which one is a balanced equation and an unbalanced equation? picture and equation are in the picture. thanks!

Which best describes how johannes kepler developed his laws of planetary motion

Which change to the system wood cause the freely-moving piston to lower?

In chemistry, the type of an atom (what element it is) is determined by: a) the number of protons it contains in its nucleus. b) the number of neutrons it contains in its nucleus. c) the number of protons it has in a cloud around the nucleus. d) the number of neutrons it has in a cloud around the nucleus. e) the number of electrons it exchanges with its neighbors.