Please help me for this question!! The product from the hydration of an alkene is mixed with acidified aqueous KMnO4 and heat. At the end of the experiment, the colour of the KMnO4 solution is purple.

Which of the following could be the alkene that was used?

A) Ethene
B) Propene
C) Isobutylene
D) 1,3-butadiene

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.