Students in Mr. Smith's science class were studying chemical versus physical reactions. One sign of a chemical reaction is the formation of a precipitate. The students combined various ionic solutions, looking for precipitates. The results of their experiments are displayed in the data table. Sarah suggested that a longer wait time would produce different results. Sally said that time had nothing to do with whether or not a chemical reaction occurred. She added that maybe using warm solutions would indicate different results as the particles within the solutions would have more kinetic energy.

What comment would you make about the experiment and the students discussion?