Section 3.2 Changes in Matter.

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Presentation transcript:

Section 3.2 Changes in Matter

Physical Changes Alter a substance without changing its composition Cutting paper Crumbling foil Changes in the state of matter are physical changes!! Only appearance was altered!

Condensation

Chemical Changes Process in which one or more substances change into new substances Also known as a chemical reaction Examples: Rusting Fermenting

Chemical Change

Five Indicators of Chemical Reactions 1. Change in Odor 2. Change in Color 3. Solid/liquid Precipitate is Formed 4. Gas Formed 5. Release/Absorption of energy (heat)

Odor Change

Color Change

Liquid Precipitate

Energy Released

Gas Formed

Conservation of Mass Mass in neither created nor destroyed during a chemical reaction Mass is always conserved This is a law!!!

Mass of Reactants = Mass of Products