Question

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. 1 and 2 2 and 4 3 only 2 only

Explanation:

1. Heterogeneous mixtures have components that separate over time (settle out) due to differences in density etc.
2. In heterogeneous mixtures, the ratio of solute to solvent can vary from one part of the mixture to another.
3. In heterogeneous mixtures, the solute is not evenly distributed; if it were evenly distributed, it would be a homogeneous mixture.
4. Heterogeneous mixtures are not necessarily composed of two solvents and two solutes; they can have varying numbers of components in different phases.

Answer:

1 and 2