Which is true for a substance that releases energy? a. the energy release decreases the molecular motion and the kinetic energy of the substance. b. the energy release decreases the molecular motion but increases the kinetic energy of the substance. c. the energy release increases the molecular motion and the kinetic energy of the substance. d. the energy release increases the molecular motion but decreases the kinetic energy of the substance. e. the energy release is used only to change the state of the substance.

A0.10 m aqueous solution of sodium sulfate is a better conductor of electricity than a 0.10 m aqueous solution of sodium chloride. which of the following best explains this observation? (a) sodium sulfate is more soluble in water than sodium chloride. (b) sodium sulfate has a higher molar mass than sodium chloride. (c) to prepare a given volume of 0.10 m solution, the mass of sodium sulfate needed is more than twice the mass of sodium chloride needed. (d) more moles of ions are present in a given volume of 0.10 m sodium sulfate than in the same volume of 0.10 m sodium chloride. (e) the degree of dissociation of sodium sulfate in solution is significantly greater than that of sodium chloride.