What happens when a substance undergoes a physical change? some physical properties change, but the substance keeps its identity. no physical properties change, and the substance keeps its identity. some physical properties change, and the substance changes its identity. no physical properties change, but the substance changes its identity.

The blackbody curve for a star name zeta is shown below. what is the peak wavelength for this star ?

Why is silver chloride is an ionic compound

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.