Here's why:
* Chemical properties describe how a substance reacts with other substances. These reactions involve the formation of new substances with different compositions and properties.
* Physical properties, on the other hand, can be observed without changing the substance's composition. These properties include things like color, density, melting point, etc.
Examples of chemical properties:
* Flammability: The ability to burn in the presence of oxygen. This changes the substance's composition (burning produces ash and gases) and identity (it's no longer the original fuel).
* Reactivity: How easily a substance reacts with other substances. For example, sodium reacts violently with water, forming sodium hydroxide and hydrogen gas, completely changing its identity.
* Oxidation: The process of reacting with oxygen, which can alter the composition and identity of a substance. For example, iron rusts when it reacts with oxygen, forming iron oxide (rust).
In summary, chemical properties describe the ability of a substance to undergo chemical reactions, leading to changes in its composition and identity.
