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Final Bonds Lewis Structures Lab Potpourri 100 100 100 100 200 200 200 200 300 300 300 300 400 400 400 400 500 500 500 500 100 Bonds Define covalent bond Answer Bonds 100 attraction between atoms that results from sharing electron pairs 200 Bonds the bonded atoms have an unequal attraction for shared electrons Answer Bonds 200 polar covalent bond 300 Bonds Classify each of the following as PC, NPC or I bonds. Show numerical proof. Indicate d- for PC bonds. Sr-Cl All Play! Cl-I Si-P Al-H Answer Bonds 300 Sr-Cl EN diff = 2.0, Ionic dCl-I EN diff = 0.5, PC Si-P EN diff = 0.3 NPC dAl-H EN diff = 0.6 PC 400 Bonds How many bonds each do C and H have in a molecule? Answer Bonds 400 4 for C, 1 for H 500 Bonds List 3 elements that can have multiple bonds (double and triple bonds) Answer Bonds 500 Nitrogen Carbon Oxygen 100 Lewis Structures List the ABE formula, geometry, bond angles for each of the following: Answer Lewis Structures 100 AB2E2, bent, 105o AB5triangular bipyramidal, 90o and 120o 200 Lewis Structures Show resonance for a molecule of O3. Answer Lewis Structures 200 300 Lewis Structures Draw Lewis structures, identify ABE formula, geometry, bond angles, polarity NO2Cl GeH4 Answer Final Jeopardy Draw a Lewis structure for ethyl alcohol, C2H5OH Answer Final Jeopardy Answer Lewis Structures 300 AB3, triangular planar, 120o, polar AB4, tetrahedral, 109.5o, nonpolar 400 Lewis Structures For the models shown, list ABE formula, geometry, bond angles, assuming bonds are polar, is molecule polar? (yes or no) All Play! Answer Lewis Structures 400 o 109.5 AB4, tetrahedral, polar AB2E2 bent, o 105 , , yes yes polar 500 Lewis Structures Make models for the following: BeCl2 SiF4 Answer Lewis Structures 500 BeCl2 linear SiF4 tetrahedral 100 Lab What anion fizzes when HCl is added to it, yet it does not bleach KMnO4 soaked filter paper? Answer Lab 100 The carbonate ion 2CO3 200 Lab What lab test would you perform to determine if an unknown substance is either MgCl2 or Ni(NO3)2. State expected results for each identity. Answer 200 Lab The AgNO3 precipitate test would give a clear solution with Ni(NO3)2 and a cloudy, white precipitate with MgCl2 300 Lab Write the formula of the compound that has an Orange/yellow flame and bleaches KMnO4 soaked filter paper. Answer 300 Lab Na2SO3 400 Lab Circle all of the following that are electrolytes: H2SO4 NH4F CH4 KBr C6H12O6 Lab 400 H2SO4 is an acid. KBr and NH4F are ionic compounds. 500 Lab Describe 3 tests you could use to differentiate between NH4NO3 and K2CO3. Describe results expected in each test. Answer Lab 500 • test – add NaOH to (aq) compound, moistened red litmus over top turns blue • Add HCl. If CO32- present, will fizz. • Flame test – K burns peach 4+ NH 100 Potpourri all molecules have this type of intermolecular attraction Answer Potpourri 100 London forces 200 Potpourri Which of the following substances has hydrogen bonding between its molecules? Answer Answer for Potpourri 200 none – no bond btwn F and H Yes – O-H bond yes– N-H bond 300 Potpourri Of the following substances, which has the highest/lowest boiling point? C5H12 C3H8 C9H20 C4H10 Answer Potpourri 300 • All are nonpolar hydrocarbons, so lowest molar mass (C3H8) has lowest b.p. Highest molar mass (C9H20) has highest b.p. 400 Potpourri Which of the following substances has the highest boiling point. Explain your reasoning. Answer Potpourri 400 This compound is polar with hydrogen bonding between molecules. This strong intermolecular attraction will require more energy to break and move molecules apart into gas phase. CH4 is nonpolar. CH3F is polar and has weak dipole-dipole attractions only. 500 Potpourri List the three types of intermolecular forces in order of increasing strength. Answer Potpourri 500 Weakest: London forces (in all molecular compounds) Dipole-Dipole (all polar compounds) Strongest: Hydrogen bonding (in compounds with N-H, O-H or F-H bonding)