LC Introduction to Magnetochemistry

Question 1

what is the symbol for magnetic field

Answer 1

H

Question 2

what is magnetic force proportional to

Answer 2

p1*p2/r^2

Question 3

how is magnetic force associated with pole strength

Answer 3

H=1/4pi * p/r^2

Question 4

what is the magnetic constant

Answer 4

mu0 = 4pi x 10^-7

Question 5

what values can quantum number n have

Answer 5

any integer

Question 6

what values can quantum number l have

Answer 6

any integer up to (n-1)

Question 7

what values can quantum number ml have

Answer 7

between l and -l

Question 8

what does the principle quantum number represent

Answer 8

electron energy

Question 9

what does orbital angular momentum quantum number represent

Answer 9

orbital angular momentum of electron

Question 10

magnetic quantum number

Answer 10

allowed orientations

Question 11

what is the formula for magnetic moment

Answer 11

u1=gamma L

Question 12

what is gamma

Answer 12

gyromagnetic ratio

Question 13

what does the gyromagetic ratio account for

Answer 13

charge and mass

Question 14

what is the formula for magnitute of the magnetic moment

Answer 14

|u1| = root(l(l+1)uB)

Question 15

what is a bohr magneton

Answer 15

elementary unit of orbital magnetic moment of an electron

Question 16

what is the formula for spin angular momentum

Answer 16

us = gs gamma s

Question 17

what does S equal in us = gs gamma s

Answer 17

spin angular momentum

Question 18

what is the formula of themagnitude of the spin magnetic moment

Answer 18

|us| =gs root(s(s+1)) uB

Question 19

define magnetisation

Answer 19

total magnetic moment by volume

Question 20

what is the the formula for magnetic induction (B)

Answer 20

B=u0(H+M)

Question 21

what are the SI units of H

Answer 21

Am-1

Question 22

what are the SI units of B

Answer 22

T

Question 23

M

Answer 23

Am-1

Question 24

what is magnetic susceptibility

Answer 24

how responsive a material is to an applied magnetic field

Question 25

what is the formula for magnetic suseptibility

Answer 25

X=M/H

Question 26

what the 2 types magnetic suseptibility

Answer 26

diamagnetic and paramagnetic

Question 27

what is diamagnetism

Answer 27

no unpaired e

Question 28

what effects are caused by diamagnetism

Answer 28

negative susceptablity | responce seen in applied field

Question 29

what is an application of diamagentism

Answer 29

magnetic levitation

Question 30

when does paramagnetism occur

Answer 30

contains unpaired electrons

Question 31

what effects are caused by paramagnetism

Answer 31

random allignment | weak attraction to magnetic field

Question 32

paramagnet vs ideal gas

Answer 32

PV = nRT | HM proportional to T

Question 33

what does curies law show and what is the formula

Answer 33

T dependence of magnetic susceptibility Xm=C/T

Question 34

how can curies constant be determined

Answer 34

1/Xm = T/C C = 1/grad

Question 35

how is effective magnetic moment related to C

Answer 35

ueff = 797.8 root(C) uB

Question 36

what does the brillouin function

Answer 36

plot of M vs. H - plateaus at Msat

Question 37

give some applications of paramagnets

Answer 37

change in entropy upon magnetisation

Question 38

what is spin angular coupling

Answer 38

when orbital and spin angular momentum couple to form total angular momentum (J)

Question 39

what is the effective magnetic moment equal to

Answer 39

ueff = gj root(J(J+1))uB

Question 40

what is the formula for the lande g factor

Answer 40

gj = 3/2 + (S(S+1)-L(L+1)/2J(J+1)

Question 41

what is the effective magnetic moment

Answer 41

total magnetic moment of all unpaired electrons

Question 42

what is the saturated magnetic moment

Answer 42

in very large fields the splitting of energy states is so large that all magnetic moments reside in the lowest energy state

Question 43

what is the formula of usat

Answer 43

usat = gjJuB

Question 44

what is hunds rule

Answer 44

allowed J values = |L+S| .............L+S

Question 45

how to arrange electrons for term symbols

Answer 45

``` maximise S (try not to pair) maximise L ```

Question 46

how to calculate J for term symbols

Answer 46

less than half = |L-S| | more than half = L+S

Question 47

how is the term symbol letter determines

Answer 47

as the letter for L (s,p,d,f,g,h,l)

Question 48

what energy levels does hunds rule account for

Answer 48

ground state only

Question 49

why does hunds rule not work well for 3d

Answer 49

assumes spin orbit coupling is 2nd most important energy - ^oct has greater effect for 3d - L = 0 for 3d

Question 50

why is the spin only formula used for 3d applications of hunds rules

Answer 50

L=0 for 3d

Question 51

what is the spin only formula for ueff

Answer 51

ueff = 2 root(S(S+1))uB

Question 52

what is the spin only formula for usat

Answer 52

usat = 2SuB

Question 53

when does orbital angular momentum occur

Answer 53

when an electron can move to another 90 degrees to its own

Question 54

what are the term symbols for 3d metals

Answer 54

``` T = t2g not full or half full E = eg not full or half full A = t2g or eg full or half full ```

Question 55

what is the relationship between magnetic moment and T

Answer 55

depends on T

Question 56

how are ueff values calcuated for perovskites

Answer 56

root(ueff[A]^2 + ueff[B]^2)