Popular in Chemistry 221
Popular in Chemistry
This 6 page Class Notes was uploaded by Alejandro Barnatan on Monday February 9, 2015. The Class Notes belongs to CHEM 221 at University of Oregon taught by Deborah Exton in Fall. Since its upload, it has received 48 views. For similar materials see Chemistry 221 in Chemistry at University of Oregon.
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I was sick all last week and these notes were exactly what I needed to get caught up. Cheers!
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Date Created: 02/09/15
Chem notes 100714 Cathode rays 0 discovered electrons 0 J Thompson determined ray particles velocity 0 milikans oil drop experiment look up Properties of electron charge 1602X1019 coulombs mass 9109X10 28 grams Neutral atoms charge 0 coulombs mass 16 X 1024 grams Rutherford s gold foil experiment results atoms mostly space occupied by electrons tiny region with all positive charged and neutral particles and dense called nucleus nucleus is 0000000000125 of the volume but 9997 of mass Coulombs law Energy is proportional to Charge 1 X charge 2 distance between them 1008 14 Isotopes 0 all atoms of an element have the same atomic number of protons 0 isotopes differ in mass because different of neutrons Mass number protons neutrons AMU atomic mass units defined as 112 the mass of a carbon 12 atom Metals ma11eab1e ducti1e genera11y shiny solids conduct heat and electricity well Nonmetals gases or dull brittle solids conduct heat and electricity poorly Metaloids have some properties of both metals and nonmetals 0 groupscolumnfamily have same properties What to know must know symbol to name and name to symbol for hydrogen to strontium 138 silver tin iodine xenon cesium barium tungsten platinum gold mercury lead bismuth radon 100914 Ionic compounds transferring of electrons Covalent compounds sharing of electrons Ions atomscompounds that lost or gained one or more electrons and are charged Cations positive charged ions anions negative charged ions Metals react with nonmetals metals losing electrons nonmetals gaining Monatomic ion ion formed from a single atom Polyatomic ion ion formed by two or more atoms covalently bonded Binary ionic compounds formed from two oppositely charged monatomic ions form 3D solid arrays maximizes coulomb attraction Attraction increases are charge increases also increases as size decreases Formula Unit 0 molecular formula analog for ionic compounds 0 cations are written first Subscripts refer to element preceding it formula unit must be neutral reduced to smallest whole numbers that retain correct ratio of ions for naming cation metal name first anion second take root of anion and add ide Elements that form multiple cations Transition metals tin lead etc Cation name of metal roman numeral denoting the charge Ex IrionIII Iron 11 Lead IV For metals who have two different stable ions two names suffix ous applies to smaller charge suffix ic applies to larger charge Polvgtomic ions ion formed from two or more atoms covalently bonded oxoanion families polyatomic ions where one element is bound to l or more 0 as No of oxygen atoms increases Prefix suffix per ite heyp ide 101014 Acids Combination of anion with hydrogen For naming hydro ic acid for oxoanions ate goes to ic acid ite to ous acid Covalent bonding basic unit of an element or compound consisting of two or more atoms covalently bonded have a specific formula Naming two nonmetals first goes lower group number second root of element with higher group number ide suffix and greek prefix if multiple of second element 101414 Naming compounds with halogens and oxygen halogen named first if group is same element with higher period first Straightchain alkanes look up molecular mass sum of atomic masses mixtures two or more substances physically intermingled 101514 Mole and mass 1 atom of N has mass 1401 amu 1 mol of atoms ofN has a mass of 1401 g molar mass of a substance is the mass per mole unit of its entities 0 gmol of atoms or amuatom
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