Chemistry quiz 2

Question 1

Gave the name for atoms.

Answer 1

Democritus

Question 2

Democritus’ models

Answer 2

Different shapes, textures, and size (some are circular and some are spiky circles)

Question 2

Atomic theory

Answer 2

John Dalton

Question 3

Daltons models

Answer 3

Tiny impenetrable, indivisible solid particles (billiard ball)

Question 4

Cathode ray experiment

Answer 4

JJ Thomson

Question 4

Which experiment caused the discovery of electrons?

Answer 4

Cathode ray experiment

Question 5

Thomsons model

Answer 5

Atoms made of electrons flow in positive particles (flashlight)

Question 5

Oil drop experiment

Answer 5

Millikan

Question 5

Millikans model

Answer 5

Oil drops could either fall, stay in the middle, or go up depending on the force attraction.

Question 5

Gold foil experiment

Answer 5

Rutherford

Question 5

Rutherford discovered?

Answer 5

Protons: 1 proton has equal but opposite charge of an electron. Positively charged nucleus.

Question 6

2-8-8

Answer 6

Bohr

Question 6

Rutherfords model

Answer 6

Dense, positively charged nucleus in its center and surrounded by orbiting electrons. (gold foil)

Question 6

Bohrs model

Answer 6

Looks like the solar planet.

Question 7

Bohrs discovery

Answer 7

Electrons orbit at a very specific distance from the nucleus.

Question 7

Wave-particle duality

Answer 7

DeBroglie

Question 9

DeBroglies discovery

Answer 9

All matter oscillates at a specific wave-length. Looks like a wave.

Question 10

Debroglies model

Answer 10

Electrons move along their orbits like a wave (wiggly circle with smaller circle in the middle.

Question 11

Shrodinger

Answer 11

Created an equation to predict the location of any electron in an atom.

Question 12

Shrodingers model

Answer 12

Graphable function telling where electrons have higher probability. (Random bubbles with nucleus)

Question 13

What is a compound, and how is it different from a molecule?

Answer 13

Compounds are made of 2 or more elements, and molecules are made of 2 or more atoms

Question 14

What is the charge of the particles making up the cathode ray?

Answer 14

Negative

Question 15

When Thomson repeated his experiment, what was the independent variable?

Answer 15

The type of metal that the electrodes are made of

Question 16

According to the planetary model, what force is keeping an atom together?

Answer 16

Electrostatic

Question 17

ramp/stair analogy

Answer 17

Ramps are continuous and stairs are discrete

Question 18

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?

Answer 18

It decreases

Question 19

What does Shrodinger’s equation tell us about the movement of electrons?

Answer 19

It tells us the areas around the nuclease that have a high probability of holding an electron