Types of Reactions

Types of Reactions

Single    Displacement    –    one    element    displaced Most Metals + Water -> Metal Hydroxide + Hydrogen Gas Most Metals + Acid -> Metal Salt + Hydrogen Gas e.g.

Cu + HCl -> CuCl2 + 2H

A  + BC  à A       +  B

Double Displacement – two elements displaced Acid + Base -> Salt + Water e.g.

2KI + Pb(NO3)2 ->PbI2 + 2KNO3

AB  +     CD        ->   CB  +  AD

Synthesis – two elements combine to form one compound Most Metals + Oxygen Gas -> Metal Oxides e.g.

2Mg + O2 ->2MgO

A    +  B  -> AB

Decomposition – one compound becomes two (breaks apart/decompose) Most    Metal    Hydroxides   ->     Metal    Oxide    +    Water    Liquid Most Metal Nitrates -> Metal Oxide + Nitrogen Dioxide Gas + Oxygen Gas Group One Metal Nitrates -> Group 1 Metal Nitrate + Oxygen Gas Most Metal Carbonates -> Metal Oxide + Carbon Dioxide Gas e.g.

CuCO3  ->    CuO + CO2

AB    ->      A     + B

Combustion – oxygen combines with another compound to form water and CO2 Organic Molecule + excess Oxygen Gas -> Carbon Dioxide + Water e.g.

C10H8 + 12 O2    ->    10 CO2 + 4 H2O

AB   +    C        ->     AC     +    BC