Consider the transformations a water sample undergoes without external pressure variation (a) Transformations 2 and 4 are endothermic.
(b) Transformations 1 and 2 are exothermic.
(c) The amount of energy absorbed in 3 is equal to the amount released in 1.
(d) The amount of energy released in 2 is equal to the amount released in 4.
(e) The change of physical state does not involve heat energy.

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.