In a fuel cell using oxygen as the oxidizer and hydrogen as the fuel, what is the overall cell reaction? Answer a. H2O + 4 e- --> 2 H2 + 4 OH- b. H2O --> H2 + O2 c. 2 H2 + O2 --> 2 H2O d. O2 + 4 H+ + 4 e- --> 2 H2O

Which statement is not true about fission? Answer a. process requires initiation by a neutron b. critical mass produces a chain reaction c. combination of atomic nuclei d. products have smaller nuclei than reactants