Chemistry quiz 2 Flashcards
Gave the name for atoms.
Democritus
Democritus’ models
Different shapes, textures, and size (some are circular and some are spiky circles)
Atomic theory
John Dalton
Daltons models
Tiny impenetrable, indivisible solid particles (billiard ball)
Cathode ray experiment
JJ Thomson
Which experiment caused the discovery of electrons?
Cathode ray experiment
Thomsons model
Atoms made of electrons flow in positive particles (flashlight)
Oil drop experiment
Millikan
Millikans model
Oil drops could either fall, stay in the middle, or go up depending on the force attraction.
Gold foil experiment
Rutherford
Rutherford discovered?
Protons: 1 proton has equal but opposite charge of an electron. Positively charged nucleus.
2-8-8
Bohr
Rutherfords model
Dense, positively charged nucleus in its center and surrounded by orbiting electrons. (gold foil)
Bohrs model
Looks like the solar planet.
Bohrs discovery
Electrons orbit at a very specific distance from the nucleus.
Wave-particle duality
DeBroglie
DeBroglies discovery
All matter oscillates at a specific wave-length. Looks like a wave.
Debroglies model
Electrons move along their orbits like a wave (wiggly circle with smaller circle in the middle.
Shrodinger
Created an equation to predict the location of any electron in an atom.
Shrodingers model
Graphable function telling where electrons have higher probability. (Random bubbles with nucleus)
What is a compound, and how is it different from a molecule?
Compounds are made of 2 or more elements, and molecules are made of 2 or more atoms
What is the charge of the particles making up the cathode ray?
Negative
When Thomson repeated his experiment, what was the independent variable?
The type of metal that the electrodes are made of
According to the planetary model, what force is keeping an atom together?
Electrostatic
ramp/stair analogy
Ramps are continuous and stairs are discrete
Looking at the equation for DeBroglie’s wavelength, if “h” and “v” stay the same, but “m” increases, what will happen to the size of the wavelength?
It decreases
What does Shrodinger’s equation tell us about the movement of electrons?
It tells us the areas around the nuclease that have a high probability of holding an electron
