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I swear I didn’t do it!! Ask Tony over at the Chemistry Lab!

Hey, Sal-- The coast is clear!. Don’t you EVAH mess with Vinnie again, do you undahstand me, Joey?. I swear I didn’t do it!! Ask Tony over at the Chemistry Lab!. Come on Sal, fuggetaboutit! give the kid a break, he didn’t mean to blow up the toilet with elemental Sodium and water!.

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I swear I didn’t do it!! Ask Tony over at the Chemistry Lab!

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  1. Hey, Sal-- The coast is clear! Don’t you EVAH mess with Vinnie again, do you undahstand me, Joey? I swear I didn’t do it!! Ask Tony over at the Chemistry Lab! Come on Sal, fuggetaboutit! give the kid a break, he didn’t mean to blow up the toilet with elemental Sodium and water! Where have you guys been? Livin’ in a hole somewhere?

  2. Intro Questions • If you have 12 eggs, what quantity do you have? • _______ • If you travel 5,280 feet, how far have you traveled? • ______ • How can something like this help us in Chemistry?

  3. Section 11-1: Measuring Matter • Mole(mol) – SI unit for ________ of substance • 1 mole of any substance = • ________ ______ (periodic table) of that substance in grams • 6.02 x 1023 representative particles (Also called Avogadro's number) • ________ —elements • __________ —covalent compounds • ________ _______--ionic compounds • Converting moles to _________ • Conversion Factors # moles x 6.02 x 1023 particles 1 mol • Convert 3.5 moles sucrose to molecules

  4. Section 11-1 continued • Converting particles to moles • Conversion Factors # particles x 1 mole = 6.02 x 1023 particles • Calculate the # moles in 4.50 x 1024 atoms Zn • More problems • page 311 #1-3; page 312 #4, 5-8

  5. Section 11-2: Mass and the Mole • 1 mole is also equal to the ______ _____ or mass of 1 mole • molar mass = _______ _______ with the units g/mol *Same as ______ ______ except for units Converting Moles to mass: # moles x # grams 1 mol • How many grams are in 3.00 mol Mn?

  6. Section 11-2: Mass and the Mole • mass to moles: mass x 1 mol #grams • How many moles are in 525 g Ca? • mass to atoms: mass x 1 mol x 6.02 x 1023atoms #grams 1 mol • How many atoms of gold in 25.0 g?

  7. Section 11-2: Mass and the Mole • atoms to mass: # particles x 1 mol x # grams 6.02 x 1023 particles 1 mol • How much mass is in 5.50 x 1022 atoms of helium? • More problems: • page 316 # 11-12; page 318 # 13&14; page 319 # 15-17

  8. Section 11-3 continued • Molar mass of compounds – add up parts #moles x molar mass = # grams • Find the molar mass of K2CrO4 • moles to mass # moles x # grams 1 mol Convert 2.50 mol of (C3H5)2S to grams

  9. Section 11-3 continued • mass to moles mass x 1 mol = molar mass • mass to particles mass x 1 mol x 6.02 x 1023 particles molar mass 1 mol • particles to mass particles x 1 mol x molar mass 6.02 x 1023 particles 1 mol • More problems: • page 321 # 20-24; page 322 # 25-26; page 323 # 27-29; page 324 # 30; page 326 #31-35; page 327 #36-39

  10. Section 11-4: Empirical and Molecular Formulas • percent composition mass of element x 100 = % by mass mass of compound • percent always adds up to 100 • Find % of H and O in water • Find the percent by mass of each element in Be3(PO4)2

  11. Section 11-4 continued • Empirical formula – smallest whole # mole ratio of the elements * May or may not be actual molecular formula • To get: • Change g to mol • Get mole ratio by dividing by the smaller • The ratios are the subscripts *If you are given % composition: assume % is grams • Find the empirical formula of a sample with 40.05 g S and 59.95 g O. • Do problems: p. 119 # 68 a & c, #69, #70

  12. Section 11-4 continued • Molecular formula – specific # of atoms of each element in compound experimentally determined molar mass = n mass of empirical formula • multiply n by empirical formula subscripts molecular formula = (empirical formula)n Problem: The empirical formula of a substance is CH. The molecular mass of the compound is 78 amu. What is the molecular formula of the compound?

  13. Sect. 11.4 cont. • Chemical analysis indicates a sample is composed of 40.68% C, 5.08% H and 54.24% O and has a molar mass of 118.1 g/mol. Determine the empirical and molecular formulas of succinic acid • More problems • Page 120, do 73 and 74

  14. Section 11-5: The formula for a Hydrate • Hydrate – compound with a specific # of water molecules bound to its atoms • Naming: • name salt • prefix hydrate • CaCl2•2H2O calcium chloride dihydrate • Prefixes are the same as those used for covalent compounds (see page 338 for review) • Anhydrous – without water used to store water or as drying agents • Used to store solar energy i.e. sodium sulfate decahydrate

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