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Advanced Higher Chemistry: Unit 1- Inorganic And Physical Chemistry > Electromagnetic Radiation > Flashcards

Electromagnetic Radiation Flashcards

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1
Q

What is electromagnetic radiation composed of?

A

Oscillating electric and magnetic fields.

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2
Q

What is electromagnetic radiation?

A

A form of energy that can interact with atoms and molecules

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3
Q

What does all electromagnetic radiation travel in?

A

Waves at the speed of light

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4
Q

What is the speed of light( number)?

A

3x10’8 ms-1

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5
Q

What is a wave defined by?

A

It’s wavelength and it’s frequency

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6
Q

What is wave length?

A

Distance between adjacent crests

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7
Q

What is frequency?

A

Number of waves that pass a fixed point in one second

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8
Q

What is the wave number?

A

Number of waves per metre

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9
Q

What is the relationship between frequency and wavelength ?

A

Frequency is inversely proportional to wavelength

Short wave length= high frequency
Long wavelength = low frequency

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10
Q

What are photochemical reactions initiated by?

A

Electromagnetic radiation from the visible and ultraviolet region of the spectrum

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11
Q

What is the unit of wavelength?

A

Nanometre

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12
Q

What is the visible region of the spectrum?

A

400-700nm

Blue. Red

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13
Q

What is the ultraviolet range?

A

~200-400nm

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14
Q

What does electromagnetic radiation behave as ?

A

A stream of particles which carry energy - these particles are called photons

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15
Q

What can photons do?

A

Interact with electrons in atoms

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16
Q

What happens when atoms absorb photons?

A

Electrons in the atom gain energy and are now in an excited state

17
Q

What happens when atoms emit photons?

A

They lose energy and return to ground state

18
Q

What is equation given for the energy of a photon?

A

E=hf

19
Q

What is planks constant?

A

6.63x10-34

20
Q

What is the equation given for the energy of one mole of photons ?

A

E= hf x avodgadro’s constant

21
Q

What is the equation for the relationship between wavelength, frequency and velocity ?

A

C= lambda x frequency

22
Q

What are many reactions involving halogens initiated by?

A

Light

23
Q

Describe initiation?

A

Production of the first free radical (always halogen)

24
Q

Describe propagation ?

A

Maintains the supply of free radicals

25
Q

Describe termination?

A

Reaction between 2 free radicals

Advanced Higher Chemistry: Unit 1- Inorganic And Physical Chemistry (12 decks)

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