Types of Types of Reactions and Reactions and

Predicting Predicting ProductsProductsSNC2DSNC2D

Types of ReactionsTypes of Reactions

Reactions can be divided into 5 main Reactions can be divided into 5 main types:types:

SynthesisSynthesis DecompositionDecomposition Single Displacement/ReplacementSingle Displacement/Replacement Double Displacement/ReplacementDouble Displacement/Replacement NeutralisationNeutralisation

SynthesisSynthesis

Synthesis: 2 or more reactants Synthesis: 2 or more reactants combine to form 1 productcombine to form 1 product

SynthesisSynthesis

Synthesis: 2 or more reactants Synthesis: 2 or more reactants combine to form 1 productcombine to form 1 product

SynthesisSynthesis

Synthesis: 2 or more reactants Synthesis: 2 or more reactants combine to form 1 productcombine to form 1 product

e.g.e.g. Mg + OMg + O22 -> MgO -> MgO

SynthesisSynthesis

Synthesis: 2 or more reactants Synthesis: 2 or more reactants combine to form 1 productcombine to form 1 product

e.g. 2e.g. 2 Mg + OMg + O22 -> 2 MgO -> 2 MgO

SynthesisSynthesis

Synthesis: 2 or more reactants Synthesis: 2 or more reactants combine to form 1 productcombine to form 1 product

e.g. 2e.g. 2 Mg + OMg + O22 2 MgO 2 MgO

S + Zn S + Zn ZnS ZnS

DecompositionDecomposition

Decomposition: 1 reactant breaks Decomposition: 1 reactant breaks down into 2 or more productsdown into 2 or more products

DecompositionDecomposition

Decomposition: 1 reactant breaks Decomposition: 1 reactant breaks down into 2 or more productsdown into 2 or more products

e.g. e.g. HH22O O H H22 + O + O22

DecompositionDecomposition

Decomposition: 1 reactant breaks Decomposition: 1 reactant breaks down into 2 or more productsdown into 2 or more products

e.g. 2 He.g. 2 H22O O 2 H 2 H22 + O + O22

DecompositionDecomposition

Decomposition: 1 reactant breaks Decomposition: 1 reactant breaks down into 2 or more productsdown into 2 or more products

e.g. 2 He.g. 2 H22O O 2 H 2 H22 + O + O22

KClOKClO33 KCl + O KCl + O22

DecompositionDecomposition

Decomposition: 1 reactant breaks Decomposition: 1 reactant breaks down into 2 or more productsdown into 2 or more products

e.g. 2 He.g. 2 H22O O 2 H 2 H22 + O + O22

2 KClO2 KClO33 2 KCl + 3 O 2 KCl + 3 O22

Single DisplacementSingle Displacement

Single Displacement: a single element Single Displacement: a single element replaces another in a compoundreplaces another in a compound

Single DisplacementSingle Displacement

Single Displacement: a single element Single Displacement: a single element replaces another in a compoundreplaces another in a compound

e.g. MgBre.g. MgBr22 + Cl + Cl22 MgCl MgCl22 + Br + Br22

Negative ions replace negative ions!Negative ions replace negative ions!

Single DisplacementSingle Displacement

Single Displacement: a single element Single Displacement: a single element replaces another in a compoundreplaces another in a compound

e.g. Fe + CuSOe.g. Fe + CuSO44

Single DisplacementSingle Displacement

Single Displacement: a single element Single Displacement: a single element replaces another in a compoundreplaces another in a compound

e.g. Fe + CuSOe.g. Fe + CuSO44 Cu + FeSO Cu + FeSO44

And positive ions replace positive And positive ions replace positive ions!ions!

Double DisplacementDouble Displacement

Double Displacement: parts of two Double Displacement: parts of two compounds switch placescompounds switch places

Double DisplacementDouble Displacement

Double Displacement: parts of two Double Displacement: parts of two compounds switch placescompounds switch places

e.g. NaOH + FeCle.g. NaOH + FeCl33

Double DisplacementDouble Displacement

Double Displacement: parts of two Double Displacement: parts of two compounds switch placescompounds switch places

e.g. NaOH + FeCle.g. NaOH + FeCl33 Fe(OH) Fe(OH)33 + + NaClNaCl

Double DisplacementDouble Displacement

Double Displacement: parts of two Double Displacement: parts of two compounds switch placescompounds switch places

e.g. 3 NaOH + FeCle.g. 3 NaOH + FeCl33 Fe(OH) Fe(OH)33 + 3 + 3 NaClNaCl

Double DisplacementDouble Displacement

Double Displacement: parts of two Double Displacement: parts of two compounds switch placescompounds switch places

e.g. 3 NaOH + FeCle.g. 3 NaOH + FeCl33 Fe(OH) Fe(OH)33 + 3 + 3 NaClNaCl

Remember that positive ions pair with Remember that positive ions pair with negative ions.negative ions.

CombustionCombustion

And remember that there also exist And remember that there also exist combustion reactions:combustion reactions:

e.g. the combustion of hydrocarbons e.g. the combustion of hydrocarbons like methanelike methane

CHCH44 + O + O22 CO CO22 + H + H22OO