Here's why:
* Physical properties are characteristics that can be observed or measured without changing the substance's chemical composition. Examples include color, density, melting point, boiling point, and state of matter.
* Chemical properties describe how a substance reacts with other substances and changes its chemical composition. Examples include flammability, reactivity with acids, and the tendency to oxidize.
Liquids and gases are physical properties because:
* They are states of matter. A substance can exist as a solid, liquid, or gas depending on its temperature and pressure. These changes in state are physical changes, as they don't alter the chemical composition of the substance. For example, water (H₂O) remains water whether it's ice (solid), liquid water, or steam (gas).
* They are determined by physical characteristics. The state of matter of a substance is determined by the movement and arrangement of its molecules. In solids, molecules are tightly packed and vibrate in place. In liquids, molecules are more loosely packed and can move around. In gases, molecules are very spread out and move freely.
In summary: Liquids and gases are physical properties because they describe the physical state of a substance based on its molecular arrangement and movement, which can be observed and measured without changing its chemical composition.
