CHEMICAL REACTION

The chemical reaction is a natural process that always results antarubahan chemical compounds. Compounds or compounds involved early in the reaction is referred to as reactants. Chemical reactions are usually characterized by a chemical change, and will result in one or more products which typically have characteristics different from the reactants. Classically, chemical reactions involve changes involving the movement of electrons in the formation and breaking of chemical bonds, although the general concept is basically a chemical reaction can also be applied to the transformation of elementary particles as in reaction reaction nuklir.persamaan used to describe chemical reactions.Equation consists of a chemical formula or formula structure of the reactants on the left and products on the right. Between products and reactants are separated by an arrow (→) which indicates the direction and type of reaction. The tip of the arrow indicates which direction the reaction moves. Double arrow (), which has two different ends of the arrow direction, used in chemical reaction equilibrium equation must be balanced, according to the stoichiometry, the number of atoms of each element on the left must equal the number of atoms of each element on the right. Balancing is done by adding the numbers in front of each molecular compound (denoted by A, B, C and D in the schematic diagram below) with small numbers (a, b, c and d) in front of him.
 A more complicated reaction scheme described by the reaction, the goal is to find compounds beginning or end, or also to show transisi.Beberapa phase chemical reactions can also be added to the writing on the mark his arrow; for example the addition of water, heat, illumination, catalysis, etc.. Also, some minor products can be placed below the arrow.

 An example of organic reactions: oxidation of ketones into esters with acid peroksikarboksilat rektrosintetik analysis can be used to design the synthesis of complex reactions. The analysis starts from the product, for example by breaking chemical bonds are chosen to be a new reagent. Special arrows (⇒) is used in the retro reaction.In a chemical reaction, reactants are converted into products. Changes that can occur due to the termination of the bonds antaratom reactants and formation of bonds that make up bru product. Energy required to decide ties. To form a new bond, release some energy.Thus, the chemical reaction energy changes.
Chemical reactions that produce energy in the form of heat is called exothermic reaction.Reactions that absorb heat energy is called endothermic reactions.
Example: Fire can warm the body when breathing cold and the heat released in the body due to exercise so the body becomes cold.
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2. Temperature changes occur
In a chemical reaction, reactants are converted into products. Changes that can occur due to the termination of the bonds antaratom reagents and formation of new bonds that form the product. Energy required to decide ties.
Chemical reactions that produce energy in the form of heat is called exothermic reactions, whereas reactions that absorb heat energy is called endothermic reactions.
Chemical reactions occur in a space that we call dbngan system, the place is called with the environment outside the system.
In exothermic reactions, heat transfer occurs from sisitem into the environment.
In endothermic reactions occur transfer heat energy from the environment to the system.
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3. The precipitate formation occurs
When the reaction of two solutions in a test tube, sometimes forming an insoluble sneyawa, solid, and separated from the solution. The solid is called the precipitate (precipitate)
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4. Gas formation occurs
Simply put, the chemical reaction of gas that is formed is shown by the presence of bubbles in the solution are reacted. The presence of gas can be known from the typical smell, such as acid sulfide (H2S) and ammonia (NH3), which stinks.