Chapter_3_Mass_Relationships_in_Chemical_Reactions-1

Chapter_3_Mass_Relationships_in_Chemical_Reactions-1 -...

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Click to edit Master subtitle style How many? atoms in molecule, ion… How much? Principles of Chemistry Jonathan Smith Monday, September 17 Chapter 2.1-2.7, Chapter 3.1-3.7
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Formula of Ionic Compounds Al2O3 2.6 2 x +3 = +6 3 x -2 = -6 Al3+ O2- CaBr2 1 x +2 = +2 2 x -1 = -2 Ca2+ Br - Na2CO3 1 x +2 = +2 1 x -2 = -2 Na+ CO32 -
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2.7
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2.7
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Chemical Nomenclature Ionic Compounds often a metal + nonmetal anion (nonmetal), add “ide” to element name BaCl2 barium chloride K2O potassium oxide Mg(OH)2 magnesium hydroxide KNO3 potassium nitrate 2.7
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Transition metal ionic compounds indicate charge on metal with Roman numerals FeCl2 2 Cl- -2 so Fe is +2 iron(II) chloride FeCl3 3 Cl- -3 so Fe is +3 iron(III) chloride Cr2S3 3 S-2 -6 so Cr is +3 (6/2) chromium(III) sulfide 2.7
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2.7
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Group Work Group Problem Z 2.75 Y 2.59 X 2.44* W 2.33 V 2.43* U 2.15 T 2.80 S 2.32 R 2.75 Q 2.59
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Click to edit Master subtitle style Mass Relationships in Chemical Reactions Chapter 3
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Natural lithium is: 7.42% 6Li (6.015 amu) 92.58% 7Li (7.016 amu) 7.42 x 6.015 + 92.58 x 7.016 100 = 6.941 amu 3.1 Average atomic mass of lithium:
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Average atomic mass (6.941)
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Molar mass is the mass of 1 mole of in grams eggs shoes marbles atoms 1 mole 12C atoms = 6.022 x 1023 atoms = 12.00 g 1 12C atom = 12.00 amu 1 mole 12C atoms = 12.00 g 12C 1 mole lithium atoms = 6.941 g of Li For any element atomic mass (amu) = molar mass (grams) 3.2
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One Mole of: C S Cu Fe Hg 3.2 Note: not a mole of nails
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Click to edit Master subtitle style How many? atoms in molecule, ion… How much? Principles of Chemistry Jonathan Smith Tuesday, September 18 Chapter 2.1-2.7, Chapter 3.1-3.7
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1 amu = 1.66 x 10-24 g or 1 g = 6.022 x 1023 amu 1 12C atom 12.00 amu x 12.00 g 6.022 x 1023 12C atoms = 1.66 x 10-24 g 1 amu 3.2 M = molar mass in g/mol NA = Avogadro’s number
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6.022 x 1023 atoms K 1 mol K = Do You Understand Molar Mass? How many atoms are in 0.551 g of potassium (K) ?
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This note was uploaded on 04/29/2008 for the course CHEM 107 taught by Professor Smith during the Fall '07 term at Gustavus.

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Chapter_3_Mass_Relationships_in_Chemical_Reactions-1 -...

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