Physical/Chemical Change Whatley/Dey 2014

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Physical and Chemical Properties

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Presentation transcript:

Physical/Chemical Change Whatley/Dey 2014

Physical Properties An aspect of matter that can be measured or observed without changing the substances composition.

Example: density = mass/volume

Chemical Property The ability of a substance to change in the presence of other substances.

Let’s Look More Closely: Consider the following description of the following unknown substance: “It is a green liquid at room temperature. It vaporizes readily to form a greenish vapor. It boils at 101.2 C and freezes at -36 C. The density of the vapor is 8.72 g/L, and the density of the liquid is 4.32 g/ml (at 25.0 C). The element reacts with many metals including iron and aluminum and it combusts in the presence of oxygen.” Indicate which properties in this description are physical and which are chemical.

Physical and Chemical Change Physical change: No new substance created! Chemical Change: A new substance is created!

Example:

Gasoline burns…

An egg cooks…

Ice melts…

A banana is stepped on…

A penny turns color over time…

Water boils…

A nail rusts…

A wire is bent…