A the melting point increases only b the melting

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A. The melting point increases only B. The melting point decreases only C. The melting point range broadens and lowers D. The melting point range sharpens and increases
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What happens to the melting point of a pure compound as impurity is added? A. The melting point increases only B. The melting point decreases only C. The melting point range broadens and lowers D. The melting point range sharpens and increases
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What happens to the melting point if you mix two solids with the exact same melting point together? A. Same melting point? B. Lower? C. Higher? Answer Depends on Intermolecular Forces In general, impurities lower a melting point Crystal lattice is disturbed
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When a mixture of two different compounds exhibits a very sharp melting point Plot of Temperature vs. Mol Percent *Use mol percent when plotting your graph..not wt%
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85 95 105 115 125 135 0 4.3 12 29 41 50 70 78.4 100 Temperature (°C) Mol % cinnamic acid in urea Temp vs Mol % Cinnamic Acid in Urea T1 T2
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2009 Macbook Pro solder points could be bad Some solder points have the eutectic mixture of lead and tin and some do not http://www.appleinsider.com/articles/08/12/09/ inquirer_claims_macbook_pros_may_use_problematic_nvidia_chips.html
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*Not Part of Experiment 1* n = sin i/sin r or c/ ʋ C= speed of light in vacuum (3.00 E8 m/s) ʋ = speed of light through the material
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n D 20 =
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Spectroscopic Methods Infrared- functional groups NMR- number of nuclei and their connections Mass Spectrometry- measurement of molecular mass and the mass of its fragments Chemists use a combination of these tools to deduce the molecular structure Read 13.7-13.16 in Bruice, 6 th Ed and also the chapter on IR in Mohrig
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Functional groups absorb different IR light Reported in wavenumbers (cm -1 ) E = h ʋ c= λʋ E = hc/ λ therefore E proportional to 1/ λ 1/ λ = wavenumber
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What is it really absorbing? The stretching vibrations between atoms
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Common Functional Groups NH, OH, CH, C=C, C=O, C-O O-H hydrogen bonding occurrence Broadness of absorption peak is due to H-bonding Some O-H stretches do not appear broad…why?
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