Chemistry: Physical vs. Chemical changes – Flashcards
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physical (sublimation)
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mothballs gradually vaporize in the closet
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chemical
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baking soda fizzes if mixed with vinegar
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physical
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calcium chloride dissolves in water and lowers the temperature at which water freezes and can be used to melt ice on city sidewalks
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physical (caused by chemical)
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chemistry majors get holes in the cotton jeans they wear to lab because of the acids used in many esperiments
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physical
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rubbing alcohol evaporates quickly
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physical
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acetone is used to dissolve and remove nail polish
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physical
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water freezes
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physical
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a stick is broken
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physical
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water boils at 100* C
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chemical
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a car rusts
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chemical
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banana turns brown
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physical
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butter melts
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chemical
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salicylic acid dissolves in the sodium hydroxide solution
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physical
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the mixture is filtered to separate the iron oxide
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chemical
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the filtrate is acidified to precipitate the salicylic acid
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chemical
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milk turns sour
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physical
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tearing a sheet of paper
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physical
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dissolving salt in water
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chemical
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burning toast
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chemical
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A newspaper yellowing from the sun
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chemical
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iron rusting
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physical
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water freezing
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physical
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change of state
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physical
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change of temperature
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physical
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change of volume
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chemical
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combustion
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chemical
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oxidation
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chemical
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decomposition (cant change and then go back)
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physical
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freezing, melting, boiling, vaporizing, change in size/shape, dissolving
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intensive
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independent of amount, of the substance present, density, boiling point, color
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extensive
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dependent on the amount of the substance present, mass, volume, energy
