Base your answers
to questions 83 through 85 on the information below.
Fossil fuels produce air
pollution and may eventually be depleted. Scientists are researching
ways to use hydrogen as an alternate fuel.
A device called an
artificial leaf was invented to produce hydrogen and oxygen using
sunlight and water. The artificial leaf is an electrochemical cell.
Equations 1 and 2 below represent the reactions taking place in the
leaf. Equation 3 represents a reaction of hydrogen when used as fuel.
83 State one benefit of using the artificial leaf to produce
|Answer-->Fossil fuels are not being used. Almost any
viable answer will be accepted.
84 Explain, in terms of
energy, why the artificial leaf is an electrolytic cell. 
|Answer-->Energy is required
85 State the change in
oxidation number of oxygen during the reaction represented in equation