Cause and effect of chemical reactions

Factors of chemical reaction Can be caused by several things:

A. Happened by burning

B. Mixing of substances

C. Occurred due to electricity

A.    Chemical reactions Occur due to burning

For burning without external ignition, see spontaneous combustion. For vehicle engines, see internal combustion engine.

Fire generated from combustion fuel

Burning 'is a sequence of chemical reactions between a fuel and an oxidant, accompanied by the occasional heat production accompanied by light in the form of a fluorescent or flame.

In a complete combustion reaction, a compound reacts with an oxidizing agent, and the product is a compound of each element in the fuel with the oxidizing agent. Example:

The standard reaction enthalpy for combustion of methane at 298.15 K and 1 atm is -802 kJ / mol.

Another example:

A simpler example can be observed in combustion of hydrogen and oxygen, which is a common reaction used in rocket engines, which produce only water vapor, with a standard enthalpy reaction at 298.15 K and 1 atm being -242 kJ / mol.

In the majority of daily burning, oxygen (O2) oxygen is obtained from ambient air and resultant gas (flue gas, flue gas) from combustion will contain nitrogen:

As can be seen, if air is the source of oxygen, nitrogen covers a very large part of the resulting chimney gas.

In reality, the burning process is never perfect. In a flue gas from carbon burning (as in coal combustion) or carbon compounds (such as in combustion of hydrocarbons, wood, etc.) will be found in both unburned carbon and carbon (CO and other) compounds. If combustion at high temperatures using air (containing 78% nitrogen), then a small amount of nitrogen will react to various types of harmful nitrogen oxides (NOx)...

b.     Chemical reactions occur due to mixing of substances

Chemical reactions can also occur due to mixing of two or more substances that produce new substances. as an example :

C.    Chemical reactions Occur due to the flow of electricity

Giving an electric current to a substance may change the properties of the substance temporarily or permanently. Some substances can decompose if the flow of electricity. This process is called electrolysis. For example, water electrolysis. Water when powered by an electric current in the electrolysis will decompose into oxygen and hydrogen gas.

Chemical reactions through the electrolysis process in everyday life for example the process of copper plating of copper by gold or silver. This process is known as electro