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Chem Catalyst. Balance the following: Cu (s) + S (s)  Cu 2 S (s) Be (s) + O 2 (g)  BeO (s) K (s) + Cl 2 (g)  KCl (s) 2) What do these equations have in common?. Today’s Agenda:. Catalyst Notes: Types of Chemical Reactions Reaction analogies P. 339 #24.

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Chem catalyst
Chem Catalyst

  • Balance the following:

    Cu(s) + S(s) Cu2S(s)

    Be(s)+ O2(g) BeO(s)

    K(s) + Cl2(g)  KCl(s)

    2) What do these equations have in common?


Today s agenda
Today’s Agenda:

  • Catalyst

  • Notes: Types of Chemical Reactions

  • Reaction analogies

  • P. 339 #24


Unit 5 chemical reactions big questions
Unit 5: Chemical Reactions BIG Questions

  • How does a chemical equation represent a chemical reaction?

  • Why do chemical reactions occur?

  • Why is balance essential when working with chemical reactions?


Combination synthesis
Combination (Synthesis)

  • Two or more substances combine to form a single compound

  • A + B  AB

  • 2 Reactants, 1 Product

  • Ex: 2 Zn + O2  2 ZnO


Decomposition reaction
Decomposition Reaction

  • A single compound splits into two (or more) substances

  • XY  X + Y

  • 1 Reactant, 2 Products

  • Ex: 2HgO (s)  2Hg(l) + O2(g)


Single replacement reaction
Single-Replacement Reaction

  • An element replaces one of the ions in an ionic compound

  • A + BC  AC + B

  • 2 Reactants, 2 Products

  • Ex: Cu(s) + AgNO3(aq) Ag(s)+ CuNO3(aq)


Double replacement reaction
Double-Replacement Reaction

  • Ionic compounds exchange cations to form new ionic compounds

  • AB + XY  AY + XB

  • 2 Reactants, 2 Products

  • Ex: FeCl3 + 3 NaOH Fe(OH)3 + 3 NaCl


Combustion
Combustion

  • A hydrocarbon reacts with oxygen to form carbon dioxide and water

  • CxHyOz + O2 CO2 + H2O

  • 2 Reactants (hydrocarbon & O2), 2 Products (CO2, H2O)

  • Ex: C2H5O (l) + O2 (g) CO2 (g) + H2O (l)


Examples
Examples:

2 C8H18(l) + 25 O2 (g) 16 CO2 (g) + 18 H2O (l)

2HgO(s) 2Hg(l)+ O2(g)

CaI2 + Hg(NO3)2 HgI2+ Ca(NO3)2

2Mg + O2  2MgO

Fe(s) + Pb(NO3)2(aq)Pb(s) + Fe(NO3)2(aq)


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