Review Session - Exam 1 Micro(2)

Review Session - Exam 1 Micro(2) - Chem 109A Lecture #6...

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Chem 109A Lecture #6 Melting Points Melting point (mp) – the temperature at which its solid form is converted into a liquid. Packing – the arrangement including the closeness and compactness of the molecules. Alkanes – with an odd number of carbons pack less tightly and have a lower melting point than even number of carbons Solubility Solubility – “like dissolves like”, basically polar compounds dissolve in polar solvents and nonpolar compounds dissolve in nonpolar solvents. Reason for polar molecules – Polar solvent has charges that can interact with the partial charges on a polar compound. The negative pole surround the positive pole of the polar molecule. Solvation – interaction between solvent molecules and solute molecules Reason for nonpolar molecules – They dissolve because of van der Waals interactions between solvent molecules and solute molecules. Carbon Rule – A compound with four carbons is the middle ground for insolubility and solubility. Alcohol – Alcohols with fewer than 4 carbon are soluble in water, and with more than 4 carbons are insoluble in water. Alcohols with branched alkyl groups are
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Review Session - Exam 1 Micro(2) - Chem 109A Lecture #6...

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