19. If it takes more energy to break the bonds of the reactants than is released when the bonds of the products are formed, the reaction is
20. If a reaction is
, more energy is released when the bonds of the products are
formed than it takes to break the bonds of the reactants.

Motivation cannot be developed with practice; a person either possesses it or they do not.

What overall charge must all compounds have

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.