Justine just added a new rock to her collection. To learn what type of rock it is, Justine wants to calculate the rock's density She first weighs the rock and finds that its mass is 43 g. To find its volume, she puts it in a container filled with 80 mL of water. When the rock is added, the water level changes to 100 mL, which is equal to 100 cm? The diagram below shows the water level change 100 mL 80 mL → + What is the density of the rock? A. 6.14g/cm

B 2.15g/cm

C 0.43

D 0.24​

Fossil fuels are organic compounds that are made from

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.

Silver reacts with oxygen to produce silver oxide. (write balanced chemical equation and identify type of chemical reaction.)