Here's why:
* Chemical properties describe how a substance reacts with other substances. This means they involve changes in the chemical composition of the substance.
* You can't see a chemical reaction happening at the molecular level. You might observe changes like color shifts, gas production, or heat release, but these are the *results* of chemical reactions, not the properties themselves.
Examples:
* Flammability: You can't see the tendency of something to burn, but you can see the *results* of burning (fire, smoke, etc.)
* Reactivity with acid: You can't see the potential for a substance to react with acid, but you might observe fizzing or color change after adding acid.
In contrast, physical properties can often be observed directly:
* Color: You can see the color of an object.
* Texture: You can feel the texture of an object.
* Density: You can observe how an object sinks or floats in water.
