Which of these is a chemical property of aluminum? Aluminum has a density of 2.70 g · cm−3 Aluminum is silvery white in color. Aluminum is highly reactive. Aluminum is a soft metal.

Which of the following is part of the explanation or description of electromagnetic waves? (select all that apply) a. electrically charged molecules in a medium transfer their energy to nearby electrically charged molecules. b. a changing electric field causes a changing magnetic field. c. magnetic molecules in a medium transfer their energy to nearby magnetic molecules. d. a changing magnetic field causes a changing electric field.