Lecture14 - Free energy and the Thermite reaction 2 Al s Fe...

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Unformatted text preview: Free energy and the Thermite reaction 2 Al ( s ) + Fe 2 O 3( s ) 2 Fe ( s ) + Al 2 O 3( s ) ) (reactants f H r n (products) f H p n reaction H ∑- ∑ = ∆ D H f KJ/mol Al Fe 2 O 3-826 Fe Al 2 O 3-1672 = ∆ reaction H {( 0 + (-1672)} - { (0) + (-826)} = - 846 kJ per 2 moles of Fe = 846 ‚ 5 5.82 ‚ 2 » 7 kJ per g of Fe produced Specific heat capacity of Fe is 0.45 J C-1 g-1 7000 J raises temperature by 7000 J g-1 (Fe) = 15 000 C 0.45 J C-1 g-1 Iron melts at 1535 C Fri. Oct. 3, 2003 Today’s Lecture • Quantum Mechanics and Atomic Theory • 12.1 Electromagnetic Radiation • 12.2 The Nature of Matter • 12.3 The Atomic Spectrum of Hydrogen – examine atomic theory and periodicity of elements – modern theory of atoms accounts for periodicity – quantum mechanics was developed to explain the behavior of light and atoms • Electromagnetic radiation: – visible light, x-rays, infrared, ultraviolet, etc. – one way energy can travel through space – has wavelike behavior and travels at the speed of light in vacuum Fig. 12.1 – waves have 3 characteristics: • wavelength ( l : lambda): meters – distance between 2 consecutive peaks – 1Angstrom (Å) = 1 x10...
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Lecture14 - Free energy and the Thermite reaction 2 Al s Fe...

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