Astudent wants to experimentally determine the density of water in the lab, explain the measurements the student will make , the lab apparatus lequipment she will need to determine the density of water .

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.

A50.0g sample of liquid water at 0.0 c ends up as ice at -20.0 c. how much energy is involved in this change?

Light waves can move through , but they travel fastest when they move through a(n) .