ACS Domain 8: Electrochemistry/redox Welcome to your ACS Domain 8: Electrochemistry/redox 1. ACS: Electrochemistry/redox Which electrode does the reduction reaction occur in a galvanic cell? Anode Cathode Salt bridge External circuit None 2. ACS: Electrochemistry/redox Which statement is true for the standard electrode potentials in electrochemistry? Higher positive potential indicates a stronger reducing agent Higher negative potential indicates a stronger oxidizing agent Higher positive potential indicates a stronger oxidizing agent Lower negative potential indicates a stronger reducing agent None 3. ACS: Electrochemistry/redox What is the effect of increasing the concentration of the cathodic reactant in a voltaic cell? Increases the cell potential Decreases the cell potential Has no effect on the cell potential Reverses the direction of electron flow None 4. ACS: Electrochemistry/redox Which reaction correctly represents the oxidation that occurs in a standard hydrogen electrode? H$_2$ $\rightarrow$ 2H$^+$ + 2e$^-$ H$^+$ + e$^-$ $\rightarrow$ $\frac{1}{2}$ H$_2$ 2H$^+$ + 2e$^-$ $\rightarrow$ H$_2$ H$_2$ + 2e$^-$ $\rightarrow$ 2H$^-$ None 5. ACS: Electrochemistry/redox What is the oxidation state of chromium in K$_2$Cr$_2$O$_7$? 6 3 12 7 None 6. ACS: Electrochemistry/redox A cell consists of a magnesium electrode in a 1 M Mg$^{2+}$ solution and a copper electrode in a 1 M Cu$^{2+}$ solution. What is the standard cell potential? 2.71 V 3.52 V 1.10 V 2.37 V None 7. ACS: Electrochemistry/redox Which species is reduced in the reaction 2 Al(s) + 3 MnO$_2$(s) $\rightarrow$ Al$_2$O$_3$(s) + 3 Mn(s)? Al MnO$_2$ Al$_2$O$_3$ Mn None 8. ACS: Electrochemistry/redox How many electrons are transferred in the balanced redox reaction involving the conversion of Cu to Cu$^{2+}$ and Ag$^+$ to Ag? 1 2 3 4 None 9. ACS: Electrochemistry/redox What is the effect of doubling the surface area of the electrodes in an electrochemical cell? Increases the rate of the redox reaction Decreases the rate of the redox reaction Has no effect on the reaction rate Halves the cell potential None 10. ACS: Electrochemistry/redox The Nernst equation is used to calculate the cell potential under non-standard conditions. What key variable does this equation introduce that is not considered in the standard cell potential? Temperature Pressure Concentration Catalyst presence None 1 out of 10 Time is Up! Time's up
