Chem Notes - Chapter 2 Transfer to chem 1a code is...

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Chapter 2 19:01 Transfer to chem. 1a code is  UGXVC-J4PQM Chemistry lecture 1: sept 24 material-why important?  research? question, experimentation, theory, law 2.2  Conservation of mass : mass is neither created or destroyed Law of multiple proportions:  when two elements forma series of compounds the  rations of the masses of the second element that combines with a 1 gram of the first  element can always be reduced to small whole number    2.3 Dalton's model: each element is made up of tiny particles the atoms of a given element are identical  chemical compounds are formed when atoms combine with each other chemical reactions involve reorganization of the atoms
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2.4 Avogadro hypothesis: equal numbers of atoms under the same conditions contain the  same number of molecules  relative mass of hydrogen = (% hydrogen/100)relative molecular mass 2.5 charge to mass ration: e/m = -1.76x10^8 C/g e = charge of electrons in coulombs  m = electron mass in grams Mass of an electron: 9.11x10^-31  -1 Mass of proton: 1.67x10^-27    +1 Mass of neutron: 1.67x10^27 2.6 A/z X  a = mass number (mass - atomic gives neutrons) z = atomic number (number of electrons and protons) x = element 2.7  Covalent bonds:  when atoms form bonds by sharing electrons  Ion: missing or having and extra electron Element Compound
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Element Compound  H2 element Na element He element O2 element Ch4 compound H2O compound  Cacl2 ionic compound  Lecture 2 september 27: 
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Chem Notes - Chapter 2 Transfer to chem 1a code is...

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