Physical Properties Physical properties can be observed and measured without changing the kind of matter being studied. Examples: Melting point Boiling.

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Physical and Chemical Properties

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Presentation transcript:

Physical and Chemical Properties Physical and Chemical Change Chemical Equations and Reactions Notes

Physical Properties Physical properties can be observed and measured without changing the kind of matter being studied. Examples: Melting point Boiling point Density Color

Chemical Properties Chemical Properties can be recognized only when substances react or do not react chemically with on another; when they undergo a change in composition Examples: Reacting with Oxygen Flammability Rusting Reacting with Acids Metals react to form compounds Bases react to form water and neutralize

What is a physical change? The chemical composition of the substance does not change Changes in size, shape, or state of matter Example: Tearing paper Boiling Water Freezing Kool-aid

What is a chemical change? A change in which a new/different substance is formed Examples: Burning Paper Digesting Food Indicators of chemical change: Creation of light Creation of heat or temperature change Creation of a gas Color Change Formation of a precipitate

Physical or Chemical Change? Tearing paper Melting ice Digesting food Rusting bicycle Chopping Wood Baking a cake Making salt water Burning wood

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What is a chemical formula? A molecule of a compound is represented by a chemical formula Each element is represented by the symbol The number of each type of element is represented by a subscript

C6H12O6 Element Symbol Subscript

What is a chemical equation?? A chemical equation represents the changes that take place in a chemical reaction

Reactants Products 2H2O2 2H20 +O2 Coefficient: Multiply by subscript to calculate number of atoms

Reactants: Written before the arrow Products: Written after the arrow

Evidence of a Chemical Reaction A precipitate is a solid that forms when two liquids react with each other. The precipitate is a product of the chemical reaction Liquid + liquid  solid

Bill Nye- Simple Chemical Reactions http://www.youtube.com/watch?v=4lBFVd1yx3U