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:

• Analyze statement 1: Heterogeneous mixtures (e.g., suspensions) have particles that can settle out over time. So statement 1 is true.
• Analyze statement 2: In heterogeneous mixtures, the proportions of components (solute - like particles, solvent - like medium) can vary in different parts of the mixture. So statement 2 is true.
• Analyze statement 3: Even distribution is a property of homogeneous mixtures (like solutions). Heterogeneous mixtures have non - uniform distribution. So statement 3 is false.
• Analyze statement 4: Heterogeneous mixtures don't have a fixed number of solvents and solutes, and the concept of "two solvents and two solutes" is incorrect for defining them. So statement 4 is false.

Since statements 1 and 2 are true, we look at the options.

Answer:

1 and 2