How are ions different from atoms?
a) An atom has a higher atomic number than an ion.
b) An ion has a neutral charge because it has an equal number of protons and electrons, whereas an atom has a positive or a negative charge.
c) An atom has more neutrons than an ion.
d) An ion has a higher atomic number than an atom.
e) An atom has a neutral charge because it has an equal number of protons and electrons, whereas an ion has a positive or a negative charge.
e) An atom has a neutral charge because it has an equal number of protons and electrons, whereas an ion has a positive or a negative charge.
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Refuse-derived fuel differs from normal garbage in that it
A. Is sorted B. Has agricultural wastes C. Is selectively collected D. Has coal added E. Is unsorted
A tangible geographic area in which no state exercises complete political control is called a(n)
A) frontier. B) ethnic border. C) colony. D) commonwealth. E) buffer.
Why are seafloor sediments useful in studying past climates?
What will be an ideal response?
Which of the following best describes the Distillation Method for desalination?
A) A current is run through positive and negative electrodes in freshwater separated by semipermeable membranes from seawater. B) Large icebergs are brought to coastal waters off countries that need freshwater where they are melted. C) Saltwater is boiled and the water vapor is passed through a cooling condenser, where it condenses as freshwater. D) Seawater is frozen and thawed multiple times, with the salts washed from the ice between each thawing. E) Water on the salty side of a semipermeable membrane is pushed under high pressure through the membrane to the freshwater side.