What is the difference between an acid and a base? What is the pH scale?
What will be an ideal response?
"(A)n acid is any chemical that releases hydrogen ions when dissolved in water. A base is any chemical that releases hydroxide ions (OH, oxygen-hydrogen groups with an extra electron) when dissolved in water." pH is "(t)he concentration of hydrogen ions. . . ." The pH scale is a way of measuring the amount of hydrogen or hydroxide ions in a solution. It ranges from 0 to 14 . Numbers below 7 represent acids, and numbers above 7 represent bases.
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Which of the following statements about fission is true?
A. The fragments of a fusion reaction are always the same size. B. Bombarding a nucleus with neutrons always leads to fission. C. The amount of energy released in the fusion of small nuclei is very large. D. The amount of energy released in the fission of large nuclei is very large. E. none of the above
Other than natural seismic waves, what kinds of things create seismic waves that scientists study?
What will be an ideal response?
Plastics made of chitosan would
A) generate much more toxic emissions when burned for energy. B) be non-recyclable. C) persist for decades or centuries in landfills unless removed and burned as fuel. D) be biodegradable and could be composted.
Unlike Cenozoic mammals, mammals of the Mesozoic were uniformly small
Indicate whether the statement is true or false.