What is a covalent bond?
a. a bond between two atoms of very different electronegativities
b. a bond between two atoms that is made up of shared elections
c. a bond between two ions of equal and opposite charge
d. a bond between two atoms resulting from a transfer of an electron

An uncovered pot of water lies out in the sun. which statements correctly describe what happens at the surface of the liquid water? 1. the vapor pressure remains constant regardless of the water temperature. 2. the vapor pressure is produced by water molecules that have evaporated. 3. the vapor pressure increases as the sun heats the water in the pot. 4. evaporation stops once the vapor pressure reaches a certain point. 5. evaporation and condensation both occur on the liquid’s surface.