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Notes_Sept. 4

by: charlotteee

Notes_Sept. 4 25954

GPA 4.0
CHM Concepts, Systems, Practice 1

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CHM Concepts, Systems, Practice 1
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This 2 page Class Notes was uploaded by charlotteee on Monday September 7, 2015. The Class Notes belongs to 25954 at University of Rochester taught by Hafensteiner in Summer 2015. Since its upload, it has received 29 views. For similar materials see CHM Concepts, Systems, Practice 1 in Chemistry at University of Rochester.


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Date Created: 09/07/15
Jasmine Han Chemistry 131 Course Number 25954 Sept 4th 2015 Wrap Up of Chapter 2 Isotopes Have the same atomic number but different masses most atoms will have more than one isotope such as Hydrogen 1H 2H deuterium and 3H tritium Isotopes of Sodium when an atom has a different number of neutrons such as a sodium atom having 11 protons with 11 neutrons or a sodium atom having 11 protons but 13 neutrons The Na is the name of the element the lower subscript 11 will indicate the number of protons and the superscript tells us the total mass of the protons and the neutrons lsotopically averaged mass of an element Averaged Atomic Mass the sum of the atomic mass of isotope times the abundance p1 Important Key terms Mass Number Atomic Number Protons and Neutrons have the same mass 167103927 kg while the electron is much lighter weighing only 911x10 31 kg A Crystal arrangement means that the atoms are arranged and drawn in a 3D model and are modeled according to the size of the atoms Sodium Chloride NaCl has a relatively high melting point but dissolves readily in water because water is a solvent that is polar and can break up the NaCl molecules Binarv Compounds see previous notes for de nition Fe3 Iron lll ferric Fe2 Iron II ferrous Solving with Relationships cans times 39 grams of sugar bottles times 65 grams of sugar 2249 grams of cans of bottles 43 in total You will substitute the second equation into the rst one to obtain an equation Chapter 3 JJ Thomson did Mass Spectrometry which is used by injecting a sample into the device vaporizing the sample using an electron beam to ionize the sample and creating chargedelectri ed particles that accelerate towards the magnetic eld The charged particle beam is de ected and then the particles are separated by the magnetic eld based on the masscharge ratio Where the light beam hits on the detector will help us determine the mass of the particle 1961 the atomic mass scale was revised so that the mass of 12C has a value of exactly 12 However the 1201 of carbon on the periodic table is the average mass of all the isotopes of carbon atoms Moles a mole is an amount of substance that contains the same number of elementary entities as there are carbon12 atoms in exactly 12 grams of carbon12 Avogadro s number 60221371023 The mass of one 12C atom 120000 g 1 mole of 12C times 1 mol of 12C 602213710 atoms 1992648103923 grams When 200 grams of this substance is combusted 629 g of C02 and 258 g of H20 are produced Convert the mass of C02 to moles of C02 Molar mass of C02 is 1201 21600 4401 grams per mole Empirical Formula the simplest whole number ratio of the various types of atoms in a compound CH20 is the empirical formula for formaldehyde and acetic acid


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