This chemical equation is balanced. F2+ 2NaBr – 2NaF + Br2
How does the balanced chemical equation show the conservation of matter
in this chemical reaction?
O A. The number of Fatoms in the reactants equals the number of F
atoms in the products.
B. There are more Br atoms in the reactants than in the products.
C. There are fewer Na atoms in the reactants than in the products.
D. The compound Naf is a substance that is different from the
compound NaBr

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.