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Published byAdela Lyons Modified over 9 years ago
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Physical and chemical changes
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Physical Property: A characteristic of that can be measured without changing the chemical composition of a substance. Ex. Color, shape, size, density, melting point, boiling point, hardness, conductivity, malleability, ductility, state
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Slide 8 of 10
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Physical change: a change which does not change the identity of the substance Ex. Boiling, melting, changing shape, mixing, freezing, dissolving
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Chemical change: A change where a new substance is formed from other substances, and has new properties Burning O2 and H2 gives off H2O and energy
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Chemical property: A characteristic of a substance which indicates whether it can undergo a specific chemical change Ex. Flammability, reactivity, or non- reactivity
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Signs of a Chemical Change color change, formation of a precipitate, gases given off, energy change- heating up or cooling down, light,
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Signs of a reaction Precipitate: substance formed when a solid forms out of two liquids
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Energy change Endothermic: chemical reaction that absorbs energy or heat Exothermic: chemical reaction gives off energy or heat
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Exo vs. endo
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Law of conservation of mass Law of Conservation of mass: mass of all substances before a chemical reaction is equal to the mass of all substances after the reaction
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Extensive physical –Depend on the amount of the material present (ex. mass, length, & volume) Intensive physical –Does not depend on the amount of material present (ex. density, boiling point, ductility, malleability, color)
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Boiling Point Boiling point- Temperature at which vapor pressure overcomes atmospheric pressure. Does Water always boil at 100ºC Why or why not? What would it do in space?
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