Physical And Chemical Changes Terms – Flashcards
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Rusting Iron
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Chemical change
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Melting Ice
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Physical change
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Formation of stalagmites in a cave
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Physical change
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Fertilizing a lawn
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Chemical change
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What are the five signs or symptoms of a chemical change?
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Production of an odor, change in color, change in temperature/ production of light, formation of a gas/ bubbles, and formation of a solid called a precipitate
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Boiling water
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Physical change
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What is a chemical change?
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A change of one substance into a new substance.
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Breaking a tree limb
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Physical change
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Toasting marshmallows
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Chemical change
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Why is souring milk a chemical change?
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Souring milk produces an odor and forms new chunks in the milk, which are signs or symptoms of a chemical change.
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Burning paper
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Chemical change
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What is a physical change?
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A change in any physical property of a substance, but not the substance itself.
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Slicing a block of cheese
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Physical change
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The action of yeast in breadmaking
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Chemical change
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Erasing a pencil mark
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Physical change
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Salting ice on the sidewalk
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Chemical change
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Bleaching clothes
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Chemical change
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Why is bending a metal wire a physical change?
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Bending a metal wire changes the shape of the wire, which is a physical property, but does not change the molecular formation of the wire/ the stuff that makes up the wire. The wire is still a wire.
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Wadding up a sheet of paper
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Physical change
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Burning gas
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Chemical change
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Digesting foods
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Chemical change
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Chewing foods
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Physical change
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Evaporation of water
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Physical change
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Etching glass with acid
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Chemical change
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Crushing ice in a blender
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Physical change
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What are some ways to tell if a change is physical?
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You can tell if a physical change is occurring by asking yourself if there is a change in color, shape, size, texture, volume, mass, and/ or density. These are physical properties and if they are changing they are physical changes.
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A change from one substance into a new substance.
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Chemical change
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A change in any characteristic of a substance, but not the substance itself.
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Physical change
