from revision so far

Question 1

visible light wavelength range

Answer 1

400nm
700nm

Question 2

what colour has a visible light wavelength of 400nm

Answer 2

blue

Question 3

what colour has a visible light wavelength of 700nm

Answer 3

red

Question 4

how do u turn nm into m

Answer 4

x 10^-9

/1000 then /1000 then /1000

Question 5

units of wavelength

Answer 5

nm
cm
m

Question 6

units for speed of light

Answer 6

nm s-1
cm s-1
m s-1

Question 7

frequency, v units

Answer 7

s-1

Question 8

frequency definition

Answer 8

number of wavelengths per second

Question 9

energy of one photon in J

Answer 9

E=hv

Question 10

units of h planks constant

Answer 10

Js

6.626x10^-34

Question 11

what is spec the study of

Answer 11

light and matter

Question 12

absorption spec

Answer 12

e- absorbing certain photons of light and transitioning to a higher energy level

Question 13

emission spec

Answer 13

e- releasing specific photons of light and returning to ground level

Question 14

stimulated emission spec

Answer 14

incident ray is applied onto an e- in order for it to release photons and transition to lower energy levels

incident ray energy = transition energy = energy of emission

Question 15

wavelength
frequency
speed of light

Answer 15

c = v /\

Question 16

energy of 1 photon
planks
frequency

Answer 16

E=hv

Question 17

wavenumber

Answer 17

1/ /\

cm-1 m-1 nm-1

bc its 1/ wavelength units

Question 18

E = hc wavenumber (1//)

Answer 18

energy in J

Question 19

if a question relates ev into cm-1 what is it relating it to

Answer 19

wavenumber
bc its 1//\ units (cm, m etc)

u would use wavenumber as the energy

Question 20

photoelectron spec

Answer 20

energy is used to remove an e- from an e- pair.

the energy can be found:
hv= IE + Ke

ionisation energy + kinetic energy

Question 21

absorbance is

Answer 21

log(transmittance)

Question 22

transmittance is

Answer 22

i / i0

Question 23

% transmittance is

Answer 23

I / i0 x100

Question 24

beer Lambert equation

Answer 24

A = E c l

a = abs
E = molar extinction coefficient (mol-1dm3 cm-1)
c= conc (moldm-3)
l = length of curvette (cm)

Question 25

beer Lambert plotting A against c

Answer 25

gradient = E

small conc: signal intensity is too low and noise is higher

larger conc: molecules interact too much with eachother + affects absorbance

Question 26

steps for wt%

Answer 26

find conc

conc = moles in 100cm3

conc x rmm = mass of drug in 1000cm3

find mass of drug in x cm3 (use ratio)

divide mass in x cm3 with the mass of sample (tablet etc)