What type of bond is formed whenever atoms share a pair of electrons?
a. covalent
b. hydrogen
c. ionic
d. double
e. peptide
Question 2The greenhouse effect keeps Venus hot because
a. the atmosphere contains free oxygen.
b. the atmosphere is predominantly carbon dioxide.
c. the surface converts infrared into visible radiation.
d. the surface is free of sulfur compounds.
e. the magnetic field traps a large number of particles from the solar wind.
Question 3The bond in table salt (NaCl) is:
a. polar
b. ionic
c. covalent
d. double
e. nonpolar
Question 4The surface of Venus has been studied
a. using radar maps made from Earth.
b. using radar maps made from satellites orbiting Venus.
c. using spacecraft that have landed on the surface of Venus.
d. using radar maps made from Earth, using radar maps made from satellites orbiting Venus, and using spacecraft that have landed on the surface of Venus.
e. using radar maps made from satellites orbiting Venus and using spacecraft that have landed on the surface of Venus.