Chem 1211 1st Edition Lecture 5 Outline of Last Lecture I Unit Factor Method II Percentages III Properties IV Heat Units V Transfer Equation Constants Outline of Current Lecture I Atomic Numbers II Isotopes III Law of Definite Proportions IV Ions and Ionic Compounds V VI Complex Ions Moles Current Lecture I II III IV Atomic Number a Atomic number defines element i Is the number of protons or electrons e and p b Atomic weight i Protons and neutrons have about the same mass ii Electrons have much smaller mass Isotopes have the same atomic number electrons protons but differ in the number of neutrons a Atomic mass comes from natural average of all forms of hydrogen Law of Definite Proportions Constant Composition a Ration of elements atoms in a molecule b H2O means two hydrogen molecules for every oxygen c H2O2 is different from water hydrogen peroxide Ions and Ionic Compounds These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute V VI a Ions elements with more or fewer electrons than the corresponding atom b Cations positive charge c Anions negative charge d Metals form cations e Nonmetals form anions f IA alkali metal form 1 cations g IIA Alkali earth metals form 2 cations h VIIA Halogens form 1 anions i VIA form 2 anions j VA form 3 anions k Transition metals B series can form more than one cation Complex Ions a SO42b HSO4c H2SO4 sulfuric acid d PO43e HPO42f H2PO4g H3PO4 phospholic acid h CO32i HCO3j H2CO3 carbonic acid Moles a 6 022 x 1023 particles 1 mole Avogadro s Number b Atomic mass of element i E g 12 01 g Carbon 1 mole ii 26 98 g aluminum 1 mole 6 022 x 10 23 atoms
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