L.+Jaho+Reaction+Teaching+Wiki+2008

__FIVE types of chemical ractions__

1.**synthesis** 2.**combuction** 3.**decomposition** 4.**single displacement** 5.**double displacement**

In synthesis two __atoms__ or __compounds__ combine to form 1 compound. In combustion, a hydrocarbon & oxygen, make water and CO2 (carbon dioxide) and let out heat/light. In decomposition, a compound breaks down to two compounds / atoms. With single displacement, one atom replaces an atom within a compound and in double displacement, two atoms in compounds switch places.

Generic Form: A+B->AB Magnesium and oxygen combine to form magnesium oxide. (Magnesium is Mg and Oxygen is O. Mg+O) Mg+O2->MgO NOW...balance; __1__ Mg __1 2__ O __1__ it isnt equal so we use coefficiants and put a 2 in front of the Mg on the right side of the equation. This will create O2 in the product. Mg+O2->2MgO But now we also have to place a 2 in front of the Mg on the left side of the equation to have Mg2 on both sides. This gives us our final result. 2Mg+O2->2MgO THERE YOU GO. //__**Decomposition**__//: 1 compound breaks down into two compounds/atoms; Generic form is AB->A+B. Water breaks down into hydrogen + oxygen. In making this equation write (H2O) followed by an arrow. Hydrogen + oxygen are the products and must be writen right after the arrow. [H2O->H2+O2]. To Balance: __2__ **H** __2__ __1__ **O** __2__ you have to double the reactants with a coefficient. __4__ **H** __2 2__ **O** __2__ Now double the hydrogen on the product side, because it has to eb increased. __4__ **H** __4__ __2__ **O** __2__ 2(H2O)->2(H2)+O2 THERE YOU GO. The generic form is A+BC->AC+B. An example is copper sulfate reacting with iron making iron sulfate + copper. We have to balance this, here we go Cu2(SO4)+Fe->Fe2(SO4)+Cu __2__ **Cu** __1 1__ **(SO4)** __1__ __1__ **Fe** __2__
 * __//Sinthesis://__**
 * //__Single Displacement:__//**

as you can see the copper on the product side isn't equal to the reactant. Lets double teh copper! Cu2(SO4)+Fe->Fe2(SO4)+//2//(Cu) __2__ **Cu** __2__ __1__ **(SO4)** __1__ __1__ **Fe** __2__ Now its Irons turn... Cu2(SO4)+2(Fe)->Fe2(SO4)+2(Cu) __2__ **Cu** __2__ __1__ **(SO4)** __1__ __2__ **Fe** __2__

THERE YOU GO. __**Double Displacement:**__ Generic form:AB+CD=CB+AD. silver nitrate + sodium chloride combine to make sodium nitrate + silver chloride. now make it into a sentance.--> Ag(NO3)+NaCl->Na(NO3)+AgCl. ( already balanced ) THERE YOU GO. __**// Combustion//**__: The generic form of this reaction: A+O2--->A2O+CO2

An example of this reaction is methane + oxygen gas react to produce Carbon dioxide and water. Methane=CH4 CH4+O2---> CO2+H2O Now Balance... it is not equal so we have to add coefficiants. CH4+2O2--->CO2+2H2O THERE YOU GO.