CHARACTERISTIC OF CHEMISTRY REACTION

1. Color changes occur
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.