Module 3

Question 1

What three variables determine the nature of light.

Answer 1

Amplitude
Wavelength
Frequency

Question 2

Amplitude

Answer 2

Power of light. Determines brightness or intensity of light

Question 3

Wavelength

Answer 3

Measure of successive crest points(wave maxima) measured in nm

Question 4

Frequency

Answer 4

Measured in unites of Hertz. Number of successive waves to pass a point in 1 second

Question 5

400nm

Answer 5

Low wavelength, high frequency

Question 6

800nm

Answer 6

high wavelength, low frequency

Question 7

How do microwaves interact with matter

Answer 7

They cause molecules to rotate

Question 8

How does infrared interact with matter

Answer 8

Causes molecules to vibrate

Question 9

How does Ultraviolet interact with matter

Answer 9

Causes molecular bonds to break (Hence the need for sunscreen)

Question 10

What are photons

Answer 10

Photons are discrete, quantised packages of light

Question 11

h*c =

Answer 11

1.98*10^-25J.m

Question 12

Relationship between wavelength and energy

Answer 12

Inversely proportional

Question 13

Drawbacks of Bohr’s model

Answer 13

The calculations only work for 1e- Species(H-atom, B4+)
Calculations do not help predict the complicated spectra of multi-electron species
No mathematical reason for using whole integers i.e. (1,2,3 etc)
Electrons do not orbit the nucleus like planets around the sun

Question 14

wave-particle duality

Answer 14

Describes the wavelike properties of subatomic particles.

Question 15

de Broglie Relation

Answer 15

wavelength = h/m*v = h/momentum

Question 16

Total number of nodes

Answer 16

n-1

Question 17

Angular momentum(l)

Answer 17

Number of angular nodes

Question 18

Radial nodes

Answer 18

Radial = n-1-l

Question 19

Pauli exclusion principle

Answer 19

No two electrons can have the same orientation

Question 20

Valence Electrons

Answer 20

Outermost electrons, responsible for bonding

Question 21

Electron configuration

Answer 21

Process of placing electrons into their appropriate energy orbital following a set of “rules”

Question 22

Aufbau

Answer 22

Fill electron into orbitals from the lowest energy to highest

Question 23

Hunds Rule

Answer 23

When degenerate orbitals are available; electrons occupy these orbitals, singly and parallel(Same spin) until they must pair with an orbital

Question 24

degenerate

Answer 24

Two or more orbitals with the same value of l (same subshell)

Question 25

Isoelectronic

Answer 25

Elements with the same num of total e- & same electron configuration

Question 26

What does Zeff affect?

Answer 26

Atomic radius