Set#7- Chemistry-Physical/Chemical Properties and Changes

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Physical Properties
Physical Properties
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Can be observed with senses include: Appearance texture Color odor melting point boiling point Density- mass/volume solubility
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Chemical Properties
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The matter’s ability to under go a chemical change. Includes: Ability to rust Ability to react with an acid Ability to burn (flammability) Combustibility toxicity Color change
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Physical Change
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no new substance is created – may change state, shape, or size but still the same thing. – may dissolve Solid to Liquid to Gas Gas to Liquid to Solid
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Examples of Physical Change
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water evaporating or water changing to steam clothes drying in a dryer chopping wood – wood ground to sawdust rock breaking mixing Kool-Aid
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Chemical Change
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A new substance is made. The matter can not be changed back. Fe + S = Fe2S (Iron) + (Sulphur) = IronSulphide
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Signs of Chemical Change
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-gas bubbles (spontaneous, fizzle) -color change – leaves turning colors in the fall, rust appearing -disappearance of color – fading fabric -heat or light released (fireworks, explosion)
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Examples of Chemical Changes
Examples of Chemical Changes
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fruit rotting, food spoiling (souring) rust decay of plants (decomposition) burning wood silver tarnishing car burning gas Anything you cook, bake, or fry! Milk souring Fireworks
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Is this a physical or chemical change? dirt added to a puddle of water
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physical change
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Is this a physical or chemical change? making whip cream
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physical change
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Is this a physical or chemical change? baking soda fizzes with vinegar
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chemical change
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Is this a physical or chemical change? sharpening a pencil
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physical change
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Is this a physical or chemical change? sugar turns brown, then black with heat
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chemical change
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Is this a physical or chemical change? using hot water to expand a metal cup
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physical change
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Is this a physical or chemical change? cornstarch turns black with iodine
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chemical change

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