Types of Chemical Reactions

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Types of Chemical Reactions
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Combination/ Synthesis

• 2 or more substances combine to form one new
  substance
• Ex S O2 ? SO2
• SO3(g) H2O(l) ? H2SO4(aq)

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Decomposition Reaction

• A substance is broken down into two or more
  smaller substances.
• Ex CaCO3 ? CaO CO2
• 2H2O(l) ? 2H2(g) O2(g)

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Problems

• Predict the products for the following reactions.
• NiCO3 ? NiO ___
• Ag2O ? Ag(s) ___
• Ca S ?
• Fe O2 ?
• Mg O2 ?

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Single Replacement Reactions

• Where 1 element takes the place of another
  element in a molecule.
• General form of reaction
• 1. A BX ? AX B
• 2. AX Y ? AY X
• Ex 2Na(s) 2H2O(l) ? 2NaOH(aq) H2 (g)
• Cl2(g) 2KI(s) ? 2KCl(s) I2(g)

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Double Replacement Reaction

• Where the cations of two different molecules
  switch places to form two new molecules.
• Ex Ba(OH)2(aq) Na2SO4(aq) ? BaSO4(s)
  2NaOH(aq)
• NaOH(aq) HCl(aq) ? NaCl(aq) H2O(l)

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Combustion Reaction

• Where a substance is burned in the presence of
  oxygen to produce heat and usually light.
• There are 2 types
• Inorganic
• Organic
• 1

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• 1. Inorganic (no carbon)
• Ex 2Mg O2 ? 2MgO
• 2. Organic we use hydrocarbons
• (formed of C and H)
• Ex 2C6H6 15O2 ? 12CO2 6H2O
• Organic combustion always produces water and
  carbon dioxide, just balance out the equation!

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Sometimes there is heat!

• Thermal energy heat
• Heat may be a reactant or a product
• If heat leaves the reaction (exits) then it is
  exothermic. Hint the container feels hot
• Heat product because it was produced and
  released.

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• If the heat enters the reaction then it is
  endothermic. Hint the container feels cooler.
• Heat reactant because it was used up and taken
  away from the container

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Chemical Equations using heat

• Exothermic
• A B ? C D heat
• (hot to touch! Ouch!)
• Endothermic
• A B heat ? C D
• (cool to touch, brrrrr!)

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Practice for homework

• Review pg 302-303
• Questions 1-2,7,9,10 11
• Page 227-228 review how to name acids
• Do worksheet