MCAT Chem Domain 2: General Chemistry Welcome to your MCAT Chem Domain 2: General Chemistry 1. MCAT Chem: General Chemistry In a redox reaction, if the reduction potential of the cathode is +1.10 V and the reduction potential of the anode is -0.85 V, what is the standard electromotive force (EMF) of the cell? +1.95 V -0.25 V +0.25 V -1.95 V None 2. MCAT Chem: General Chemistry Which of the following statements is true regarding a reaction at equilibrium? The concentrations of reactants and products are equal. The rate of the forward reaction is zero. The rates of the forward and reverse reactions are equal. The reaction is no longer occurring. None 3. MCAT Chem: General Chemistry What is the pH of a 0.025 M HCl solution? 1.6 1.4 2 1 None 4. MCAT Chem: General Chemistry Which of the following changes would increase the solubility of a gas in a liquid? Increasing the temperature Decreasing the pressure above the liquid Increasing the pressure above the liquid Adding a nonpolar solute to the liquid None 5. MCAT Chem: General Chemistry A buffer solution is prepared by mixing equal volumes of 0.1 M acetic acid and 0.1 M sodium acetate. What is the pH of the buffer? 4.74 4.76 7 5.74 None 6. MCAT Chem: General Chemistry In a galvanic cell, the anode is the site of: Reduction Oxidation Salt bridge formation Proton exchange None 7. MCAT Chem: General Chemistry The quantum number 'm_l' is an indicator of: The shape of the orbital The size of the orbital The orientation of the orbital in space The spin of the electron None 8. MCAT Chem: General Chemistry Which of the following elements has the highest electronegativity? Fluorine Chlorine Bromine Iodine None 9. MCAT Chem: General Chemistry The Lewis structure of which molecule will have a formal charge of zero on all atoms? CO_2 SO_2 NO_2^- CO_3^2- None 10. MCAT Chem: General Chemistry What is the hybridization of the central atom in XeF4? sp sp^2 sp^3 sp^3d^2 None 11. MCAT Chem: General Chemistry In a voltaic cell, the standard reduction potential for the cathode is +0.34 V and for the anode is -0.76 V. What is the standard cell potential? +1.10 V -1.10 V +0.42 V -0.42 V None 12. MCAT Chem: General Chemistry Which of the following statements correctly describes the relationship between wavelength and energy for photons? Wavelength is directly proportional to energy. Wavelength is inversely proportional to energy. Wavelength increases as energy decreases, but they are not proportional. There is no consistent relationship between wavelength and energy. None 13. MCAT Chem: General Chemistry Which phase change is directly associated with the breaking of hydrogen bonds without changing the temperature? Melting Freezing Vaporization Sublimation None 14. MCAT Chem: General Chemistry Which of the following processes is endothermic? Combustion Deposition Evaporation Crystallization None 15. MCAT Chem: General Chemistry The Henderson-Hasselbalch equation relates which of the following pairs in a buffer solution? pH and pOH pKa and pH Concentration of acid and base pKa and pKb None 16. MCAT Chem: General Chemistry Which of the following is not a colligative property? Vapor pressure lowering Boiling point elevation Solubility increase Freezing point depression None 17. MCAT Chem: General Chemistry If the equilibrium constant for a reaction at a certain temperature is greater than 1, which of the following is true? The reaction favors the reactants at equilibrium. The reaction favors the products at equilibrium. No reaction occurs at this temperature. The reaction is not affected by temperature changes. None 18. MCAT Chem: General Chemistry Which principle explains the change in equilibrium position upon changing pressure or concentration? Le Chatelier's Principle Boyle's Law Charles's Law Dalton's Law None 19. MCAT Chem: General Chemistry In electrochemistry, what does the Nernst equation allow you to calculate? The cell potential under non-standard conditions The equilibrium constant from standard cell potentials The rate of an electrochemical reaction The concentration of ions in the electrolyte None 20. MCAT Chem: General Chemistry The Henderson-Hasselbalch equation relates which of the following pairs in a buffer solution? pH and pOH pKa and pH Concentration of acid and base pKa and pKb None 1 out of 20 Time is Up! Time's up
