Final answer:
A physical property is a characteristic of matter that can be observed or measured without changing the identity of the substance. Examples include color, density, and conductivity. A physical change is a change in the state or properties of matter without any accompanying change in the chemical composition. Examples include melting and crushing. Chemical properties describe the ability of a substance to undergo a chemical change, such as flammability. Three ways to recognize a chemical change are the formation of a gas, change in color, and release or absorption of heat. The difference between a chemical change and a physical change is that a chemical change results in the formation of new substances with different chemical properties, while a physical change only alters the physical state or properties of a substance.
Step-by-step explanation:
A physical property is a characteristic of matter that can be observed or measured without changing the identity of the substance. Examples of physical properties include:
- Color: The visual appearance of a substance.
- Density: The amount of mass per unit volume.
- Conductivity: The ability of a substance to conduct electricity.
- Melting and boiling points: The temperature at which a substance changes from solid to liquid and liquid to gas.
- Hardness: The resistance of a substance to being scratched or dented.
- Odor: The smell of a substance.
- Solubility: The ability of a substance to dissolve in a solvent.
Conductivity is the ability of a substance to conduct electricity. Density is the mass of a substance per unit volume. A physical change is a change in the state or properties of matter without any accompanying change in the chemical composition. Examples of physical changes include:
- Melting: Changing from a solid to a liquid state.
- Evaporation: Changing from a liquid to a gas state.
- Crushing: Breaking a solid substance into smaller pieces.
Chemical properties describe the ability of a substance to undergo a specific chemical change. Examples of chemical properties include:
- Flammability: The ability to burn.
- Reactivity: The ability to chemically react with other substances.
Three ways to recognize a chemical change are:
- Formation of a gas: Production of bubbles when two substances react.
- Change in color: A new color is observed after a reaction.
- Release or absorption of heat: Temperature changes occur during a chemical reaction.
The difference between a chemical change and a physical change is that a chemical change results in the formation of one or more new substances with different chemical properties. In contrast, a physical change only alters the physical state or properties of a substance without changing its chemical composition.