What must occur when an electron in an atom returns from a higher energy state to a lower energy state? (1) a specific amount of energy is released
(2) a random amount of energy is released
(3) the atom undergoes transmutation
(4) the atom spontaneously decays

Compared with the freezing-point depression of a 0.01 m c6h12o6 solution, the freezing-point depression of a 0.01 m nacl solution is

Modern weaponry has increased the number of deaths in wars and violent conflicts.

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.