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CHY1201 - Elements of physical chemistry > Intro to electromagnetic spectrum > Flashcards

Intro to electromagnetic spectrum Flashcards

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1
Q

What is spectroscopy?

A

The study of the interaction between radiation and matter

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2
Q

Larger wavelength …

A

Lower frequency

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3
Q

Smaller wavelength …

A

Higher frequency

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4
Q

What are the 5 waves looked at?

A 
NMR
Microwave 
IR 
UV/Vis 
X-ray
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5
Q

What does NMR involve?

A

Nuclear spin

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6
Q

What do microwaves excite?

A

Molecular rotations

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7
Q

What does IR excite?

A

Molecular vibrations

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8
Q

What does UV/Vis excite?

A

Valence and outer electrons

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9
Q

What does x ray excite?

A

core electrons

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10
Q

What does white light contain?

A

Contains all colours at equal intensity

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11
Q

What colour do you see if you do either emission or absorption?

A

The same colours

As long as the material is the same

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12
Q

What are the two ways spectra can be measured?

A

Absorption or emission

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13
Q

How can most lines in a spectrum be observed in emission?

A

By heating gases of various elements

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14
Q

What are the 5 wave properties of light?

A 
Propagation direction 
Electrical component 
Magnetic field 
Electric field 
Magnetic component
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15
Q

Where is the magnetic component in respect to the electrical component?

A

90 degrees to it

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16
Q

What is the equation for the speed of light?

A

c = wavelength x frequency

17
Q

What are the two types of interference of light?

A

Destructive

Constructive

18
Q

What is destructive interference?

A

The maxima of two waves are 180 degrees out of phase

19
Q

What is constructive interference?

A

The two waves are in phase with each other

20
Q

What is a diffraction grating?

A

Finely grooved surface which can diffract light

21
Q

What does diffraction depend on?

A

Colour of light

22
Q

What happens when an atom moves from higher energy to lower energy?

A

It emits light

23
Q

What is the excited state?

A

Any state of a system with an energy higher than the ground state

24
Q

What is the ground state?

A

The state of a system with the lowest possible energy

25
Q

When is a photon released?

A

Transition from an excited state to a lower state

26
Q

What is the value for planck’s constant?

A

6.63 x 10⁻³⁴ J s

27
Q

What is the value for the speed of light?

A

3 x 10⁸ m s-1

28
Q

What is the equation for wavenumber?

A

ṽ = 1 / λ

CHY1201 - Elements of physical chemistry (28 decks)

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