In 2015, a major driving force increasing the development and use of renewable energy is
A) the ability to capture the energy of the wind, sun, and water.
B) the global concern about climate change and costs that are now competitive with the costs of fossil fuels.
C) increased solar radiation and wind velocities over the past decade.
D) the ease with which solar and wind energies can be tapped in every region of the Earth.
B
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In a battery, the following two oxidation-reduction reactions are taking place: rxn A: Zn ? Zn+2 + 2e- rxn B: 2 NH4+ + 2e- ? 2 NH3 + H2Which reaction is taking place at the cathode?
A. rxn B B. rxn A C. The reaction takes place at the electrode, not the cathode. D. Both reactions are happening at both the anode and cathode. E. Both reactions are happening are happening at the electrode.
In a(n) ____ bond, elements share electrons
a. ionic b. van der Waals c. electromagnetic d. covalent e. noble
Formation of new organic matter through photosynthesis by autotrophs is referred to as ____
a. net production b. gross production c. secondary production d. primary production e. thermodynamic production
Which of the following materials has the highest specific heat?
A. Oceanic crust B. Continental crust C. Water D. Air E. None of these is correct.