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Types of Chemical Reactions

 

There are 4 types of inorganic reactions you need to know;

synthesis, decomposition, single and double replacement.

 

Synthesis-   A + B --> AB  (1 Product)

                 2Al + 3I2--> 2AlI3

Decomposition AB--> A + B  (1 Reactant)

                2H2O2 --> 2H2O + O2

Single Replacement A + BC --> AC + B  (an element replaces another and it is left all alone)

              2Mg + CO2--> 2MgO + C

Double Replacement (Metathesis)  AB + CD --> AD + CB (switch partners)

              AgNO3 + NaOH--> AgOH(s) + NaNO3

Hydrocarbon Combustion  CxHy + O2 --> X CO2 +1/2Y H2O

             Peroxyacetone + O2 --> CO2 + H2O

Past Regents Balancing Questions- Follow link for answers

June 2009-34 Given the balanced equation representing a reaction:
4Al(s) + 3O2(g)-->2Al2O3(s)
Which type of chemical reaction is represented by this equation?
(1) double replacement
(2) single replacement
(3) substitution
(4) synthesis

Jan 2004-38 Given the reaction:
Mg(s) + 2 AgNO3(aq)--> Mg(NO3)2(aq) + 2 Ag(s)
Which type of reaction is represented?
(1) single replacement       (3) synthesis
(2) double replacement     (4) decomposition

August 2005-38 Given the balanced equation:
AgNO3(aq) + NaCl(aq) ==> NaNO3(aq) + AgCl(s)
This reaction is classified as
(1) synthesis
(2) decomposition
(3) single replacement
(4) double replacement

Jan 2010-10 In which type of reaction do two or more substances combine to produce a single substance?
(1) synthesis
(2) decomposition
(3) single replacement
(4) double replacement

Aug 2009-35 Which equation represents a decomposition reaction?
(1) CaCO3(s) ==>CaO(s) + CO2(g)
(2) Cu(s) + 2AgNO3(aq)  ==>2Ag(s) + Cu(NO3)2(aq)
(3) 2H2(g) + O2(g)  ==>2H2O(l)
(4) KOH(aq) + HCl(aq)  ==>KCl(aq) + H2O(l)

 

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