Discuss briefly the significance of hydrogen as an alternative energy resource
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Hydrogen is the most abundant element on earth, an excellent fuel and could be stored and transported like natural gas to provide energy in large amounts wherever needed. If hydrogen is produced by the electrolysis of water, the only products are hydrogen and oxygen gases, and when hydrogen is burned, the only direct emission is water. Hydrogen fuel cells have been in production for years and are being used to power buses in several nations and soon may be adapted to power cars. Hydrogen fuel cells are very efficient, 35-70% depending on the design of the fuel cell. To convert to a hydrogen energy economy would necessitate major infrastructure development to transport and store the volumes of hydrogen gas required to power an industrial nation such as the United States, Japan, or Germany. Also, the effects of large-scale leaks of hydrogen into the atmosphere may have an accelerating effect on ozone depletion and needs further study. However, hydrogen is in practically inexhaustible supply and is a major candidate to replace fossil fuels.
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Seawater density increases with increasing salinity and decreasing pressure
a. True b. False
Carl and Don run separate chemical fertilizer manufacturing companies in the same industrial park. Both pollute the river flowing through the industrial park with waste from their manufacturing processes. In the table below, the first row shows the current level of waste that makes its way into the river from their respective operations. The table also sets out information that indicates how much it would cost each manufacturer to reduce its pollution by additional increments of 10 pounds. If each company is required to reduce debris by exactly 20 pounds, the total cost will be
A. $7 B. $14 C. $21 D. $30
Glacial abrasion leaves _______________—linear scratches, grooves, and gouges—where sharp-edged rocks scrape across bedrock
Fill in the blank(s) with correct word
Identify each of the substances in the following chemical reactions as acting as an "acid" or a "base."NH3 + H2O ? NH2- + H3O+
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