What are the four challenges to turning the vision of hydrogen fuel into a reality?
What will be an ideal response?
First, there is hardly any hydrogen gas in the earth's atmosphere. We can produce hydrogen gas by heating water or passing electricity through it; by stripping it from the methane found in natural gas and from gasoline molecules; and through a chemical reaction involving coal, oxygen, and steam.
Hydrogen gas must be produced by using other forms of energy, and therefore has a negative net energy yield. Third, fuel cells are the best way to use hydrogen as to produce electricity, but current versions of fuel cells are expensive. Fourth, whether or not a hydrogen-based energy system produces less outdoor air pollution and carbon dioxide than a fossil fuel system depends on how the hydrogen gas is produced. Also, making hydrogen gas from coal or stripping it from methane or gasoline adds much more carbon dioxide to the atmosphere per unit of heat generated than does burning these carbon-containing fuels directly.
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The shifting of tectonic plates can cause ____________________
Fill in the blanks with correct word
Write an essay in which you discuss the characteristics and distribution of Japan's population, as well as the country's urban-agriculture dilemma.
What will be an ideal response?
Which of the following terms refers to an index for fuel consumption?
A. growing degree-days B. consumer price index C. mean annual temperature D. heating degree-days
X-rays have shorter wavelength than visible light; therefore, X-rays ________
A) cannot be detected because of their wavelength B) are higher energy than light waves C) have lower energy than light waves D) pass through materials because their photons are smaller than light photons