* Chemical properties describe how a substance reacts or changes its composition when interacting with other substances. Examples include flammability, reactivity, and acidity.
* Physical properties describe the characteristics of a substance that can be observed or measured without changing its chemical composition. Examples include color, melting point, boiling point, and density.
Density is defined as the mass of a substance per unit volume. It's determined by the arrangement and packing of atoms or molecules, which is a physical aspect of the substance. It doesn't involve any changes to the substance's chemical makeup.
For example:
* Water has a density of 1 g/mL. This density doesn't change whether the water is in a liquid, solid (ice), or gaseous state. It's just the mass of the water molecules packed into a given volume.
* Iron has a much higher density than water. This is because iron atoms are much heavier and packed more tightly together than water molecules.
In summary, density is a physical property that depends on the physical arrangement and packing of atoms or molecules within a substance. It doesn't involve any chemical transformations.
