GENERAL CHEMISTRY I
GENERAL CHEMISTRY I CHEM 177
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This 2 page Class Notes was uploaded by Columbus Torphy on Sunday September 27, 2015. The Class Notes belongs to CHEM 177 at Iowa State University taught by Staff in Fall. Since its upload, it has received 8 views. For similar materials see /class/214551/chem-177-iowa-state-university in Chemistry at Iowa State University.
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Date Created: 09/27/15
Chapter 2 Leader Atoms Molecules amp Ions Course Supplemental Instruction Instructor Iowa State University Date Lauren Chem 177 Burnett 012609 1 Review of Dimensional Analysis and Signi cant Figures Complete the following problems show work and the correct number of sig gs A 5850 galhr to Us B The density of air at ordinary atmospheric pressure and 25 degrees C is 119 gL What is the mass in kg ofthe air in a room that measures 125 X 155 X 80 ft C 621 103 01050 D 2853 x 105 7 1200 x103x 28954 2 The law that states that the total reactant mass is equal to the total product mass is the 3 What are the four postulates of Dalton s theory of atoms 1 A Radioactivity 7 alpha particles high energy He nuclei targeted gold foil Found e foil but some re ected 180 Surmised most of mass of atom concentrated in a very small volume most of volume of B Discovery of electron All cathode ray tubes produced rays with the same properties Negatively charged particles with mass Determined the charge to mass ratio of electrons 176 X 108 Cg plum pudding model of atom electrons embedded in positive charged sphere like chocolate chips in a cookie 2 3 4 4 Match J39 J39 Thomson that most particles passed through th matter and atoms empty space 7 Robert Milliken 7 Rutherford C Measured the charge of an electron via the oil drop experiment Radiation was used to ionize oil droplets The rate at which the droplets fell in an electric eld was measured Used to calculate the integral charge on droplets 16 X 1039 19 C Using the charge to mass ratio could calculate the mass of an electron Supplemental Instruction 1060 HixsonLied Student Success Center 39239 2946624 39239 wwwsiiastateedu 5 What is the difference between an inorganic and an organic compound What are the two main types of inorganic compounds discussed Describe them 6 De ne m Isotope 7 the table 8 In any given atom the number of protons determines electrons determines neutrons determines O Label the following in the general isotope A gt Z 10 Complete the following Symbol 75As339 Protons 28 53 Neutrons 31 74 l 18 Electrons 26 76 Net Charge 1 3
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