - positive matrix |
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Why the positive matrix |
Thomson needed something positive to cancel out the negative electrons |
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What was the problem with the plum pudding? |
They didn't know what the positive matrix was made of |
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where are the electrons in plum pudding? |
Scattered randomly throughout the positive matrix |
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Who discovered radioactivity? |
Bequerel |
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What are the three types of radioactivity? |
alpha decay, beta decay, positron emission |
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who worked with rutherford |
Marsden & Geiger |
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What did rutherford discover? |
The nucleus |
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what experiment did rutherford do? |
They wrapped a sensor around the gold leaf, and shot alpha particles at gold leaf |
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what was rutherfords model for the atom? |
Nuclear atom |
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Where are the electrons in the nuclear atom |
Orbiting around the nucleus |
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What is the problem with the nuclear atom? |
Why aren't the electrons crashing into the nucleus? |
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What is quantum? |
small packet of energy |
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what is bohrs model for the atom |
Bohr's Atom |
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Where are the electrons in bohr's atom? |
Orbiting the nucleus |
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Problems with Bohr's Atom |
Only works for hydrogen atom |
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What did Moseley study |
X-Rays |
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what is the heaviest part in the nucleus? |
The proton |
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what old problem did the discovery of the nucleus solve? |
Order of elements in the table of elements |
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how did debroglie change Bohr's model? |
energy levels became orbits. |
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What is special about integers in the hydrogen spectrum? |
The number of orbits the electrons jump |
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What is different about Planck's description of light compared to previous descriptions of light? |
Originally, light was a wave. Planck says light is a quantum |
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What does the amplitude in the light wave mean? |
Brightness |
