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Select true or false for the following statements: [1] In vo…

Select true or false for the following statements: [1] In voltaic cells or electrolytic cells oxidation occurs at the anode and reduction at the cathode.[2] In an electrolytic cell, electrical energy is used to cause a chemical reaction to occur that would otherwise be nonspontaneous.[3] A salt bridge provides a path for electrons to move between the anode and cathode compartments of a voltaic cell.[4] A fuel cell, sometimes called a flow battery, is not self-contained.  The reactants (usually a fuel and oxygen) enter the cell and the products leave, generating electricity through controlled combustion of the fuel.[5] A buried iron pipe can be protected against corrosion by connecting it to a rod of zinc.

A hydrogen fuel cell operates with the following reaction ta…

A hydrogen fuel cell operates with the following reaction taking place at the anode: 2H2(g) + 4OH−(aq) → 4H2O(l) + 4e− What volume of H2 gas at 25°C and 170 atm is required for the fuel cell to run a motor drawing 8.5 A for 4.0 hours?            (1) 0.045L       (2) 0.091L      (3) 0.18L             (4) 0.36L         (5) 0.72L

For the electrochemical cell Pt(s) | H2(1 atm) | H+(1 M) ||…

For the electrochemical cell Pt(s) | H2(1 atm) | H+(1 M) || Cu2+(1 M) | Cu(s), which one of the following changes will cause an increase in the cell voltage?  (1) Lower the H2(g) pressure.(2) Lower the H+(aq) concentration.            (3) Increase the size/mass of the copper electrode.   (4) Decrease the concentration of Cu2+ ion.            (5) None of the above.