Introduction To Chemistry I
Introduction To Chemistry I CHM 12500
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This 2 page Class Notes was uploaded by Austen Pollich on Saturday September 19, 2015. The Class Notes belongs to CHM 12500 at Purdue University taught by John Nash in Fall. Since its upload, it has received 37 views. For similar materials see /class/207968/chm-12500-purdue-university in Chemistry at Purdue University.
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Date Created: 09/19/15
l N U 4 LI 9 gt1 General Procedure for Writing Lewis Structures Draw atoms central atom surrounding atoms relative to each other a For ABn compounds draw atom with lower group number in center b If atoms have same group number draw atom with higher period number in center c H forms only one bond ie never a central atom Sum the number of valence e39 of all atoms total number of valence e39 available a For anion add one valence e39 for each negative charge b For cation subtract one valence e39 for each positive charge Draw single covalent bond from each surrounding atom to the central atom For each single bond drawn subtrath e39 from total number of valence e39 available Distribute remaining valence e39 in pairs so that each atom has 8 e39 2 e39 for H a First place unshared e39 pairs on surrounding atoms b Place any remaining e39 on central atom If central atom does not have 8 equot change unshared e39 pair from one of surrounding atoms into bonding pair to central atom to make multiple bond Check that each atom has 8 valence e39 2 e39 for H Units of Concentration Molarity moles of solute volume of solution liters Molality m moles of solute mass of solvent kg Percent by mass mass of solute x 100 mass of solution Mole fraction moles of A XA Parts per million ppm mass of solute x 1000000 total mass of solution moles of A moles of B moles of C