Summary: Grade 12 Chemistry (University)
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Read the summary and the most important questions on Grade 12 Chemistry (University)
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1 Atomic Structure (U1)
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What is thermal radiation?
Electromagnetic radiation emitted from surface of an object which is due to object's temperature -
What is a black body?
An object tht absorbs all electromagnetic radiation tht falls onto it- it is neither reflected or transmitted
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What is an example of a black body object?
Cast Iron Fry Pan /Kiln (black @ room temperature)- as
temp increases, produces radiation @ visiblewvlngths - starts @ red, then orange, yellow & white then blue
- as
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Why is a black shirt not a black body?
It cannot...- absorb certain amounts of heat
- radiate certain electromagnetic radiation
- emit thermal radiation
The t-shirt will light up in flames -
What is line spectrum?
- A spectrum consisting of
narrow , dark, parallel lines on a brightlycoloured bckgrnd
- A spectrum consisting of
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What is line spectrum produced from?
- Produced from a hot light source surrounded by cooler gases tht absorb & thus remove certain wvlengths
- Produced from a hot light source surrounded by cooler gases tht absorb & thus remove certain wvlengths
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1.1.1 Building Planck's Quantum Hypothesis
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What is the ultra-violet catastrophe?
Maximum intensity won't move into ultraviolet regions if more heat is added ∴ skewed bell curve -
Describe Planck's Experiment.
- Heat stayed same, intensity stayed same when heat was added
- intensity of thermal radiation of black body increases as black body was heated up
- Intensity would plateau even if heat increased, then Intensity will spike
- Heat stayed same, intensity stayed same when heat was added
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What is Planck's Equation?
E = hv
h = 6.6261 x 10^-34 J
v = frequency of radiation -
What is a quantum?
A small indivisible quantity ofenergy
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