Define le chatelier's principle. define le chatelier's principle. when a chemical system at equilibrium is disturbed, the system shifts in a direction that minimizes the disturbance. a system will always change if the pressure changes. when a chemical system at equilibrium is disturbed, the system shifts in a direction that maximizes the disturbance. when a chemical system at equilibrium is disturbed, the system shifts in a direction that equals the disturbance. a system will always change if the volume changes.

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.