Ammonia reacts with diatomic oxygen to form nitric oxide and water vapor: 4nh3 + 5o2 ==> 4no + 6h2o when 20. 0 g nh3 and 50. 0 g o2 are allowed to react, which is the limiting reagent?.

Ateacher attaches a ball to a meter long string and whirls it around in a horizontal circle at constant speed. the teacher explains that the string is what makes the ball go in a circle. why is the string necessary? a) the string is needed to apply a torque to the ball. b) the string is needed to push on the ball to get it up to speed. c) circle motion requires an inertia which is provided by the string. d) circle motion requires a force to give it a centripetal acceleratio