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 Staff in Fall. Since its upload, it has received 16 views. For similar materials see /class/207975/chm-12500-purdue-university in Chemistry at Purdue University.
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Date Created: 09/19/15
Some Rules for Assigning Oxidation Numbers rule examples 1 Neutral substance that contains atoms of only one element 0 H2 Na C12 2 Monatomic ions charge on the ion Fez Zny Br39 3 Fluorine always 1 NaF C1F3 4 Group IA elements except H always 1 NaCl KCl 5 Group IIA elements always 2 MgC12 CaSO4 6 Group VIIA elements often 1 BC13 Nal 7 Oxygen usually 2 except in H2O a peroxides contain the 02239 group 1 H202 b superoxides contain the 0239 group 12 K02 8 Hydrogen can be either 1 or 1 a when bonded to a metal 1 NaH b when bonded to a nonmetal 1 HCl 9 Sum of oxidation numbers of atoms in molecule charge on molecule Hints First identify the atoms that always have a particular oxidation number 0 Use rule 9 to calculate the oxidation numbers for atoms which are not described by this set of rules Oxidation numbers are usually written with the sign followed by the magnitude 7this is opposite to the way charges on ions are written magnitude followed by sign Postulates of the KineticMolecular Theory 1 Particle Volume 0 Volume of each gas particle extremely small compared with volume of container 0 Each gas particle has mass but no volume 2 Particle Motion 0 Gas particles move in constant random straightline motion until they collide with other gas particles or container walls 3 Particle Collisions o All collisions are elastic energy exchanged when gas particles collide with other gas particles or with the container walls but no energy lost through frictional forces 0 Between collisions gas particles do not experience forces of attraction with each other or with the container walls 0 Total kinetic energy of collection of gas particles is constant
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