Physical and Chemical Change. Examples Burning Gasoline
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salt dissolves in water
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physical
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hydrochloric acid reacts with magnesium to produce hydrogen gas
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chemical
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a piece of copper is cut in half
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physical
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a sugar cube is ground up
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water is heated and changed to steam
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iron rusts
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chemical
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ethyl alcohol evaporates
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physical
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ice melts
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physical
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milk sours (goes bad)
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chemical
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sugar dissolves in water
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physical
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sodium and potassium react violently with water
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pancakes cook on a griddle
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grass grows on the lawn
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a tire is inflated with air
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physical
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food is digested in the stomach
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chemical
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water is absorbed by a paper towel
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physical
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ethyl alcohol boils at 79ºC
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paper burns
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water freezes at 0ºC
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fireworks explode
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alka-seltzer gives off carbon dioxide when added to water
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chemical
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clouds form in the sky
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physical
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color
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density
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burns easily (flammable)
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not effected by acids
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boils at 450ºC
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reacts violently with chlorine
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good conductor of heat
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dissolves readily in water
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melts at 145ºC
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malleable (bendable)
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grinding chalk into powder
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dissolving salt in water
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dissolving zinc in acid
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tearing a piece of paper
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stretching copper into wire
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burning gasoline
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hammering gold into foil
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melting ice
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digesting food
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making hydrogen from water
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chemical
