PLEASE ANSWER ASAP A classmate argues that the changes in energy that occur in a pendulum are unrelated to the energy changes that a burning log undergoes. She points out that the burning of a log is an irreversible chemical change in matter, while the energy changes in a moving pendulum are constantly reversing, and are examples of physical changes. Evaluate your classmate’s argument.

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.