What volume of 2.0M HCl is needed to prepare 0.50L of a 0.75M solution? Please show your work

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

What was bohr’s contribution to the planetary model

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.