1 chapter 3 matter and energy 3.2 properties of matter copyright © 2008 by pearson education, inc....
TRANSCRIPT
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Chapter 3 Matter and Energy
3.2 Properties of Matter
Copyright © 2008 by Pearson Education, Inc.Publishing as Benjamin Cummings
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Matter
Matter • Has characteristics called physical
and chemical properties.
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Physical Properties
Physical properties are
• Characteristics observed or measured without changing the identify of a substance.
• Shape, physical state, odor, boiling and freezing points, density, and color of that substance.
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Physical Properties of CopperCopper has the followingphysical properties:• Reddish-orange• Very shiny• Excellent conductor of
heat and electricity• Solid at 25C• Melting point 1083C• Boiling point 2567 C
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States of Matter
The states of matter are
• Solid
Definite volume and shape• Liquid
Definite volume, but take the
shape of its container• Gas
No definite volume or shapeCopyright © 2008 by Pearson Education, Inc.Publishing as Benjamin Cummings
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Examples of States of Matter
Solids• Rocks, shells, baseballs, tennis
racquets, books
Liquids• Lakes, rain, melted gold, mercury in a
thermometer
Gases • Air, helium in a balloon, neon in a neon
tube
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Learning Check
Identify the state of matter for each of the following:
A. Vitamin tablets
B. Eye drops
C. Vegetable oil
D. A candle
E. Air in a tire
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Solution
Identify the state of matter for each of the following:
A. Vitamin tablets solid
B. Eye drops liquid
C. Vegetable oil liquid
D. A candle solid
E. Air in a tire gas
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A physical change occurs in a substance if there is
• A change in the state.• A change in the physical shape.• No change in the identity and
composition of the substance.
Physical Change
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Examples of Changes of State
Some changes of state for water: • Solid water (ice) melts and
forms liquid water.• Liquid water boils and forms
gaseous water (steam).
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Examples of Physical Changes
Examples of physical changes: • Paper torn into little pieces
(change of size)• Copper hammered into thin
sheets (change of shape)• Water poured into a glass
(change of shape)
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Learning Check
Classify each of the following as a
1) change of state 2) change of shape
A. Chopping a log into kindling
B. Water boiling in a pot
C. Ice cream melting
D. Ice forming in a freezer
E. Cutting dough into strips
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Solution
Classify each of the following as a
1) change of state 2) change of shape
A. (2) Chopping a log into kindling
B. (1) Water boiling in a pot
C. (1) Ice cream melting
D. (1) Ice forming in a freezer
E. (2) Cutting dough into strips
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Chemical Properties
Chemical properties describe
the ability of a substance• To interact with other
substances.• To change into a new
substance.
Example:
Iron has the ability to form rust
when exposed to oxygen.
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Learning Check
Classify each of the following properties as physical or chemical:
A. Ice melts in the sun
B. Copper is a shiny metal
C. Paper can burn
D. A silver knife can tarnish
E. A magnet removes iron particles
from a mixture
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SolutionClassify each of the following properties as
physical or chemical:
A. Ice melts in the sun (physical)
B. Copper is a shiny metal (physical)
C. Paper can burn (chemical)
D. A silver knife can tarnish (chemical)
E. A magnet removes iron particles
from a mixture (physical)
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Chemical Change
In a chemical change, a new
substance forms that has• A new composition• New chemical properties• New physical properties
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Some Chemical Changes
Silver tarnishes Shiny metal reacts to form black, grainy coating.
Wood burns A piece of wood burns with a bright flame to form ash, carbon dioxide, water vapor, and heat.
Iron rusts A shiny nail combines with oxygen to form orange-red rust.
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Classify each of the following changes as physical or chemical
A. Burning a candle.
B. Ice melting on the street.
C. Toasting a marshmallow.
D. Cutting a pizza.
E. Iron rusting in an old car
Learning Check
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Classify each of the following changes as physical or chemical
A. Burning a candle. (chemical)
B. Ice melting on the street. (physical)
C. Toasting a marshmallow. (chemical)
D. Cutting a pizza. (physical)
E. Iron rusting in an old car. (chemical)
Solution