Physical Properties Characteristics of a substance that can be observed without changing the substance Examples: color, shape, mass, length, and odor.

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Presentation transcript:

Physical Properties Characteristics of a substance that can be observed without changing the substance Examples: color, shape, mass, length, and odor

Chemical Properties Characteristics of a substance that indicates how it will react with other substances (“the ability to…”) The original substance is changed in observing a chemical property Examples: flammability, combustibility, neutralization, and ‘reactions’

Examples of Properties

Questions: Properties P =Physical Property C =Chemical Property The red color of an apple The ability of iron to rust Flammability of Gasoline Smell of roses Size of a pencil Density Acids react with bases

Physical Changes A change where the original substance still exists The substance only changes form Examples: cut, dissolved, absorbed, a phase change Click next slide to play video

Chemical Changes A change where a new substance is produced; the atoms have been rearranged When you can’t get the original substance back Properties of the new substance will be different

Chemical Changes Easily identified by the term ‘reacts’ Other ‘clues’: Release of a gas Change in color Release of energy (heat, light, etc.) Formation of a precipitate

Chemical Changes Click next slide to play video

Questions: Changes P = Physical Changes; C= Chemical Changes Cutting wood Digestion Baking bread Dissolving salt in water An apple rotting Melting ice Silver tarnishing

Law of Conservation of Mass Changes in state does not change the number of molecules in the substance or mixture 100 g of ice = 100 g of water = 100 g of water vapor

Rock Cycle Metamormphic Rock MELTING to Magma Magma COOLING to Igneous Rock Weathering of Igneous Rock to form Sediment Cementation of Sediment to form Sedimentary Rock

More Practice: Changes Identify as Chemical (C) or Physical Changes (P) A change in state Newspaper turning yellow Burning a candle Carving a turkey Milk going sour Antacid tablet in water Acid rain wearing down a marble statue Ice melting in a soda Sugar dissolving in Iced Tea Water turning to steam in your shower