Which statements are true of heterogeneous mixtures? 1) they settle out. 2) the proportions of solute to solvent may vary. 3) the solute is evenly distributed throughout. 4) they are composed of two solvents and two solutes. a.1 and 2 b.2 and 4 c.3 only d.2 only

The statements that are true of heterogeneous mixtures are: they settle out and the proportions of solute to solvent may vary. The correct answer is option A. 1 and 2. Heterogeneous mixtures are considered mixtures wherein the components are not uniform and still retain their properties. Characteristics of heterogeneous mixtures are: the ratio of solute and solvent is not equal, the substances can be separated physically and they still retain their properties even if mixed with another substance.