Why does spilt petrol forms a slick on top of water

Which statement justifies that phosphine (ph3) is a polar molecule?

Determine the energy released per kilogram of fuel used. given mev per reaction, calculate energy in joules per kilogram of reactants. consider 1 mole of tritium plus 1 mole of deuterium to be a mole of “reactions” (total molar mass = 5 grams).

Which step in naming unsaturated hydrocarbons is used for alkenes but not alkynes