In the reverse process of melting, the force of attraction between a substance's molecules select one:
a. increases.
b. decreases.
c. remains the same.
d. decreases and then increases.

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Which type of precipitation would most likely form when the surface air temperature is slightly below freezing and the air temperature increases as you move upward away from the ground?

Write the chemical formula for a compound that is made of an element from group 1 and an element from group 17