slide 1 of 26 chemistry. © copyright pearson prentice hall slide 2 of 26 properties of matter >...
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Slide 1 of 26
Chemistry
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Slide 2 of 26
Properties of Matter > Describing Matter
Properties can be classified as:
a. Physical: malleability, conductivity, density, color, odor, volume, mass, etc…
b. Chemical: flammability, reactivity.
2.1
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Slide 3 of 26
Properties of Matter > Describing Matter
a. Extensive: a property that depends on the amount of matter in a sample
b. Intensive: a property that depends on the type of matter in a sample.
Physical Properties can be classified as:
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Slide 4 of 26
Properties of Matter > Describing Matter
Properties
Physical Chemical
Intensive Extensive Flammability & Reactivity
Color,Odor,Density Mass,Volume,Length
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Properties of Matter > Describing Matter
Extensive Properties Examples
•Mass
•Volume
•Weight
•Length
2.1
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Slide 6 of 26
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Properties of Matter > Describing Matter
Intensive Properties Examples
•Hardness
•Color
•Density
•Boiling/Melting Point
•Odor
2.1
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Properties of Matter >
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Identifying Substances
Identifying Substances
Do all samples of a substance have the same intensive properties?
2.1
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Properties of Matter > Identifying Substances
Matter that has a uniform and definite composition is called a substance.
2.1
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Properties of Matter > Identifying Substances
This sculpture of a falcon is made of gold. Gold is an example of a substance.
2.1
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Properties of Matter > Identifying Substances
Every sample of a given substance has identical intensive properties because every sample has the same composition.
Examples: elements and compounds
2.1
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Properties of Matter > Identifying Substances
A physical property is a quality or condition of a substance that can be observed or measured without changing the substance’s composition.
Hardness, color, conductivity, and malleability are examples of physical properties.
2.1
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Slide 12 of 26
Properties of Matter > States of Matter
Three commonly discussed states of matter are solid, liquid, and gas.
(others: Plasma, Bose Einstein Condensate)
2.1
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Properties of Matter > States of Matter
Solids
A solid is a form of matter that has a definite shape and volume.
2.1
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Slide 14 of 26
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Properties of Matter > States of Matter
Liquid
A liquid is a form of matter that has an indefinite shape, flows, yet has a fixed volume.
2.1
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Properties of Matter > States of Matter
Gases
A gas is a form of matter that takes both the shape and volume of its container.
(indefinite shape and volume)
2.1
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Properties of Matter > States of Matter
Vapor describes the gaseous state of a substance that is generally a liquid or solid at room temperature, as in water vapor.
2.1
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Properties of Matter >
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Physical Changes
Physical Changes
How can physical changes be classified?
2.1
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Properties of Matter > Physical Changes
During a physical change, some properties of a material change, but the composition of the material does not change.
As gallium melts in a person’s hand, the shape of the sample changes, but the composition of the material does not change.
2.1
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Properties of Matter > Physical Changes
Physical changes can be classified as reversible or irreversible.
• All physical changes that involve a change from one state to another are reversible (evaporation, condensation, etc...)
• Cutting hair, filing nails, and cracking an egg are examples of irreversible physical changes.
2.1
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Slide 20 of 26
Section Quiz
-or-Continue to: Launch:
Assess students’ understanding of the concepts in Section
2.1 Section Quiz.
2.1.
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Slide 21 of 26
1. Which of the following would be described as an extensive property of matter?
a. temperature
b. color
c. mass
d. hardness
2.1 Section Quiz.
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Slide 22 of 26
2.1 Section Quiz.
2. Which properties can be observed without changing the composition of a substance?
a. all properties of a substance
b. intensive properties
c. chemical properties
d. physical properties
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Slide 23 of 26
2.1 Section Quiz.
3. Match the states of matter with the following descriptions:
(1) takes the volume and shape of its container
(2) has a definite shape and volume
(3) has a definite volume but an indefinite shape
a. (1) liquid, (2) solid and (3) gas
b. (1) gas, (2) solid, and (3) liquid
c. (1) gas, (2) liquid, and (3) solid
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