Here's why:
* Combustion is a chemical reaction: It involves the rapid reaction between a substance with an oxidant (usually oxygen), releasing heat and light. This is a transformation of the original substance into new chemical compounds.
* Flammability and combustibility relate to the ease of combustion:
* Flammability refers to how easily a substance ignites and sustains combustion under specific conditions (like a flame or spark).
* Combustibility describes the ability of a substance to burn completely, releasing a significant amount of energy.
* These properties are inherent to the substance: Whether a substance is flammable or combustible is determined by its molecular structure and chemical composition. Factors like the presence of readily available bonds, the type of atoms, and the strength of the chemical bonds all influence how easily a substance will react with oxygen.
In contrast, physical properties are characteristics that can be observed or measured without changing the substance's chemical composition. Examples include color, density, melting point, and boiling point.
Therefore, because flammability and combustibility describe a substance's potential to undergo a chemical change (combustion), they are considered chemical properties.
