exam 1

Question 1

Chemistry is

Answer 1

the study of the COMPOSITION, STRUCTURE, and PROPERTIES of matter and its CHANGES

Question 2

Hard sphere model

Answer 2

john dalton, atoms like pool balls with hooks

Question 3

Cathode Ray Tube

Answer 3

JJ Thompson, discovered electrons

Question 4

oil drop experiment

Answer 4

harvey fletcher, measured electron charge and size

Question 5

Gold foil experiment

Answer 5

Ernest Rutherford, particles bounced off nucleus, discovered nucleus

Question 6

Plum pudding model

Answer 6

JJ thompson, electrons distributed through atom

Question 7

n

Answer 7

principle quantum number

Question 8

L (special L)

Answer 8

angular momentum quantum number

Question 9

ml (m subscript L)

Answer 9

magnetic quantum number

Question 10

principle quantum number determines

Answer 10

size and energy of an orbital (shell)

Question 11

angular momentum number describes

Answer 11

shape of an orbital (subshell)

Question 12

magnetic quantum number describes

Answer 12

orientation of an orbital

Question 13

total nodes in orbital

Answer 13

(n-1)

Question 14

planar nodes

Answer 14

L (special L)

Question 15

radial nodes

Answer 15

(n-1)-L

Question 16

Pauli Exclusion Principle

Answer 16

only 2
electrons can be placed in each
orbital

Question 17

Aufbau (‘to build”) Principle

Answer 17

electrons are placed in lowest energy orbitals first (lowest n + l )

Question 18

Hund’s Rule

Answer 18

BUS RULE electrons fill all degenerate orbitals singly (and with same spin) before pairing up (it costs energy to put two electrons in the same orbital because they repel each other)

Question 19

diamagnetic field?

Answer 19

Weakly repelled by a magnetic field

Question 20

paramagnetic field?

Answer 20

Attracted by a magnetic field