Midterm 1

Question 0

Gamma Rays (y)

Answer 0

wavelength: 10^-11 - 10^-15

Question 1

Blackbody Radiation

Answer 1

Emits light when heated

Absorbs radiation

Question 2

X-rays

Answer 2

wavelength: 10^-9 - 10^-13

Question 3

Ultra-violet

Answer 3

wavelength: 10^-7 - 10^-9

Question 4

Visible Light Wavelengths

Answer 4

Violet 390nm
Blue 450nm
Green 525nm
Yellow 600nm
Orange 650nm
Red 750nm

Question 5

Infrared

Answer 5

wavelength: 10^-3 - 10^-6

Question 6

Microwave

Answer 6

wavelength: 10^-1 - 10^-3

Question 7

Radiowaves

Answer 7

wavelength: 10^4 - 10^2

Question 8

micro (u)

Answer 8

10^-6

Question 9

nano (n)

Answer 9

10^-9

Question 10

Angstrom (Å)

Answer 10

10^-10

Question 11

pico (p)

Answer 11

10^-12

Question 12

Radius of cations

Answer 12

smaller

Question 13

Radius of anions

Answer 13

larger

Question 14

Emission Spectra

Answer 14

v = c(RH) (1/n^2 - 1/n^2)

Question 15

Emission Spectroscopy

Answer 15

Excited sample - slit - prism - lines

change in E: negative

Question 16

Absorption Spectroscopy

Answer 16

light thru sample - slit - prism - spectrum missing lines

change in E: positive

Question 17

Pauli Exclusion Principle

Answer 17

no two electrons can have the same quantum numbers

Question 18

Hund’s Rule

Answer 18

electrons occupy degenerate orbitals singularly but in the same spin state

Question 19

Aufau Process

Answer 19

fill to minimize energy

1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p 6s

Question 20

Exceptions filling orbitals

Answer 20

Cr [Ar] 3d^5 4s^1

Cu [Ar] 3d^10 4s^1

Question 21

Radial Distribution Function (RDF)

Answer 21

Probability of finding an electron at distance r

RDF = 4(pi)r^2(workfunction)^2

Question 22

Standing Wave Equation

Answer 22

L = n(wavelength/2)
n = nodes + 1

Question 23

Energy in a wave is

Answer 23

proportional to the amplitude

Question 24

KE in the photoelectric effect

Answer 24

increases with frequency (once past v0)

Question 25

of electrons during the photoelectric effect depends on

Answer 25

Intensity

Question 26

Ionization Energy

Answer 26

Energy needed to strip away an electron
Always +
Harder in upper right
Exception: Al < Mg since it is easier to pull electrons from higher energy orbitals

Question 27

Electron Affinity (sometimes Electronegativity)

Answer 27

Energy change when an electron is added
Often negative (exothermic)
Easiest in upper right (most negative) - does not include nobel gases
It is positive when added electron to negative ion

Question 28

_ J = 1eV

Answer 28

1.602E-19J

Question 29

mega (M)

Answer 29

10^6

Question 30

Giga (G)

Answer 30

10^9

Question 31

Tera (T)

Answer 31

10^12

Question 32

Exceptions Electron Affinity

Answer 32

Si, P, S and Cl have more negative electron affinities than C, N, O and F