Which of the following statements is true about covalent bonds? a) The shared electrons provide both atoms with an octet.
b) Sometimes electrons are gained to provide an atom with an octet.
OC) Hydrogen will share its one electron to obtain an octet
O d) The shared electrons are attracted by the nuclei of both atoms.
e) both a and d.

why is arctic sea ice important? arctic sea ice keeps the polar regions cool and moderate global climate. sea ice has a bright surface; 80 percent of the sunlight that strikes it is reflected back into space. as sea ice melts in the summer, it exposes the dark ocean surface.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.