When a piece of copper metal at 100ºC was placed into a cup of water at 25ºC, the final temperature of both substances reached 30ºC within a minute. Which of the following statements is TRUE about the transfer of energy between the two substances? a. Copper lost less energy than the amount of energy gained by water
b. Copper gained the same amount of energy that was lost by water
c. Copper lost the same amount of energy that was gained by water

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.