Chapter 2 Lesson 2 - Somerset Academy Canyons...Aug 09, 2019 · Chapter 2 Lesson 2...
Transcript of Chapter 2 Lesson 2 - Somerset Academy Canyons...Aug 09, 2019 · Chapter 2 Lesson 2...
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Chapter 2Lesson 2
Properties�of�Matter
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Physical Properties-Characteristics�that�can�be�observed�-�WITHOUT�changing�the�identity�of�the�substance
-Examples:�Color,�shape,�mass,�state�of�matter,�texture
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Physical Properties (continued)
-Many�physical�properties�remain�constant
-Therefore,�can�be�used�to�identify�substances
-Those�that�remain�constant�are�considered�Size-Independent
-Because�they�stay�the�same�regardless �of�their�size�(independent�of�their�size)�
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Melting Point-The�temperature�and�pressure�at�which�a�solid�becomes�a�liquid
-A�size-independent�property
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Boiling Point-The�temperature�and�pressure�at�which�a�liquid�becomes�a�gas
-Size-independent�
-Example:�Water�will�boil�at�the�same�temperature�whether�it’s�an�ounce�or�a�gallon�
-Solids�Melt�-�Liquids�Boil
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Density -Mass per unit volume of a substance
-The measure of how light or heavy an object is for its size
-Based on how heavy the individual atoms are
D = M/V (Mass divided by Volume)
-Typically measured in g/cm^3 (mass in grams, volume in cm -or- mL)
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Math Practice Problems - pg.54Copy�the�question �and�answer�in�your�notes.
1)A�piece�of�tin�has�a�mass�of�16.52�g�and�a�volume�2.26�cm^3.�What�is�the�density?�
2)A�man�has�a�50.0�cm^3�bottle�completely�filled�with�163�g�of�a�slimy,�green�liquid.�What�is�the�density�of�the�liquid?�
3)A�piece�of�metal�has�a�density�of�11.3�g/cm^3�and�a�volume�of�6.7�cm^3.�What�is�the�mass�of�this�piece�of�metal?�
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1)A�piece�of�tin�has�a�mass�of�16.52�g�and�a�volume�2.26�cm^3.�What�is�the�density?�
Mass�=�16.52�g
Volume�=�2.26�cm^3
Density�=�16.52/2.26�=�7.31�g/cm^3
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2)�A�man�has�a�50.0�cm^3�bottle�completely�filled�with�163�g�of�a�slimy,�green�liquid.�What�is�the�density�of�the�liquid?
Mass�=�163�g
Volume�=�50�cm^3
Density�=�163/50�=�3.26�g/cm^3
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3)�A�piece�of�metal�has�a�density�of�11.3�g/cm^3�and�a�volume�of�6.7�cm^3.�What�is�the�mass�of�this�piece�of�metal?�
Volume�=�6.7�cm^3
Density�=�11.3�g/cm^3
Mass�=�DV�=�11.3�x�6.7�=�75.71�g
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Which is more Dense?
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Volume-The�amount�of�space�an�object�occupies
-To�find�the�volume�of�a�regularly�shaped�object:
-Use�the�proper�formula�
-Ex:�Volume�of�a�rectangle�=�L�x�W�x�H
-To�find�the�volume�of�an�irregularly�shapedobject:
-Displacement�Method
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What is displacement?
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Juan!
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Chemical Properties-A�chemical�property�describes�how�a�substance�changes�into�a�new�substance
-Either�by�combining�with�other�elements�-or-�by�breaking�apart�into�new�substances
�
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Chemical Properties (continued) -Once it changes into that new substance it cannot change back
EX: Burning your paper -- turns it to ash -- cannot cool it down to turn it back to paper
-Flammability and ability to rust are also examples of chemical properties
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Reactivity -The�capacity�of�a�substance�to�combine�chemically�with�another�substance
-A�chemical�property
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Physical and Chemical Properties are Different-Physical�Properties
-Can�be�observed�WITHOUT�changing�the�identity�of�the�substance�
-Chemical�Properties
-Can�only�be�observed�in�situations�in�which�the�identity�(chemicals)�of�the�substance�changes
-Ability�to�change�into�something�new
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Density - DemoWhat�is�the�mass�of�the�purple�piece�of�play-doh?
What�is�the�mass�of�the�green�piece�of�play-doh?�
What�is�the�volume�of�the�purple�piece?�
What�is�the�volume�of�the�green�piece?�
Do�you�think�they�will�have�the�same�densities?�Why�or�why�not ?�
What�is�the�density�of�the�purple�piece?�
What�is�the�density�of�the�green�piece?