Solar Fuels Such as Hydrogen Are Being Studied as Sources

question 159

Multiple Choice

Solar fuels such as hydrogen are being studied as sources of energy.All of the following statements about hydrogen as a fuel source are true EXCEPT

• A)Fuels that are produced using sunlight as the energy source and water as the chemical feedstock are clean and renewable.
• B)Solar-hydrogen systems use materials that are abundant and do not harm the environment.
• C)Significant amounts of carbon dioxide would be emitted.
• D)Solar-hydrogen systems rely on compounds that increase efficiency.

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Definitions:

Aortic Semilunar Valve

A valve in the heart that lies between the left ventricle and the aorta, preventing backflow of blood into the ventricle.

Pulmonary Trunk

A major blood vessel that carries blood from the heart’s right ventricle to the lungs for oxygenation.

Pulmonary Arteries

are the arteries that carry deoxygenated blood from the heart to the lungs for oxygenation.

Myocardial Contraction

The phase of the cardiac cycle during which the heart muscle contracts, forcing blood out of the chambers.