* Mixtures: Gunpowder is a mixture of several different chemical compounds:

* Potassium Nitrate (KNO3) - an oxidizer

* Charcoal (C) - a fuel

* Sulfur (S) - helps ignite the mixture

* Variable Composition: The proportions of these components can vary in different types of gunpowder, resulting in different burning rates and power.

In contrast, a pure substance consists of only one type of molecule or atom. Examples include water (H2O), gold (Au), or table salt (NaCl).