21'1 Classifying Reactions

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21.1 Classifying Reactions

• Chapter 21 Unit 7
• CPO Science
• Courtney Lewis
• Stapley Junior High School

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Symbols Meanings

• (s) solid
• (l) liquid
• (g) gas
• (aq) dissolved substance in solution

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Addition Reaction

• General A B ? AB
• Two or more compounds combine to become one
  compound
• Ex. 4Fe(s) 3O2(g) ? 2Fe2O3(s)

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Decomposition Reaction

• General AB ? A B
• A single compound breaks down into 2 or more
  compounds
• Ex. 2H2O(l) ? 2H2(g) O2(g)

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Single--Displacement

• General AX B ? BX A
• One element replaces a similar element in a
  compound
• Like One girl steals another girls boyfriend
• Ex. Fe(s) CuCl2(aq) ? FeCl2(aq) Cu(s)

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DoubleDisplacement Reaction

• General AB CD ? AD CB
• Ions in 2 compounds switch places
• Like 2 couples dancing and then they switch
  partners
• Ex. Pb(NO3)2(aq) 2KI(aq) ? PbI2(s) 2KNO3(aq)

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Combustion Reactions

• General
• Carbon Compound O2 ? CO2 H2O
• A substance combines with oxygen and releases
  energyBOOM!! Basically when something is burned
• Ex. CH4(g) O2(g) ? CO2(g) H2O(g)

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HOMEWORK

• Read 21.2 p. 381382
• Assignment 21.1 p. 383 Vocab Set 1 2 , Concept
  Review 14, Problems 14