chemical ideas 6.7 where does colour come from?. 25 questions to see what you’ve remembered
Post on 21-Dec-2015
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![Page 1: Chemical Ideas 6.7 Where does colour come from?. 25 questions to see what you’ve remembered](https://reader036.vdocuments.site/reader036/viewer/2022062407/56649d595503460f94a39727/html5/thumbnails/1.jpg)
Chemical Ideas 6.7
Where does colour come from?
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25 questions to see what you’ve
remembered.
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More about the colour we see .. Key stage 3 stuff.
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1. What colour is the light reaching my eye? Explain.
Red filter
transmit absorb reflect
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2. What colour is the light reaching my eye? Explain.
Blue filter
transmit absorb reflect
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3. What colour is the light reaching my eye? Explain.
Colourless glass
transmit absorb reflect
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4. What colour does the ball
look? Explain.
transmit absorb reflect
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5. What colour does the ball
look? Explain.
transmit absorb reflect
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6. What colour does the ball
look? Explain.
transmit absorb reflect
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7. What colour does the ball look? Explain
transmit absorb reflect
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8. What colour does the ball
look? Explain.
transmit absorb reflect
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9. The rays are …
•A. Refracted
•B. Reflected
•C. Dispersed
•D. Converged
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10. Name the 3 primary colours of light …
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Chemical Ideas 6.1
Light and the electron.
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Sometimes we use the wave model for light …
• λ (lambda)= wavelength
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11. Wavelength increases, Frequency ?
C
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•12. Sketch the e.m.s. and use arrows to
mark:
•Increasing energy•Increasing wavelength•Increasing frequency
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C = λν problems….
Work out v:
13. If λ is 3.00 m
14 If λ is 30.0 cm
15. If λ is 3.00 mm
Work out λ:
16. If ν is 3.00 x 1010 Hz
c = 3.00x108 m s-1
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Sometimes we use the particle model …hE
• Packages of energy are called photons
• Light is a stream of photons
• E = 6.63 x10-34 x 4.5 x 1014 = 3.0 x 10-19 J
14105.4 x Hz
h = 6.63 x 10-34 J Hz -1
Planck constant
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E = hν problems …
• h = 6.63 x 10-34 J Hz -1
• Planck constant
17. If the frequency is 1.089 x 106 Hz, what is the energy of each photon?
18. If E = 3.65 x 10-20 J per photon, what is the frequency (ν) of the radiation?
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19. Absorption or emission Spectrum of hydrogen?
• Black background
• Coloured lines.
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Spectroscopy• Sample of
hydrogen
• High voltage
• Prism
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• Electrons can only exist in fixed energy levels.
ΔE
h
E
• Electrons absorb energy and move to a higher energy level.
• The electrons drop back to a lower energy level and emit energy.
• The frequency of the radiation emitted depends on ΔE.
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20. Red? 21. Blue/green?
?
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5
7 etc
1
2
34
6
22. Why no
• 7 2
• 8 2
• 9 2?
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23. What happens to electrons?
1
234
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Chemical Ideas 6.2What happens when
radiation interacts with matter?
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Molecules are made of more than one atom but they still have
electrons.• Electronic
transitions
Vis + UV
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24. Molecules move ! How?
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25.There are vibrational energy levels as well as electronic energy level . ΔE in which
region?
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The answers …
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1. What colour is the light reaching my eye? Explain.
Red filter
Red
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2. What colour is the light reaching my eye? Explain.
Blue filter
Blue
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3. What colour is the light reaching my eye? Explain.
Colourless glass White
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4. What colour does the ball
look? Explain.
Red
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5. What colour does the ball
look? Explain.
Black
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6. What colour does the ball
look? Explain.
White
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7.What colour does the ball
look? Explain.Red
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8. What colour does the ball
look? Explain.Black
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9. The rays are …
•A. Refracted
•B. Reflected
•C. Dispersed
•D. Converged
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10. Name the 3 primary colours of light …
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Sometimes we use the wave model for light …
• λ (lambda)= wavelength
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11. Wavelength increases, Frequency ?
C
decreases
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energy
wavelength
frequency
12.
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c = λ ν
υcλ
c
c
νλ
c = speed of light = 3.00 x 108 m s-1
λ = wavelength m lambda
ν = frequency Hz ( or s-1 ) nu
c
Use m
for λ
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C = λν problems….
Work out v:
13. If λ is 3.00 m
14. If λ is 30.0 cm
15. If λ is 3.00 mm
Work out λ:
16. If ν is 3.00 x 1010 Hz
c = 3.00x108 m s-1
![Page 47: Chemical Ideas 6.7 Where does colour come from?. 25 questions to see what you’ve remembered](https://reader036.vdocuments.site/reader036/viewer/2022062407/56649d595503460f94a39727/html5/thumbnails/47.jpg)
Sometimes we use the particle model …hE
• Packages of energy are called photons
• Light is a stream of photons
• E = 6.63 x10-34 x 4.5 x 1014 = 3.0 x 10-19 J
14105.4 x Hz
h = 6.63 x 10-34 J Hz -1
Planck constant
![Page 48: Chemical Ideas 6.7 Where does colour come from?. 25 questions to see what you’ve remembered](https://reader036.vdocuments.site/reader036/viewer/2022062407/56649d595503460f94a39727/html5/thumbnails/48.jpg)
Rearranging again….
hE
h
E
E
h
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E = hν problems …
• h = 6.63 x 10-34 J Hz -1
• Planck constant
17. If the frequency is 1.089 x 106 Hz, what is the energy of each photon?
18. If E = 3.65 x 10-20 J per photon, what is the frequency (ν) of the radiation?
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19.
• Black background
• Coloured lines.
emission
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Spectroscopy• Sample of
hydrogen
• High voltage
• Prism
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• Electrons can only exist in fixed energy levels.
ΔE
h
E
• Electrons absorb energy and move to a higher energy level.
• The electrons drop back to a lower energy level and emit energy.
• The frequency of the radiation emitted depends on ΔE.
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20. 3 2 21. 4 2
?
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5
7 etc
1
2
34
6
22. Why no
• 7 2
• 8 2
• 9 2?
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visible ultra violet
E increases
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6
1
234
Balmer 2
E increasing
Lyman ?
1
234
1
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Absorption Spectrum of hydrogen.
• Continuous spectrum
• Black lines.
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How do the 2 compare?
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23.What happens to electrons?
1
234
• Electrons absorb energy
• Electrons are excited
• Electrons move to higher energy level
• E = h v
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Molecules are made of more than one atom but they still have
electrons.• Electronic
transitions
Vis + UV
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24. Molecules move ! How?
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25. There are vibrational energy levels as well as electronic
energy level ..
I.R.
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• Electronic transitions
Vis + UV
• Rotational transitions
• Vibrational transitions
Microwave
I.R.
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Chemical Ideas 6.7
Where does colour come from?
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•Absorb
•Transmits
•Complementary
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•Absorb
•Transmits
•Complementary
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•Absorb
•Transmits
•Complementary
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X2
X2*
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e-
e-
filter
meter
photocell
cuvette
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concentration
absorbance Absorbance α concentration