Physical and Chemical Changes

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Physical and Chemical Changes
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Changing Matter

• Matter can be changed two ways
• Physically
• Physical reaction
• Physical change
• Chemically
• Chemical reaction
• Chemical change

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Physical Changes

• Do NOT CHANGE THE TYPE OF MATTER
• Nothing new or different is formed
• Could be a change in
• Mass
• Volume
• Density
• Change in state
• Color
• Shape

Size
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Examples of Physical Changes

• Boiling
• Freezing
• Melting
• Breaking
• Tearing
• Changing the outer color

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Breaking
http//www.mshp.dps.missouri.gov/MSHPWeb/PatrolDiv
isions/CLD/TraceEvidence/Images/BrokenGlass2.jpg
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Tearing
http//www.scrapbooking101.net/articles/img/tearin
g-white.jpg
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MELTING
http//t4.jordan.k12.ut.us/grade_level/fifth/image
s/ice_melting.jpg
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BOILING
http//www.danielleblog.com/archives/boiling_over_
DSC_0122.jpg
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Superficial Color Change
http//www.theinsurancepolicy.com/uploads/house_pa
inting.jpg
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Chemical Changes

• Cant be reversed
• Result in the formation of a new substance
• Energy is absorbed or released
• The substance changes into a NEW substance

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RUSTING (Oxidation)
http//graphics.stanford.edu/courses/cs448c-00-fal
l/rust.jpg
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• Oxidation of copper

http//www.slateandcopper.com/images/metal-roofing
/metal-roofing-header.jpg
http//www.tourismjunction.com/images/statue-of-li
berty-ny.jpg
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BURNING
http//www.pueblo.gsa.gov/cfocus/cfextremecold07/w
oodburning.jpg

• http//search.viewpoint.com/pl/imgview?ret_queryk
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  e3.yt-thm-a01.yimg.com/image/25/m3/2450120735img
  http//d21c.com/Boca434/People/Burning-Food.gifrc
  http//d21c.com/Boca434/People

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COMBUSTION
http//www.ric.edu/faculty/ptiskus/chemical/
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Signs of A Chemical Change

• Please excuse coughs burps and sneezes
• P Precipitate forms
• E Energy is given off or absorbed
• C Color Change
• B Bubbles gas formation
• S - smell

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Precipitate

• A solid that forms from mixing two liquid
  solutions

Precipitate
http//www.ric.edu/faculty/ptiskus/chemical/
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Energy Given Off

• Observed as Heat or Light

http//static.howstuffworks.com/gif/light-stick-2.
jpg
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COLOR CHANGE

• http//www.ric.edu/faculty/ptiskus/chemical/

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Bubbles gas production
http//www.learner.org/channel/courses/essential/p
hysicalsci/images/s4.baking-soda-and-vinegar-.jpg
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Smells
http//protectingwater.com/images/dead_fish.jpg
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Atoms

• All matter is made of small particles called
  atoms
• Atoms can bond to form molecules
• May be the same type of atom or,
• Different types of atoms
• Different types of atoms ? compounds
• Same type of atoms ? substances

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Chemical Changes

• Atoms are re-arranged, NOT created or destroyed
• Law of Conservation of Matter
• Law of Conservation of Mass

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Chemical Changes

• Matter is conserved ? type of atoms does not
  change
• Nothing is created or destroyed
• Mass is conserved ? amount of atoms cannot change
• Nothing is created or destroyed