Chemistry 1.5 Emission and absorption spectra

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  • Created by: Dan
  • Created on: 28-12-13 12:04
What is light?
A form of electromagnetic radiation
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How do you work out the speed of light?
Frequency (Times) Wavelength
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How do you work out energy?
Planck's Constant (Times) Frequency
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What does this show?
Frequency is directly proportional to Energy
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And?
Frequency is inversely proportional to Wavelength
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The lower the wavelength...
The higher the frequency and greater the energy
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Explain how the absorption spectrum works
Light is absorbed by atoms photons. The photons absorb the light as energy. This energy causes electrons to increase in energy levels and thus become excited
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How does the electron become more excited as it increases energy levels?
As the electrons increase energy levels they move further away from the nucleus, reducing nuclei pull
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Explain how the emission spectrum works
when atoms are given energy their electrons increase in energy levels. When this energy is removed the electrons fall back to a lower energy level, and energy is lost as a packet. The packets of energy lost are shown as small bursts
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What is another term for a specific amount of energy?
We say the energy is 'quantised'
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How do we measure the light spectrum?
Using a spectrometre
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Other cards in this set

Card 2

Front

How do you work out the speed of light?

Back

Frequency (Times) Wavelength

Card 3

Front

How do you work out energy?

Back

Preview of the front of card 3

Card 4

Front

What does this show?

Back

Preview of the front of card 4

Card 5

Front

And?

Back

Preview of the front of card 5
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