What physical property and reaction type are used by extraction as useful techniques to separate and purify mixtures of compounds

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Match term definition ellipse a) diagonal cross section of a cylinder circle b) diagonal cross section through the widest part of a sphere sphere c) cross section parallel to the base of a cone great circle d) shape created when a semi-circle is rotated around the y-axis triangle e) perpendicular cross section of a cone

Which statement names the physical property of wood a. wood is softer than coal b. wood does not rust c. wood can rot d. wood can burn