Calculate the mass of 2.50 × 10^4 molecules of nitrogen gas.

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Two people each hold the end of a rope and create waves by moving their arms up and down. this wave is best classified as a transverse wave because a) both the rope particles and the wave are moving in the same direction. b) the wave is moving up and down as the particles of the rope move horizontally. c) the wave is moving horizontally as the particles of the rope move up and down. eliminate d) the wave is moving in a parallel direction with the motion of the person's arms.

How does kepler second law of planetary motion overthrow one of the basic beliefs of classical astronomy