Changes in Matter Is It Physical or Chemical

Vaporization and Air Pressure at http //brookscole.com/chemistiv/ioesten4 

By contrast to physical changes such as boiling, there are processes that do result in changes of identity. When gasoline burns, it is converted to a mixture of carbon dioxide, carbon monoxide, and water. Burning in air, a property that gasoline, kerosene, and similar substances have in common, is classified as a chemical property. 

The word chemical is used to describe processes that result in a change in identity. The combination of hydrogen and oxygen to form water is a chemical change or chemical reaction—a process in which one or more substances (the reactants, which can be elements or compounds, or both) are converted to one or more different substances (the products, which can also be elements or compounds, or both). 

The word chemical is often used as a noun. In this sense, every substance in the universe is a chemical. You might read of polluted waters that contain 

Some physical properties are color, odor, melting point, boiling point, solubility, hardness, density, and state (solid, liquid, or gas). 

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