Physical Property: Describes a substance’s appearance. Chemical Property: Describes how matter reacts to change into other chemically different substances.

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Presentation transcript:

Physical Property: Describes a substance’s appearance. Chemical Property: Describes how matter reacts to change into other chemically different substances.

Clues that a Chemical Change has taken place: Formation of a gas Formation of a precipitate (solid that won’t dissolve) Release or absorption of energy A change in color

Are the following examples chemical or physical changes?

When food is chewed?

When fireworks explode?

When a rock breaks?

When a steak is grilled?

When a pond freezes?

When sugar dissolves in tea?

Intensive Properties : Properties that remain the same no matter how much matter is present. Extensive Properties : Properties that depend on the amount of matter present.

IntensiveExtensive Color Odor Luster - shininess Malleability – ability to be hammered Ductility - ability to be drawn into wire Conductivity – Flow of energy or electricity Hardness Melting/Freezing Point Boiling Point Density - how compact something is Mass Volume Length

Solids Structure? Definite Volume? Definite Shape? Liquids Gases Compress- ibility?