Show Cause And Effect

CAUSE AND EFFECT

Chemical reactions are said to or take place if one of the following things should be observed: they produce gas, sediment, temperature change and color change. Chemical reactions are a process whereby new substances, the reaction product, are formed from some of the original substances, called reactants. Usually a chemical reaction is accompanied by physical events, such as discoloration, sediment formation, or gas generation. Symbols expressing a chemical reaction are called chemical equations.

The characteristics of a chemical reaction are:

1. Color Changes occur
In chemical reactions, the reactants are converted into products. Changes that occur can be caused by the breaking of bonds antaratom reactants and the formation of bonds that bru make the product. To break the bond needed energy. To form a new bond, it releases some energy. Thus, in chemical reactions there is a change of energy.

The chemical reaction that produces energy in the form of heat is called an exothermic reaction. The reaction that absorbs heat energy is called the endothermic reaction.

Example: Fire can warm a cold body and when breathing heat exists in the body due to exercise is released so the body becomes cold.

2. Temperature Changes occur
In chemical reactions, the reactants are converted into products. Changes that occur can be caused by the breaking of bonds reagent antaratom and the formation of new bonds that make up the product. To break the bond needed energy.

Chemical reactions that produce energy in the form of heat are called exothermic reactions, while reactions that absorb heat energy are called endothermic reactions. Chemical reactions occur in a space we call dbngan system, where outside the system called the environment. In the exothermic reaction, there is transfer of heat energy from sisitem to the environment. At the endothermal reaction is the transfer of heat energy from the environment to the system.

3. Occurs Sediment Formation
When reacting two solutions in a test tube, it sometimes forms an insoluble, solid compound, separated from the solution. The solids are called sediments (precipitates).

Reactions that include examples of chemical reactions that produce precipitates include:
a. Occurrence of carbonate compounds at the bottom of the pan when boiling water.
b. When lime water is blown, there will be a reaction between lime water and carbon dioxide from the breath. The occurrence of the reaction can be observed the formation of white calcium carbonate (CaCO3) that settles on the bottom of the glass if left for a while.
c. Precipitation by chemical reactions has long been used for water purification processes. The muddy well water mixed with mud can be clarified with the addition of alum. Tawas will tie the particles of mud particles to clot and eventually settle.

4. Gas Formation occurs
Simply put, in the chemical reaction of the formed gas is indicated in the presence of bubbles in the reacted solution. The presence of gas can be known from its distinctive smell, such as sulfidic acid (H2S) and ammonia (NH3) that smells rotten.

In writing the equation of the reaction required three steps:
A. The names of reactants and reaction products are written, the result is called a equation called.Example: nitrogen oxide + oxygen → Nitrogen dioxide
B. As a substance name penggantin used chemical formulas.The result is called the frame equation.Example: No + O2 → No2
C. The skeletal equations are then in equilibrium, which results in a chemical equation. Example: 2No + O2 → 2No2

Types of chemical reactions:
A.Burning.
Burning is a reaction in which an element or compound with oxygen forms a simple oxygen-containing compound.
Example :
CO2, H2O and SO2
C3H8 (9) + 5O2 (9) → 3CO2 (9) + 4H2O (9)
2C6H14O4 (9) + 15O2 → 12Co2 (9) + 14H2O (9)

B.Collection (synthetic)
A reaction in which a more complex substance is formed from two or more simpler substances (both elements and compounds).
2H2 (9) + O2 → 2H2O (9)
CO (9) + 2H2 (9) → CH3OH (9)

C.Indoning
Is a reaction in which a substance is broken down into simpler substances 2Ag2O (p) → 4Ag (p) + O2 (9)

D.Changes (Shift date)
Is a reaction in which an element is transferred to another element in a compound. Cu (p) + 2Ag + (ag) CU2 + (ag) + 2 Ag (p)

E.Metatesis (transfer date)
Is a reaction where there is exchange between two reactions.
AgNo3 (ag) → NaCL (ag) → AgCL (p) + NaNO3 (ag)