Elements

Element: Are a pure substance and its represented by a symbol. A type of atom that is distinguished by its atomic number; that is, by the number of protons in its nucleus. The term is also used to refer to a pure chemical substance composed of atoms with the same number of protons.
Compound: when 2 o more elements are join together. is a substance consisting of two or more different elementschemically bonded together in a fixed proportion by mass

Classification of chemical reaction.
Decomposition is a reaction which a single compound decomposes to 2 or more other substances. Refers to the reduction of the body of a formerly living organism into simpler forms of matter. The body of a living organism begins to decompose (as part of a succession) shortly after death.
A combinationreaction which 2 substances combine to form a third.
A single replacement is a reaction in which an element ready with a compound and replaces another element.
A double- replacement is a reaction in which there is an exchange of positive ions between two compounds.
Combustion- reaction is when substances react with oxygen, usually with the rapid release of heat and the production of a flame.Synthesis: when 2 substances could be element or compound get together to form a more complex compound always a compound.
Example:
A + B  AB

Decomposition: the opposite of the synthesis.
Example:
A+BC C + BA

Single displacement: when a neutral element becomes a unique that complements an other.
Example:
AB+CD AC+BC

Double Displacements: patterns who change a couple.
Example:AB+CDAC+BC

Combustion: when an organic compound as burned hydrocarbon. Is a complex sequence of exothermic chemical reactions between a fuel and an oxidant accompanied by the production of heat or both heat and light in the form of either a glow or flames.

Neutralization: is the reaction of a base and a obtain salt and water. a chemical reaction, also called a water forming reaction, inwhich an acid and a base or alkali (soluble base) react and produce a salt and water solution (H2O). In other words, it can be said that neutralization is the combination of hydrogen ions H+ and hydroxide ions OH− (or oxide ions O2−) to form water molecule H2O. In the process, a salt is formed. In the process of neutralization a proton (usually hydrogen) is transferred. An acid is a proton donor,while a base is a proton receiver. H2O can act as either an acid or a base, depending on whether it comes in contact with an acid or a base; it takes the opposite form. Neutralization is generally exothermic, meaning it produces heat. One example of an endothermic neutralization is that of baking soda and vinegar (or other weak acids).
Oxidation: when an element lost electrons or gain the number ofoxidation. Oxidation is the interaction between oxygen molecules and all the different substances they may contact, from metal to living tissue. Sometimes oxidation is not such a bad thing, as in the formation of super-durable anodized aluminum.
Reduction: when lost the number of oxidation because it gains electrons. describes all chemical reactions in which atoms have their oxidation number(oxidation state) changed.
This can be either a simple redox process such as the oxidation of carbon to yield carbon dioxide, or the reduction of carbon by hydrogen to yield methane (CH4), or it can be a complex process such as the oxidation of sugar in the human body through a series of very complex electron transfer processes.

Reaction of redox: when it make the oxidation and reduction by thesimultaneous way.

The oxidation numbers of an atom in a neutral molecule must add up to zero.

If an atom of molecule is ionic its oxidation number equal to +1 within compound.

Al Kali earth atoms (group) have an oxidation number of +2 within compounds.

Fluorine always has a -1 oxidation number within compound.

All halogens (besides fluorine) have a -1 oxidation number in compound,...