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Published byTodd Wilson Modified over 9 years ago
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Unit 3: Balancing Chemical Equations Section 3: Types of Chemical Reactions
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Types of Chemical Reactions Synthesis Decomposition Single-displacement (single-replacement) Double-displacement (double-replacement) Combustion
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Synthesis Two substances combine to form a compound – A + X AX “2 things become 1” Ex: 2 Mg + O 2 2 MgO
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Decomposition One compound breaks down into two different substances – AX A + X “1 thing breaks down into 2” Ex: 2 NaCl 2 Na + Cl 2
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Single-Displacement An element replaces a similarly charged element in a compound – A + BX AX + B Ex: 2 Na + MgCl 2 Mg + 2 NaCl “positive replaces positive” – Y + BX BY + X Ex: Cl 2 + 2 KBr Br 2 + 2 KCl “negative replaces negative”
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Double-Displacement Two original compounds form two new compounds – AX + BY AY + BX Ex: FeS + 2 HCl FeCl 2 + H 2 S
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Combustion A substance that combines with oxygen to form carbon dioxide and water – __?__ + O 2 CO 2 + H 2 O Ex: C 6 H 12 O 6 + O 2 CO 2 + H 2 O
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Practice Problems 1.N 2 + 3H 2 2NH 3 2.2KClO 3 2KCl + 3O 2 3.2H 2 + O 2 2H 2 O 4.C 3 H 8 + 5O 2 3CO 2 + 4H 2 O 5.FeCl 3 + 3NaOH Fe(OH) 3 + 3NaCl 6.2K + MgBr 2 2KBr + Mg 7.2AgNO 3 + MgCl 2 2AgCl + Mg(NO 3 ) 2
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