Chem Unit 3

Question 1

Coloumb’s Law

Answer 1

like chargers repel/opp. charges attract proportionaly to the product of the charges and inv proporp. to the distance between the two

Question 2

shell

Answer 2

energy level, “3”p3

Question 3

sublevel

Answer 3

spdf

Question 4

core elec.

Answer 4

elec. that r not in valence shell, 1s2 2s2 2p4; 1s2 is core elec.

Question 5

valence elec

Answer 5

elec. in outermost shell; in [Ar]4s2 3d4, 4s2 is valence

Question 6

Hund’s rule

Answer 6

oppsites repel; elec. orbitals will be singularly occupied before doubly occupited

Question 7

Aufbau principle

Answer 7

electrons fill from bottom up

Question 8

isoelectronic

Answer 8

same e- config.

Question 9

ionization energy

Answer 9

eng. required to remove e- from isolated atom/molec. in gas phase

Question 10

electron affinity

Answer 10

eng. change in neutral atom when e- is added (chance of gaining an e-) (more neg. -> higher)

Question 11

electronegativity

Answer 11

prop. that increases w/ tendency to attract e- (how much it attracts e-
s)

Question 12

Dalton

Answer 12

small sphere w/ no charge

Question 13

JJ Thompson

Answer 13

plum pudding (+ body with - e- soread apart); cathode ray

Question 14

Rutherford

Answer 14

+, hard, dense; gold foil

Question 15

c=

Answer 15

lambda nu, c= 3* 10^8m/s

Question 16

e=

Answer 16

h nu; h = 6.626210^-34 Js

Question 17

double slit

Answer 17

shie light through w slits; can see that does prop. of a wave (constructive, destructive interference); light has prop. of wave

Question 18

energy is quantized

Answer 18

in steps; on 1 or 2, nothing in b/w

Question 19

line spectrum

Answer 19

elec. goes from excited to ground -> energy is released as photons of light -> seen in light spectrum. Eng is quantized + diff wavelengths of light coresspond to distacne b/w ground and excited state

Question 20

photoelectric effect

Answer 20

if pass threshold eng, e- has enough eng to the point where it leaves the atom; more eng -> more eng for emitted e-.

Question 21

UPS/PES

Answer 21

gives relative location of e-, evidence that orbitals r quantized (e- exist only at certain eng. levels)

Question 21

UPS/PES

Answer 21

gives relative location of e-, evidence that orbitals r quantized (e- exist only at certain eng. levels)

Question 22

poly exclusion principle

Answer 22

orbital has max of 2e- with opposite spins

Question 23

prob. w/ bohr model

Answer 23

only work with H, e- not in circular orbits

Question 24

orbital

Answer 24

location where ur most likely to find e-

Question 25

photoelectric effect

Answer 25

e- are emmited from an atom when eng strikes it, under the conditional that the eng is above the mininum threshold engergy. If the energy is below the treshold, nothing is emitted.