Chem test 8/24

Question 1

Dalton

Answer 1

Billiard ball model - indivisible sphere, no internal structure

Question 2

Thompson

Answer 2

Plum pudding Model, Cathode Ray Tube, positive circle embedded with electrons

Question 3

Rutherford

Answer 3

Nuclear Model, Gold Foil, + nucleus with ring of electrons

Question 4

Bohr

Answer 4

Planetary Model, electrons are organized into energy levels

Question 5

Spectrum of People

Answer 5

Electron Cloud Model, electrons based on energy regions, orbitals

Question 6

Cathode Ray Tube

Answer 6

To figure out the charge of an electron: If electrons had a + charge they would move towards the negative plate, etc.
Result: the beam of electrons moved towards the + plate, meaning they have a - charge

Question 7

Oil Drop Experiment

Answer 7

Calculate an electron’s charge using known values, the force of gravity, the mass of drop, and charge of plate.

Question 8

Gold Foil Experiment

Answer 8

Designed to test the plum pudding model: Shot + heavier alpha particles at a thin sheet of gold foil, if none were deflected then plum pudding model would be correct
Result: some were deflected, some paths curved, and some went through. With this information, the Nucleus was discovered

Question 9

Millikan

Answer 9

calculated the charge of an electron, oil drop experiment

Question 10

Lead - 210

Answer 10

on the periodic table, atomic # is 82.
Protons: 82
Neutrons: 210-82=128
Electrons: 82, bc there is no charge so the protons and electrons are equal

Question 11

Alpha

Answer 11

4/2 He

Question 12

Beta

Answer 12

0/-1 e -electron

Question 13

gamma

Answer 13

0/0 &

Question 14

Postiron

Answer 14

0/1 e

Question 15

neutron

Answer 15

1/0 n

Question 16

proton

Answer 16

1/1 P

Question 17

Capture

Answer 17

bombardment and fusion

Question 18

decay

Answer 18

emission fission

Question 19

small

Answer 19

1-20 1:1 if too high beta decay if too low, then electron caption or positron emission

Question 20

meduim

Answer 20

21-82 1.5:1 if too high beta if too low, then electron caption or positron emission

Question 21

large

Answer 21

83-118 always unstable, always alpha decay to fix