Select the correct reason why a pencil and not an ink pen should be used to mark a thin‑layer chromatography (tlc) plate. the pencil graphite will interact with organic compounds. the ink will trap the compounds in the samples and not allow them to migrate up the plate. the mobile phase can dissolve the ink and move it up the plate. ink can evaporate during the development of the plate.

What is the formula that this ionic compounds could form sr2+p3-o2-

What is the overall order of reaction for rate = k[no]2[o2]

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.