Chapter 2, Problem 47E

Questions 47 and 48: Samples of matter may be classified in several ways, including gas, liquid, or solid (G, L, S); pure substance or mixture (P, M); homogenous or heterogeneous (Hom, Het); and, for pure substances, element or compound (E, C). For each substance in the left column of the tables shown, place in the other columns the symbol from the top of the column that best describes the substance in its most common state at room temperature and pressure. Assume that the material is clean and uncontaminated. (The first box is filled in as an example.)

	G, L, S	P, M	Hom, Het		E, C
Factory smokestack emissions	All, but mostly G
Concrete (in a sidewalk)
Helium
Hummingbird feeder solution
Table salt