The piezoelectric effect, when generating ultrasound waves, involves the conversion of:
a. chemical energy to mechanical energy.
b. electrical energy to potential energy.
c. kinetic energy to electrical energy.
d. electrical energy to mechanical energy.

The reaction below shows a system in equilibrium. how would a decrease in temperature affect this reaction? a. the rate of formation of the gases would increase. b. the equilibrium of the reaction would shift to the left. c. the equilibrium would shift to cause the gases to sublime into solids. d. the chemicals on the left would quickly form the chemical on the right.