Physical Properties
* Definition: Characteristics that can be observed or measured without changing the substance's chemical composition.
* Examples:
* Color: The appearance of a substance (e.g., blue, red, white)
* Density: The mass per unit volume of a substance (e.g., water has a density of 1 g/cm³)
* Melting Point: The temperature at which a solid changes into a liquid
* Boiling Point: The temperature at which a liquid changes into a gas
* Solubility: The ability of a substance to dissolve in another substance (e.g., sugar dissolves in water)
* Hardness: Resistance to scratching or indentation (e.g., diamond is very hard)
* Conductivity: Ability to conduct heat or electricity (e.g., copper is a good conductor)
* State of Matter: Solid, liquid, or gas
* Changes: Physical changes are reversible. The substance retains its chemical identity.
* Example: Freezing water (liquid) into ice (solid) is a physical change because the water molecules haven't changed; they're just arranged differently.
Chemical Properties
* Definition: Characteristics that describe how a substance reacts with other substances or changes its composition.
* Examples:
* Flammability: The ability of a substance to burn (e.g., gasoline is flammable)
* Reactivity: How readily a substance undergoes chemical reactions (e.g., sodium is highly reactive)
* Oxidation: The tendency of a substance to react with oxygen (e.g., iron rusts when it oxidizes)
* Acidity/Basicity: The ability of a substance to donate or accept protons (e.g., lemon juice is acidic)
* Changes: Chemical changes are irreversible. The substance changes into a new substance with different properties.
* Example: Burning wood (a chemical change) produces ash, smoke, and gases. The original wood is no longer present.
In Summary:
* Physical properties are about what you can observe directly.
* Chemical properties are about how a substance interacts with other substances or changes its composition.
Let me know if you have any more questions!
