Which does the presence of lone pairs contribute to the polarity of a water 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

According to each substances heat of fusion, which of the items below requires more heat to be added per gram of substance to go from solid to liquid? silver sulfur water lead

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation: