Lab8_AtomicSpectra-1

Lab8_AtomicSpectra-1 - C 125 Ex eimntal Che istry 1 pr e m...

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C125 Prelab C125 Exp er im en tal Che m i st ry 1
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Experimental Purpose Investigate what is meant by : Atomic fingerprint Continuous emission spectra Line emission spectra Determine : Energy of an emitted photon – Rydberg constant (R H )
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Important Terms for This Experiment Electromagnetic Radiation Atomic Emission Spectra Planck’s Quantum Theory Photon Speed of Light Bohr’s Theory Spectroscope Flame Test
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Definition of Electromagnetic Radiation The emission and transmission of energy in the form of electromagnetic waves Electromagnetic wave has an electric field component and a mutually perpendicular magnetic field component Comprised of small packets of energy called photons
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Definition of Atomic Emission Spectra Continuous or line spectra emitted by substances Encompasses all of the electromagnetic spectrum from x-rays to radio waves, including visually seen light Every element has a unique spectra which can be used to identify the atom = A tomic Fingerprint Emission intensity is measured by spectrometer
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Electromagnetic Spectrum 2 Wavelength (λ, nm) Energy (J) 4.96 x 10 -19 3.96 x 10 -19 3.30 x 10 -19 2.83 x 10 -19
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Plank’s Quantum Theory When solids are heated, they emit electromagnetic radiation Amount of radiation energy for a specific temperature is proportional to the wavelength Atoms and molecules emit energy in discrete quantities or quanta (sing. quantum) Quantum = smallest quantity of energy that can be emitted (or absorbed) in the form of electromagnetic radiation
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Definition of Photon Particle of light that when streamed together makes a beam of light Energy is emitted as photons E = hv h = Planck’s constant, 6.63 x 10 -34 J . s v = frequency of light, number of cycles that pass through a particular point in 1 second Emitted in whole number multiples of hv
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Definition of Speed of Light Each wave/packet of light can be described as having a speed or velocity (distance/time) c = λv c = speed of light in vacuumed air, 3.00 x 10 8 m/s; may change in different media λ = the length of the wave; distance/wave of light
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This note was uploaded on 11/02/2009 for the course CHEM C125 taught by Professor Staff during the Fall '08 term at IUPUI.

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Lab8_AtomicSpectra-1 - C 125 Ex eimntal Che istry 1 pr e m...

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