Question

select all of the following that represent homogeneous mixtures.
brass (an alloy made of copper and zinc)
salt water
a cup of sand with pebbles
diamond
a cup of sand with pebbles

Explanation:

A homogeneous mixture has a uniform composition throughout. Brass is an alloy (a solid - solid homogeneous mixture). Salt water is a homogeneous mixture as salt dissolves uniformly in water. A cup of sand with pebbles is a heterogeneous mixture as the components are visibly distinct. Diamond is a pure substance (a form of carbon), not a mixture.

Answer:

Brass (an alloy made of copper and zinc), Salt water