Question

1. which method would best separate iron filings from sand?

a. filtration b. evaporation c. distillation d. magnetism

1. a homogeneous mixture looks:

a. uneven b. layered c. the same throughout d. solid only

1. what happens to the solubility of most solids when temperature increases?

a. it decreases b. it stays the same c. it increases d. it disappears

Explanation:

Question 3

To separate iron filings from sand, we analyze each method: Filtration separates solids from liquids, Evaporation removes liquid from a solution, Distillation separates liquids based on boiling points, and Magnetism attracts magnetic materials (iron is magnetic, sand is not). So magnetism is the best method.

A homogeneous mixture has a uniform composition, meaning it looks the same throughout. Uneven (A) and layered (B) describe heterogeneous mixtures, and homogeneous mixtures can be solid, liquid, or gas (so D is wrong).

For most solid solutes, as temperature increases, the solubility (amount that dissolves) generally increases. This is because higher temperature provides more energy for solute particles to break apart and mix with the solvent.

Answer:

D. Magnetism

Question 4