1.2 Elements of Life

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1.2 Elements of Life
Spectroscopy ­ The study of how light and matter interact, based of the principle that under certain
conditions, a substance can absorb or emit electromagnetic radiation
Absorption Spectra Emission Spectra
Absorption Spectra ­ Coloured background, dark lines
Emission Spectra ­ Black background, coloured likes
Wave theory
Light is a form of electromagnetic radiation
It behaves like a wave and has both wavelength and
The speed that a wave of light travels between two
points is the same. It has a value of 3.00 x 108
m s1
Different coloured light have different wavelengths
As wavelength increases, frequency decreases

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Particle Theory
Light is regarded as a stream of tiny energy packets called photons
The energy of a photon relates to its position on the electromagnetic spectrum
Bohr's theory
The electrons in an atom exist only in certain definite energy levels/electron shells/quanta
When an atom is excited, its electrons jump into higher energy levels
Later the electrons drop beck into lover energy levels and emit/absorb a photon of
light/electromagnetic radiation
The energy of the photon is equal to the difference between the two energy levels…read more

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Flame tests
Ion Colour Picture
Li+ Bright Red
Na +
Lilac…read more

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Ca2+ Brick Red
Ba2+ Apple Green
Cu 2+
Blue Green…read more


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