types of chemical reactions - mrs. greenwood's science...
TRANSCRIPT
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TYPES OF CHEMICALREACTIONS
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INDICATORS OF A REACTIONEmission of heatGiving off lightFormation of a precipitateFormation of a gasColor change
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TYPES OF CHEMICAL REACTIONS
There are 5 basic reaction types:
Synthesis or CombinationDecompositionSingle ReplacementDouble ReplacementCombustion
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SYNTHESIS REACTIONSOccurs when two substances (generally 2 different elements) combine and form a single new compound
General Formula:
A + B AB
Kind of like a celebrity marriage…
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Ben Affleck Jennifer Garner
+ = Bennifer
Kanye West Kim Kardashian
+ = Kimye
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Formation of a precipitate is an indication that a synthesis reaction has taken place
Example:
2 Mg (s) + O2 (g) 2 MgO (s)Magnesium Oxygen Magnesium Oxide
2 K (s) + Cl2 (g) 2 KCl (s)Potassium Chlorine Potassium Chloride
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DECOMPOSITION REACTIONSA single compound breaks down into two or more simpler products or elements.
General Formula
AB A + B
Kind of like a celebrity divorce/breakup…
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+Tom Cruise Katie Holmes
Tomkat =
+Ashmi =Ashton Kutcher Demi Moore
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+Rob Pattinson Kristen Stewart
Robsten =
+Jelena =Justin Bieber Selena Gomez
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Usually require energy in the form of heat, light, or electricity in order to occur
Example:
2 H2O (l) 2 H2 (g) + O2 (g)
H2CO3 (aq) 2 H2O (l) + CO2 (g)
Decomposition is the OPPOSITE reaction of Synthesis!
electricity
heat
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SINGLE-REPLACEMENTREACTION
Occurs when one element replaces another in a compound.
General Formula:
A + BC BA + C
In Hollywood, this usually takes placewhen you star in a movie with anextremely good looking costar…
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+
Brangelina + Jennifer Aniston
Brad & Jen + Angelina Jolie
+
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+
Katy & John + Russell Brand
Katy & Russ + John Mayer
+
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Generally occur when a ionic compound comes in contact with a more reactive metal or more reactive halogen.
Example:
2 K (s) + 2 H2O (l) 2 KOH (aq) + H2 (g)
2 HCl (aq) + F2 (g) 2 HF (aq) + Cl2 (g)
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DOUBLE-REPLACEMENTREACTION
Parts of two compounds switch places to form two new compounds
General Formula
AB + CD AD + CB
Think Hollywood spouse swap…
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+Justin Timberlake & Gerard Bulter &
Cameron Diaz + Jessica Biel
+Justin Timberlake & + Gerard Bulter &
Jessica Biel Cameron Diaz
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Generally take place in aqueous solutionOften produce a precipitate, gas, or molecular compound (H2O)
Example:
Na2S (aq) + Cd(NO3)2 (aq) CdS (s) + 2 NaNO3
(aq)
2 NaCN + H2SO4 (aq)2 HCN (g) + Na2SO4 (aq)
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COMBUSTION REACTIONSAn element or compound reacts with oxygen gas (O2)
Often produces energy in the form of heat and light
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Combustion of a hydrocarbon chain produces water and carbon dioxide
Example:
2 C4H8 (l) + 5 O2 (g) 3 CO2 (g) + 4 H2O (l)
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MAIN CONCEPTSSynthesis
TWO (or more) reactants combine to form ONE product
DecompositionONE reactant yields TWO (or more) products
Single-ReplacementONE element and ONE compound form ONE different element and ONE new compound.
Double-ReplacementTWO reactants yield TWO new products
CombustionReaction with oxygen gas and ALWAYS forms water and carbon dioxide