3/23/15 1 Types of Reactions (7.2) Classifying Reactions • Reactions are often classified by the type of reactant or the number of reactants and products • Each type of reaction describes a different way in which reactants interact to form products Synthesis Reactions • Two or more substances react to produce a single product • A + B --> AB • Can occur between two elements: 2Na (s) + Cl 2 (g) --> 2NaCl (s) • Can occur between two compounds: CaO (s) + H 2 O (l) --> Ca(OH) 2 (s) • Can occur between a compound and an element: 2SO 2 (g) + O 2 (g) --> 2SO 3 (g) Combustion Reactions • When oxygen combines with another substance and releases energy in the form of heat and light
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Reactions are often classified by the Reactions (7.2)
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Types of Reactions���
(7.2)
Classifying Reactions • Reactions are often classified by the
type of reactant or the number of reactants and products
• Each type of reaction describes a different way in which reactants interact to form products
Synthesis Reactions
• Two or more substances react to produce a single product
• A + B --> AB
• Can occur between two elements: 2Na (s) + Cl2 (g) --> 2NaCl (s)
• Can occur between two compounds: CaO (s) + H2O (l) --> Ca(OH)2 (s)
• Can occur between a compound and an element: 2SO2 (g) + O2 (g) --> 2SO3 (g)
Combustion Reactions • When oxygen combines with
another substance and releases energy in the form of heat and light
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• Example - burning of coal: C (s) + O2 (g) --> CO2 (g)
Decomposition Reactions • When a single compound breaks
down into two or more elements or new compounds
• Often requires an energy source such as heat, light, or electricity to occur
• AB --> A + B • Example: NH4NO3 (s) --> N2O (g) + 2H2O (g)
Decomposition Reaction Example Single Replacement Reactions
• The atoms of one element replace the atoms of another element in a compound
• A + BX --> AX + B
• Three types of single replacement reactions
1. Metal replacing hydrogen: 2Li (s) + 2H2O (l) --> 2LiOH (aq) + H2 (g)
2. Metal replacing another metal:
Cu(s) + 2AgNO3(aq) --> Cu(NO3)2(aq) + 2Ag(s)
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3. Non-metal replacing another non-metal:
F2 (g) + 2NaBr (aq) --> 2NaF (aq) + Br2 (l)
Double Replacement Reactions
• Involves the exchange of ions between two compounds