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Quiz: March 8

Quiz: March 8. 2. 2K, 2O, 2 H on each side. Balance the following equations: K 2 O + H 2 O -> KOH H 2 O 2 -> H 2 O + O 2 H 2 + Br 2 -> HBr CS 2 + O 2 -> CO 2 + SO 2 Al + CuCl 2 -> Cu + AlCl 3 Translate the following:

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Quiz: March 8

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  1. Quiz: March 8 2 2K, 2O, 2 H on each side Balance the following equations: • K2O + H2O -> KOH • H2O2 -> H2O + O2 • H2 + Br2 -> HBr • CS2 + O2 -> CO2 + SO2 • Al + CuCl2 -> Cu + AlCl3 Translate the following: • Sodium reacts with sulfur to produce sodium sulfide. • Calcium carbonate decomposes to form calcium oxide and carbon dioxide 2 2 4 4 Reactants 2 O; Prod. 3 O 2 3 2 2 3 3 2 2 Na + S -> Na2S CaCO3 -> CaO + CO2

  2. 2 + Write the following equations and balance them. Cu+ OH1- Cl1- Ca2+ 1. copper (I) hydroxide reacts with calcium chloride to form copper (I) chloride and calcium hydroxide. balance the charges! ( )2 Cu+ Cl1- + OH1- Ca2+ 2 CuOH + CaCl2 -> CuCl + Ca(OH)2 2 balance the equation 2. Barium hydroxide reacts with hydrochloric acid, HCl, to form barium chloride and water. you try! Ba(OH)2 + 2 HCl -> BaCl2 + 2 H2O 3. Iron (III) oxide is formed by the reaction of iron and oxygen. 4 Fe + 3 O2 -> 2 Fe2O3

  3. REVIEW: How many of each kind of atom are in the following compounds. C and H 1 4 • CH4 • NaNO3 • H2SO4 • KCH3COO • Mg(OH)2 • Al2(SO4)3 Na N O 3 1 1 H S O 4 2 1 K C H O 1+1 =2 2 1 3 Mg O H 1 x 2 =2 1x 2 = 2 1 Al S O 2 3 x 1 = 3 3 x 4 = 12

  4. REVIEW. Basic Skills needed • Finding the gram formula mass • separate the elements • look up the atomic mass in the periodic table • figure out how many of each atom are in the formula • subtotal the masses of the elements • Find the total mass of the compound. ex: Al2(SO4)3 x 2 x 3 x 12 = 54 = 96 = 192 Al S O 2 3 12 27 32 16 = 342g mole

  5. Review: Putting it all together: 2(35) = 70g/mole • What is the molar mass of chlorine, Cl2? Balance the following equation: • CaCl2 + Na3PO4 -> Ca3(PO4)2 + NaCl • In the above equation, if we get 2 moles of NaCl, how many moles of CaCl2 would we have used? • In the above problem, how many grams of sodium chloride did we get? • How manygrams of CaCl2 did we use? 3 3 2 6 mole of calcium chloride would be used. 23 + 35 = 58 g/mole NaCl 6 moles NaCl 58g NaCl = 348 grams NaCl 1 mole NaCl 40 + 2(35) = 110g/mole 110 g CaCl2 3 mole CaCl2 = 330 grams CaCl2 1 mole CaCl2

  6. Review: Stoichiometry (Chapter 9 Black Book) • READ and UNDERLINE important parts of the problem. • Write Balanced Formulas • + = - ex: Ca2+ and P3- make Ca3P2 each having 6 charges • 6+ balances out 6- • Write Balanced Equations • use coeficients to make atoms in reactants = same atoms in products • Find moles of “known” • Find moles of “unknown” • Make sure the questions are answered.

  7. Review: • What mass of Mg(OH)2 will react with 1.20 grams of HCl. • Mg(OH)2 + 2 HCl -> MgCl2 + 2 H2O 2 1 1.20 g 0.97 grams  (36 g/mole HCl) x 58g/mole Mg = 24 2O = 32 2H = 2 = 58g/mole 0.033 moles HCl 0.017

  8. Finish the Following for homework #32 p and 59,60 page 245 This was assigned about 1 month ago! 32. The compound “cisplatin” has been found to be effective in treating some types of cancer. It can be synthesized using the reaction on page 237 of your book. a) How much “cisplatin” can be produced from 2.50 g PtCl2(NH3)2 and excess NH3. ? b) How much NH3 is needed? 59. In the decomposition of sodium chlorate, 31.7 g of oxygen are formed. How many grams of sodium chloride are produced? NaClO3 -> NaCl + O2 (unbalanced reaction) 60. The action of carbon monoxide on iron (III) oxide can be represented by Fe2O3 + 3 CO -> 2 Fe + 3 CO2. How much carbon monoxide is used if 57.5 g of iron were produced? EXTRA CREDIT IF COMPLETED BEFORE CLASS TOMORROW

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