Question

Which of the following are pure substances? (Select all that apply.)

element

mixture

solution

compound

Answer 1

A pure substance is a material that has a consistent composition and distinct properties. Based on your options:

1. **Element** - This is a pure substance made up of only one type of atom. So, it is a pure substance.

2. **Mixture** - This is not a pure substance, as it consists of two or more different substances that can be physically separated.

3. **Solution** - While solutions can appear homogeneous, they are actually mixtures of solute and solvent. Therefore, a solution is not considered a pure substance.

4. **Compound** - This is a pure substance that is made up of two or more different elements that are chemically bonded together in fixed proportions. So, it is a pure substance.

Therefore, the pure substances from your list are **element** and **compound**.