Ch. 2 Physical and Chemical Properties/Changes
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Transcript of Ch. 2 Physical and Chemical Properties/Changes
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Ch. 2 Physical and Chemical Properties/Changes
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Properties
• Physical Property– can be observed without changing the identity of the substance• color• texture• density• viscosity• change in state• solubility• malleability• mass• volume• ductility• luster • boiling point, freezing/melting point
There are properties that are used to describe matter.
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Properties
• Chemical Property - describes the ability of a substance to undergo changes in identity
- a new substance is produced* reactivity* toxicity* pH* conductivity* fermenting* oxidation – such as rusting or tarnishing* flammability*combustibility
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• Examples:– viscosity
– reactivity
– density
– solubility
– tarnishing
physical
chemical
physical
physical
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Properties
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Matter’s Changes• Physical Change
– properties remain the same– changes the form of a substance without changing
its identity– All changes in state! (freeze, melt, condense,
evaporate, and sublimate)– Examples:• Boil, dissolve, break, split, crack, grind, cut, crush, and
bend.
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• Chemical Change– changes the identity of a substance– a new substance is produced– Examples: • rust, rot, burn, decompose, corrode, oxidize, ferment,
and explode!
– Evidence of a chemical change:• change in color or odor, formation of a gas, formation
of a precipitate (solid), change in light or heat
Matter’s Changes
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• A physical change during digestion is the mechanical breaking up of food by teeth.
• A chemical change during digestion is the chemical breaking down of food in the mouth, stomach and small intestine with the aide of enzymes.
Matter’s Changes
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• Examples:– rusting iron
– dissolving in water
– burning a log
– melting wax
– grinding spices
chemical
physical
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physical
Matter’s Changes
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Identifying extensive and intensive properties
• Extensive properties – the amount of substance present is important
examples include mass, volume and length• Intensive properties – the amount of substance
present does not matterexamples include density, color, odor, luster,
malleability, hardness, ductility, conductivity, melting/freezing point, boiling point
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Physical & Chemical Changes Game
Chemical
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Physical & Chemical Changes Game
Physical
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Physical & Chemical Changes Game
Chemical
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Physical & Chemical Changes Game
Physical
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Physical & Chemical Changes Game
Physical
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Physical & Chemical Changes Game
Chemical
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Physical & Chemical Changes Game
Physical
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Physical & Chemical Changes Card Game
Physical
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Physical & Chemical Changes Game
Chemical
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Physical & Chemical Changes Game
Physical
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Physical & Chemical Changes Game
Physical
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Physical & Chemical Changes Game
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Physical & Chemical Changes Game
Chemical
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Physical & Chemical Changes Game
Physical
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Physical & Chemical Changes Game
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Physical & Chemical Changes Game
Physical
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Learning Check
Which of the following changes involved in manufacturing an automobile is a chemical change?
a. applying paint to the body of the automobileb. making plastics from petroleum productsc. making steel from iron, carbon, and other metalsd. rolling out steel into sheets
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Learning Check
Which of the following is a physical change?
a. aluminum oxidizingb. an acid and a base forming a salt and waterc. ice cream meltingd. paper burning
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Learning Check
In the rock cycle, which of these is a chemicalchange involved with the formation of igneousrocks?F Compression of sedimentsG Heat loss from lavaH Subduction of platesJ Formation of minerals