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Published byIsabella Johnston Modified over 9 years ago
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Starter – 4/11 Physical characteristics can be used to describe and distinguish a person from other people. An accurate physical description can often be used to identify a person in a crowd. Practice identifying physical characteristics with the animals listed below. tiger lioncheetahleopard bobcat 1.What characteristics make these animals similar? 2.What characteristics make them different?
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How to tell the difference Physical and Chemical Changes
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Physical Change- – physical properties change, but the substance is the same – Change in what you see but does not produce a new substance Painting a house, cutting hair, ironing shirt, melting water/boiling water
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Some physical changes are reversible, some are not Reversible—freezing & melting water, braiding hair Non-reversible—slicing a tomato, peeling an orange
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It’s a physical change if It changes shape or size It dissolves.
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It changes phase (freezes, boils, evaporates, condenses) It’s a physical change if...
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Chemical Change Chemical Change- – when substances react to form one or more NEW substances – Look for permanent change in color, gas bubbles, leftover solid – Non-Reversible
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It’s a chemical change if…. It burns Temperature changes without heating/cooling
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It’s a chemical change if... It bubbles (makes a gas)
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It’s a chemical change if... It changes color permanently It forms a leftover solid
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– Examples: Silver ring that turns green Rusting cars Copper pennies turning green Baking powder in cake – cake rises Vinegar and baking soda Adding vinegar to milk Lighting a match Explosion or burning of wood
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What kind of change is it if someone... Tears up paper? Physical change Mixes salt and water? Physical change
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What kind of change is it if someone... Burns paper? Chemical change Evaporates salt water? Physical change
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What kind of change is it if someone... Mixes vinegar and baking soda? Chemical change
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