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Synthesis Example: NaCl Na + Cl General: A + B AB
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Reaction Types
Chapter 6.2
Synthesis reactions combine substances
Example C + O2 CO2
OO C + O O C
OO COO C OO C OO C OO
C OO
C OO
CO
O
C OO
C O
O C O
O C OO C
OO C OO C
General: A + B AB
SynthesisExample: NaCl Na + Cl
General: A + B AB
Decomposition reactions break substances apartExample 2HgO 2 Hg + O2
O Hg
O Hg
Hg
O O Hg
+
General: AB A + B
Decomposition Examples• Digestion (breaking down food
molecules into simpler substances) • Electrolysis of water
– Electrolysis—the process by which an electric current is used to produce a chemical reaction
– 2H20 (with electricity) 2H2 + O2
Electrolysis of Water
In single displacement reactions, elements trade place!
Example: CuCl2 + Zn ZnCl2 + Cu
ZnClCl Cu +
General: AX + B BX + A
ClCl Zn Cu+
In double displacement reactions, ions are exchanged between compounds
Example: MgO + CaS MgS + CaO
General: AX + BY AY + BX
SOMg Ca+
O S
Mg Ca+
Combustion is a reaction involving oxygen, where heat is releasedExample: 2CH4 + 4O2 CO2 + 4H2O
Combustion products depend on the amount of
oxygen present• If not enough oxygen is present, a
combustion reaction may produce the toxic carbon monoxide as a product
• Example: 2CH4 + 3O2 CO + 4H2O
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