The word "nitrogen" could stand for a(n)
a. atom.
b. element.
c. molecule.
d. all of these could describe nitrogen.

What effect might melting sea ice have for people who live in coastal areas?

The tendency of water molecules to stick together is referred to as a) adhesion b) polarity c) cohesion d) transpiration e) evaporation

What determines the average kinetic energy of the particles in a gas? a. the number of collisions b. the number of particles c. the size of the particles d. the temperature