Chemistry B Final Exam Review Packet Winter 2017

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1 Chemistry B Final Exam Review Packet Winter 2017 The final exam will count as approximately 15% of your final grade in Chemistry B. Exam Format: Multiple choice ~35 questions Free Response/Calculations: ~35 points The exam will cover material from the entire trimester, but will emphasize material from the last unit including molecular structure, intermolecular forces, heating curves, calorimetry, and calculations involving heat. Materials you need to bring: Calculator, #2 pencil, Periodic Table with references on the back. Materials provided: VSEPR geometry sheet, any constants or values not provided on the periodic table, scan-tron, and scratch paper. Topics covered on the exam, and skills that may be assessed: Analyze and Report Measurements using Significant Figures and Units. Chapters 3 & 4 Accurately report measurements using the correct number of significant figures and units. Report calculated values using the appropriate units and significant figures. Molar Conversions, Percent Composition, Empirical and Molecular Formulas Ch 7: pp Use the Periodic Table to determine the molar mass of an element or compound. Determine the percent composition by mass of each element in a compound. Determine the empirical formula of a compound given the percent composition. Determine the molecular formula given molecular mass and an empirical formula. Kinetic Theory and Gas Laws Ch 12: pp Describe the motion of gas particles and interpret observable changes in temperature, pressure, and volume. Calculate the resulting temperature, pressure, volume, or number of moles of gas using gas laws equations. Molarity and Solutions Ch 18: pp Complete calculations involving molarity of solutions. Appropriatly apply the equations for molarity and dilutions. Stoichiometry Ch 9: pp Interpret a balanced chemical equation and use it to calculate how much product will be formed (in particles, mass, volume, or moles) when given the amount of another substance in the reaction. Identify which reactant is limiting and which reactant is in excess as well as calculate how much product can be produced (theoretical yield) when given quantities of reactants. Use a theoretical yield and actual yield to calculate the percent yield of a chemical reaction Covalent Compounds Ch 16: pp Draw the electron dot structure for compounds with a single central atom. Use VSEPR theory to identify the geometric shape of a molecule. Use electronegativity values and molecular symmetry to determine whether a compound is polar or nonpolar. Intermolecular Forces and Aqueous Solutions. Chapter 16 & 17 (pp & ) Predict the dominant intermolecular forces in a given molecule (dispersion forces, dipole interactions, and hydrogen bonds) based on its structure and the presence of polar bonds. Discuss how molecular structure and intermolecular attractions determine observable properties including solubility, adhesion, cohesion, surface tension, viscosity, volatility, melting point, and boiling point. Thermochemistry Ch 11: pp Explain how colligative properties including melting point and boiling point are related to the strength of intermolecular attractions between molecules in solution. Label and interpret heating and cooling curves for different materials. Describe the direction of heat flow during different chemical and physical processes. Identify chemical or physical processes as exothermic (releasing heat) or endothermic (absorbing heat). Complete calculations involving changes in heat, changes in temperature, specific heat, and calorimetry. Identify the phases and changes in phase on a heating curve and calculate changes in heat associated with changes in temperature and phase.

2 Measurement & Significant Figures: Ch Record the volume of liquid pictured to the left. Use the correct significant figures and units. 2. Someone else measures out 32.3 ml of liquid and adds it to the liquid you measured in problem 1, above. Calculate the total volume of the combined solution and record the value using significant figures and units. Molar Conversions, Percent Composition, Empirical and Molecular Formulas: Ch 7 (pg ) Mole Molar Mass Avogadro s Number Molar Volume of a Gas Percent Composition Empirical Formula Molecular Formula 1. Determine the number of representative particles in each of the following: a mol Al(OH) 3 c mol Hf b mol Ca(C 2H 3O 2) 2 d mol C 6H 12O 6 2. Determine the number of moles of each of the following: a Al(OH) 3 particles c g of Hf b L of CO 2 (@STP) d g of C 6H 12O 6 3. Find the empirical formulas for the given molecular formulas. The first one has been done as an example. a. C8H18 2 C 4H 9 c. C 2H 4O 2 e. C 6H 5N b. N 2H 4 d. P 4O 10 f. Se 3O 9 4. Determine the percent composition by mass of each element in the following compounds: a. LiCl b. Al(NO 3) 3 c. Hg(OH) 2 5. Use percent composition by mass to determine the empirical formula of each of the following compounds: a. A compound that is 34.43% iron and 65.57% chlorine. b. A compound that contains 85.6% carbon and 14.4% hydrogen. c. A compound that is 45.9% potassium, 16.5% nitrogen, and 37.6% oxygen.

