Chem 112 Final Exam Questions With Correct Answers Graded A+

Which of the following conditions is/are met at the equivalence point of the titration of a monoprotic weak base with a strong acid? - correct answers - The moles of acid added from the buret equals the initial moles of weak base - The pH of the solution is less than 7.00 What color change is exhibited by phenolphthalein during a titration of aqueous acetic acid with aqueous sodium hydroxide? - correct answers - Colorless to pink A statement of the first law of Thermodynamics is that: - correct answers - The total energy of the universe is constant As defined by Ludwig Boltzmann, the third law of thermodynamics states that: - correct answers - There is no disorder in a perfect crystal at 0 K Which of the following molecules will exhibit dipole-dipole intermolecular forces as a pure liquid? - correct answers - PH3 Arrange Cl2, ICl, and Br2 in order from the lowest to highest boiling point: - correct answers - Cl2 Br2 ICl Normal boiling temperature is defined as: - correct answers - The temperature at which the vapor pressure of a liquid equals 1 atm Which of the following nonpolar molecules has the highest boiling point? - correct answers - CS2 Place the following cations in order from lowest to highest hydration enthalpy: H+, K+, and Cs+: - correct answers - Cs+ K+ H+ A(n) __________ is a colloidal dispersion of a liquid in a solid. - correct answers - Gel Two nonpolar solvents such as hexane and carbon tetrachloride, may be miscible even though the enthalpy mixing of these liquids might be small. A reason that mixing occurs is that mixtures have greater disorder than pure solvents. The tendency toward disorder is a thermodynamic function called __________. - correct answers - Entropy The boiling points of some group 7A hydrides are NH3 (-33), PH3 (-88), AsH3 (-62). Which intermolecular force or bond is responsible for the high boiling point of NH3, relative to PH3 and AsH3? - correct answers - Hydrogen bonding How are the exponents in a rate law determined? - correct answers - They are determined by experimentation. What is Hydrogen bonding? - correct answers - A hydrogen bond is a type of attractive (dipole-dipole) interaction between an electronegative atom and a hydrogen atom bonded to another electronegative atom