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.  

A researcher conducted a study to determine the effects of i…

A researcher conducted a study to determine the effects of insulin concentration on the adipogenesis of fibroblast cells. The absorbance of light by the dye OPD is directly proportional to the number of fat produced.  Interpret the results provided in the graph below and write a paragraph as if it were the Interpretation section of the lab report. Make sure to include the following information:   1. What is the effect of the different insulin concentrations in the fat produced by the adipocytes? 2. Provide a possible explanation for the results observed when insulin concentration increased from 1 to 4 ug/mL.