* Chemical properties describe how a substance reacts with other substances. This means that observing a chemical property involves causing a chemical reaction, which inherently changes the substance itself.
* Examples:
* Flammability: Testing a substance's flammability requires applying heat, which causes a chemical change.
* Reactivity with acids: Mixing a substance with an acid to see if it reacts changes the substance's composition.
* Oxidation: Exposing a substance to oxygen to see if it rusts or corrodes alters the substance.
You can observe physical properties without changing the substance. Physical properties are characteristics that can be observed without changing the substance's composition. Examples include:
* Color
* Odor
* Melting point
* Boiling point
* Density
In summary: To observe chemical properties, you must cause a chemical change, meaning the substance is altered. You can observe physical properties without altering the substance.
