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10. according to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?

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

Aroller coaster car is traveling down a track at 22 m/s. the car has a mass of 2000 kg. what is the kinetic energy of the car? a) 22,000 j b) 968,000 j c) 484,000 j d) 44,000 j