Question

A gravel can be broken down into different kinds of substances by physical processes. No chemical reactions are needed to separate different parts of gravel into pure substances. This is because gravel is a(n)
compound
element
homogeneous mixture
heterogeneous mixture

Answer 1

Gravel is a **heterogeneous mixture**. This means it is composed of different substances (like sand, stones, and pebbles) that can be physically separated without any chemical reactions. Each component retains its own properties, which is characteristic of heterogeneous mixtures.