this artist's illustration shows
earth shortly after the moon
formed. earth was hot and vol-
canic, and contained no liquid
water. the moon was much
closer to earth than it is today.
over time, earth's surface began
to cool, forming solid land.
could life have existed on
earth
at the time shown in the illus-
tration? why, or why not?

idk i’m struggling too

the dissolution of polymer can be thermodynamically described in 2 steps.

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.