Key Characteristics:
* Chemical Transformation: Chemical properties describe how a substance behaves when it undergoes a chemical reaction. This means its chemical composition changes, forming new substances.
* Observable Changes: These changes are often noticeable through observations like:
* Color change: e.g., iron rusting (reddish-brown)
* Gas evolution: e.g., baking soda reacting with vinegar (carbon dioxide bubbles)
* Precipitate formation: e.g., mixing silver nitrate with sodium chloride (white solid forms)
* Heat/light production: e.g., combustion reactions (heat and light released)
* Odor change: e.g., spoiled milk (sour smell)
* Intrinsic to the Substance: A substance's chemical properties are inherent and don't depend on its physical state (solid, liquid, gas) or amount. For example, the flammability of wood is a property of the wood itself, regardless of how much wood is present.
Examples of Chemical Properties:
* Flammability: The ability of a substance to burn.
* Reactivity: How readily a substance reacts with other substances.
* Corrosion Resistance: The ability of a substance to withstand chemical attack.
* Toxicity: The ability of a substance to harm living organisms.
* Acidity/Basicity: Whether a substance is acidic or basic.
In contrast to Physical Properties:
Physical properties can be observed without altering the substance's chemical composition. Examples include:
* Color
* Density
* Melting point
* Boiling point
* Hardness
In essence, chemical properties are about the chemical transformations a substance can undergo, while physical properties are about its observable characteristics.
