Elements Of Life: Spectroscopy Flashcards

1
Q

What is the order of the EM spectrum with increasing frequency?

A

Radio, Micro, IR, Light, UV, X, Gamma

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2
Q

What is the order of the EM spectrum with increasing wavelength?

A

Gamma, X, UV, Light, IR, Micro, Radio

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3
Q

What is the order of the EM spectrum with increasing energy?

A

Radio, Micro, IR, Light, UV, X, Gamma

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4
Q

Which EM wave has the longest wavelength

A

Radio

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5
Q

Which EM wave has the shortest wavelength

A

Gamma

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6
Q

Which EM wave has the highest frequency

A

Gamma

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7
Q

Which EM wave has the lowest frequency

A

Radio

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8
Q

Which EM wave has the highest energy

A

Gamma

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9
Q

Which EM wave has the lowest energy

A

Radio

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10
Q

Definition of quantisation

A

Specific energy value

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11
Q

Name 2 types of spectra

A

Absorption

Emission

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12
Q

What does energy absorbed by an electron do

A

Causes electrons to be excited = promote ( jump ) to higher energy levels

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13
Q

When electrons are excited state what does this result in

A

(Atom) = unstable

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14
Q

When electrons are in excited states ( unstable ) what do they do

A

Electrons drop back down = emitting photo ( light )

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15
Q

What does energy levels being quantised ( having a specific energy value ) result in

A

Lines of specific frequencies / wavelengths

E = hv

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16
Q

List similarities between the 2 types of spectra (2)

A
  1. Lines in both = closer together at high frequencies
  2. Both are LINE spectra
    • E=hv
    • lines of specific frequencies
17
Q

List differences between the 2 spectra

A
  1. Absorption = coloured back ground - Emission = black background
18
Q

What do energy absorbed and energy emitted always have to be

A

The exact same

Energy absorbed = energy emitted

19
Q

What is the 6 marker answer need to learn for line spectra questions

A
  1. Energy absorbed causes electrons to be excited
  2. = promotion ( jump ) to higher energy levels
  3. Excited states = unstable = electrons drop back down emoting photon ( light )
  4. Energy levels = quantised ( specific energy value )
  5. = lines of specific frequencies / wavelengths
  6. E = hv
  7. Draw diagrams
20
Q

Equation for c, speed of light

A

c=v lamda

Speed of light = frequency x wavelength ( m )

21
Q

1st equation for E, energy ( J )

A

E=hv

Energy = planks constant x frequency

22
Q

2nd equation for E, energy ( J ) when only given the wavelength

A

E= hc/ lamda

Energy (J) = ( planks constant x speed of light ) / wavelength

23
Q

How to go from J -> KJmol^-1

A

Divide by 1000
Then…
Multiply by Avogadros constant

24
Q

How to go from KJmol^-1 -> J

A

Divide by Avogadros constant
Then….
Multiply by 1000

25
What does ‘c’ stand for
Speed of light
26
What does ‘h’ stand for
Planks constant
27
Describe emission spectra
1. Coloured lines on black background 2. Lines = specific to an element 3. Because energy gaps = unique 4. Compare with known data
28
How lines used to identify elements
1. Each element = own specific energy level 2. = Different energy gaps 3. = Different frequency lines 4. Compare frequencies of lines with known data
29
How lines formed + why they have specific frequencies
1. Atoms absorb energy 2. Electrons promote to higher energy level 3. Atom = unstable = electrons drop back down emitting light 4. E=hv ( energy dropped = proportional to frequency )