Which of the following best describes the process of electroplating?
a.) the application of a direct current to give an expensive metal the appearance and chemical resistance of a strong, cheap metal
b.) the application of a direct current to give a strong, cheap metal the appearance and chemical resistance of a more expensive metal
c.) the application of an alternating current to give an expensive metal the appearance and chemical resistance of a strong, cheap metal
d.) the application of an alternating current to give a strong, cheap metal the appearance and chemical resistance of a more expensive metal

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

What is the effect of returning nuclear reactor cooling water back into bodies of 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.