In the periodic table, symbols for the elements are arranged according to _____.
a. size
b. charge
c. mass number
d. atomic number
e. electronegativity gradient
Question 2The extreme size of volcanoes on Mars indicates that
a. Mars has a much thicker crust than Earth.
b. water once flowed in streams on Mars.
c. large moving plates have not formed on Mars.
d. Mars has a much thicker crust than Earth and large moving plates have not formed on Mars.
e. Mars has a much thicker crust than Earth, water once flowed in streams on Mars, and large moving plates have not formed on Mars.
Question 3Substances that are _____ give up hydrogen ions when they dissolve in water.
a. basic
b. acidic
c. neutral
d. hydrophobic
e. buffered
Question 4_____________ is a very long and deep canyon on Mars.
a. Valles Marineris
b. Ishtar Terra
c. Tharsis Bulge
d. Lobate Scarp
e. Phobos
Question 5Cellular pH is kept near a value of seven, due to the action of:
a. salts
b. buffers
c. acids
d. bases
e. water
Question 6Mars has a sufficient mass and a low enough temperature that water molecules could exist in its atmosphere as vapor. One reason Mars's atmosphere does not contain a significant amount of water vapor is that
a. Mars formed in a part of the solar nebula that lacked oxygen.
b. Mars formed in a part of the solar nebula that lacked hydrogen.
c. all of the water vapor was released in the impact that formed Deimos.
d. ultraviolet radiation breaks the water molecule into less massive particles that can escape.
e. the water molecule combines readily with chlorine to form hydrochloric acid.
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