Physical and Chemical Changes. Observing involves seeing, hearing, tasting, touching, and smelling. Physical property- are characteristics of materials.

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Physical and Chemical Changes

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Presentation transcript:

Physical and Chemical Changes

Observing involves seeing, hearing, tasting, touching, and smelling. Physical property- are characteristics of materials that can be observed or measured without changing the material. Physical Properties Physical Properties and Changes

Examples of Physical and Chemical Properties.

Concept of Change Change: the act of altering a substance

Physical Change Physical change: a change that occurs that does not change the identity of the substance  Melting ice (change in state or phase)  Freezing Kool-aid  Tearing paper  Boiling water (same as melting ice)

Chemical Changes Chemical change: a change that occurs causing the identity of the substance to change  Burning  Digesting food  Reacting with other substances A chemical change is called a chemical reaction NOT reversible

Chemical Changes Cont’d Indicators of a chemical change: Emission of light Production of heat Production of a gas Color change Formation of a precipitate  **Mg**

Is it Physical or Chemical? ChangePhysicalChemical Melting cheese Burning wood Milk souring (Do all students relate to this?) Wadding up paper Bicycle rusting

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