CHEM 121 Final Exam Practice Problems for Part I 1 Provide the correct name or formula for each the following compounds a K2CrO4 e carbon tetrachloride b N2O5 f silver nitrate c Pb CO3 2 g sodium phosphide d HgS h sulfuric acid 2 For each of the following i Identify the type of reaction using the letters designated below Combination C Double Replacement Precipitation P Decomposition D Acid Base Neutralization N Single Replacement SR Combustion B TYPE ii Balance the equation a Al s Cu NO3 2 aq Cu s Al NO3 3 aq b NaOH aq H3PO4 aq H2O l Na3PO4 aq c K2CrO4 aq Mg NO3 2 aq MgCrO4 s KNO3 aq d LiHCO3 s Li2CO3 s H2O g CO2 g 3 For each of the following sets of reactants write NR for no reaction OR write the formulas for the products including physical states and balance the equation if a reaction occurs HCl aq a Zn s b LiOH aq H2SO4 aq c C5H12 l O2 g d HNO3 aq e Mg s KHCO3 aq H2O l Nuclear Chemistry Practice Problems 1 The inhalation of radon 222 and its decay to form other isotopes poses a health hazard Write balanced nuclear equations for the decay of radon 222 to lead 206 in eight steps a Step 1 Radon 222 decays by alpha emission Radon has the element symbol Rn b Step 2 The daughter product in part a decays by alpha emission c Step 3 The daughter product in part b decays by beta and gamma emissions d Step 4 The daughter product in part c decays by beta and gamma emissions e Step 5 The daughter product in part d decays by beta emission f Step 6 The daughter product in part e decays by alpha emission g Step 7 The daughter product in part f decays by beta and gamma emissions h Step 8 The daughter product in part g decays by alpha and gamma emissions The final stable isotope is lead 206 General Practice Problems 2 Indicate the number of protons neutrons and electrons in the following isotopes phosphorus 32 iodine 131 oxygen 18 Rn 222 chromium 51 fluorine 21 potassium 40 copper 64 3 For each of the following molecules H2O NH3 PCl3 OF2 CH4 CCl4 CHF3 O3 CH2O i Draw the Lewis structure and indicate the molecular geometry 3D shape and bond angle s ii Sketch the three dimensional shape of the molecule showing the dipole for each polar bond iii Indicate if each molecule is polar or nonpolar iv Indicate the intermolecular forces between molecules 4 Which of the following changes is exothermic melting condensing sublimation freezing vaporizing deposition 5 Calculate the molarity of a solution prepared by dissolving 4 488 g of potassium hydroxide in 150 0 mL of solution 6 Calculate the mass of solute present in 150 0 g of a 2 50 by mass AgNO3 solution 7 Calculate the concentration of solution prepared by diluting 5 00 mL of a 1 25 w v KCl solution to make 100 0 mL of solution 8 Calculate the concentration of solution prepared by diluting 8 00 mL of a 2 00M nitric acid solution with 100 0 mL of DI water