Some baking soda and vinegar were weighed separately and the weights added together. the two substances are mixed and a chemical reaction occurred, producing carbon dioxide, sodium acetate, and water. when the three new substances are weighed and the weights totaled, which of the following will be true? a. there is no way to know, because changes in mass are random. b. the new weights will be more because there is more mass. c. the original weight will be more because there was more mass. d. the two weights will be equal, because the mass is the same.

Which type of substance ionizes partially and gives off hydrogen ions when dissolved in water? a. strong acid b. strong base c. weak acid d. weak base

Define the kinetic molecular theory

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.