Jake collected samples of two substances while he was out walking. After taking the samples home, he ran tests and found that one substance is slippery and conducts electricity in water. These properties made Jake conclude that the substance is probably .

The other substance continuously made bubbles of hydrogen gas when Jake dropped magnesium into an aqueous solution of the substance. Jake concluded that the second substance is probably

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.