A ball is launched horizontally from a wall of height 1.8 m with an unknown initial velocity. It lands 4.5 meters from the wall. b) how long does it take, in seconds, for the ball to hit the ground?

In this synthesis reaction what products will form

In a laboratory, 1.55mg of an organic compound containing carbon, hydrogen, and oxygen is burned for analysis. this combustion resulted in the formation of 1.45mg of carbon dioxide and .89 mg of water. what is the empirical formula for this compound?

Some liquids can be distilled, but only at temperatures that are so high that it is impractical, or so high the compound decomposes. explain why distillation such compounds at significantly less than atmospheric pressure (some degree of vacuum) would solve this problem.