Give the total number of atoms in 3 molecules of caffeine (C8H10N4O2)

Which terms are used to identify pure substances

Avolleyball player hit a ball with a mass of 0.25 kg. the average acceleration of the ball is 15.5 m/s². how much force did the volleyball player apply to the ball? 62.0 n 3.87 n 62.0 m/s² 3.87 m/s²

State one important difference between a physical change and a chemical change?