3 6. Determine the molecular formulas for each of the following: a. A compound with a molecular mass of 78.1 g/mol and an empirical formula of CH b. A compound with a molecular mass of 32.1 g/mol and an empirical formula of NH 2 c. A compound with a molecular mass of 88.0 g/mol and an empirical formula of C 2H 4O Kinetic Theory and Gas Laws: Ch 12 (pg ) 1. Draw a graph showing the general trend for each of the following gas law relationships and identify whether the relationship is direct or inverse. P 1 V 1 = P 2 V 2 P 1 T 1 = P 2 T 2 V 1 T 1 = V 2 T 2 2. A rigid container holds a gas at a pressure of 55 kpa and a temperature of C. What will the pressure be when the temperature is increased to C? 3. A helium balloon has a volume of 25.0 L at kpa and 24 C. Determine its volume at standard temperature and standard pressure(stp). Standard Temperature: Standard Pressure: 4. Calculate the grams of oxygen (O 2) in a 12.5 L tank if the pressure is 25,325 kpa and the temperature is 22.0 C. Molarity and Solutions: Ch 18 (pg ) Solution Solute Solvent Molarity Dilution 1. Determine the molarity of a 100. ml solution made by dissolving 4.95 g NaCl in water. 2. Determine the mass in grams of H 2SO 4 in 15 ml of a 2.4 M H 2SO 4 solution. 3. Calculate the volume of 12. M HCl solution that will contain 1.0 moles of HCl. 4. Determine the final concentration of a solution made by diluting 23.4 ml of 6.0 M NaCl stock solution to a final volume of 250. ml

4 Stoichiometry: Ch 9 (pg ) Limiting Reactant Excess Reactant Actual Yield 1. Balance the chemical equation below, and use it for the questions 2 through 6: C2H6 + O2! CO2 + H2O 2. Determine the molar masses (with units) of each reactant and product: Theoretical Yield Percent Yield C 2H 6: O 2: CO 2: H 2O: 3. How many moles of CO 2 are formed when 3.7 moles of C 2H 6 are reacted with excess oxygen? 4. Determine the mass of water produced if 64.8 grams of C 2H 6 combust with excess oxygen. 5. How many liters of oxygen are needed to react with 12.5 L of C 2H 6? Assume standard temperature and pressure. 6. What mass of carbon dioxide gas will be produced when 15.6 g of C 2H 6 is reacted with excess oxygen? Calculate the percent yield if this reaction were carried out and only 40.6 g of carbon dioxide were produced. 7. Balance the chemical equation for the single-replacement reaction between aluminum and iron (II) sulfate, and use it to complete the following problems: Al (s) + FeSO4! Fe + Al2(SO4)3 8. Determine the molar masses of each reactant and product: Al : : : : 9. Calculate the number of aluminum atoms need to react with 2.56 moles of iron (II) sulfate. 10. How many grams of iron can be produced if 1.25 g of aluminum and 9.05 g of iron (II) sulfate are reacted? Which reactant is the limiting reactant? Which is the excess reactant? Determine the grams of unreacted excess reactant that remain after the reaction is complete.

5 11. In the lab, 0.55 grams of aluminum are reacted with excess iron (II) sulfate. Calculate the percent yield if the reaction produces 1.52 grams of iron. 12. Solid carbon and liquid water react to produce carbon tetrahydride gas and carbon dioxide gas. The balanced chemical reaction is written below. 2 C(s) + 2 H2O "CH4(g) + CO2(g) a g of solid carbon react with excess water. Determine the theoretical yield (in liters) of carbon tetrahydride gas produced at STP. b. How many liters of carbon tetrahydride can be expected from the reaction if the percent yield is 85.0 %? Covalent Compounds and Intermolecular Forces: Ch 16 &17 (pg & ) Vocabulary: Valence Electrons Octet Rule VSEPR Theory Electronegativity Polarity Intermolecular Force Dispersion Force Dipole-Dipole Forces Hydrogen Bonding Adhesion Cohesion Surface tension 1. According to the octet rule, most atoms become more stable when they have valence electrons. The exception to this rule is, which is most stable with valence electrons. 2. State whether the following compounds contain polar covalent bonds, non-polar covalent bonds, or ionic bonds, based on their electronegativities. Refer to the values in the table to the right, and your periodic table. a. KF d. Cl 2 ΔEN bond type nonpolar covalent b. SO 2 e. Na 2O moderately polar covalent very polar covalent c. NO 2 f. O 2 > 2.0 ionic 3. Describe how you will know whether a molecule will experience: a. dispersion forces b. dipole-dipole attractions c. hydrogen bonding 4. Give an example of each of the following, and describe how they are caused by intermolecular attractions. cohesion adhesion surface tension ion-dipole interactions

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