What happens to water and limestone
The process by which molecules break down into atoms and atoms rearrange to form a new substance. In the reaction is often accompanied by light, heat, discoloration, sediment, etc., to determine whether a reaction is based on the chemical reaction is the reaction of the formation of new substances.The process of the formation of old chemical bonds and the formation of new chemical bonds.In the reaction is often accompanied by light, heat, color, sediment, etc.. The basis for judging whether a reaction is a chemical reaction is whether the reaction generates a new substance. According to the chemical bond theory, it can be judged whether the chemical reaction is based on the fracture of the old bond and the formation of the new bond.
Chemical reactions between water and limestone (calcium carbonate).Two principles should pay attention to the writing of chemical formula: one must be based on objective facts, never imagined substances and chemical reactions, coined in fact does not exist; the two is to obey the law of conservation of mass, must be equal to the number and species of atoms on both sides of the sign.
Heat release, heat absorption, luminescence, color change, precipitation, gas generation.Reversible and spontaneous reactions:Each chemical reaction is a reversible reaction. In a positive reaction, the conversion of a substance from a reactant to a product. The reverse reaction is reversed, and the product is converted into a reactant.The reaction rate and the reverse reaction rate are equal, so the reactants and products will exist. However, the equilibrium state of the reaction can be changed by changing the reaction state, such as temperature or pressure. This is le Chatelier's principle used to predict product or reactant formation.Although all reactions are reversible in some ranges, partial reactions can be classified as irreversible reactions. "Irreversible reaction" means "complete response". Almost all of the reactants are products, even in extreme conditions are difficult to reverse reaction.Another mechanism, called the spontaneous reaction, is a thermodynamic tendency to represent a net increase in the entropy of the reaction. Spontaneous reactions (relative to non spontaneous reactions) do not require external assistance, such as energy supply. In the system of chemical equilibrium, the direction of spontaneous reaction can be expected to form more substances.In organic chemistry class more, free radical reaction, ionic reaction; electrophilic reaction, nucleophilic reaction; nitration, halogenation, sulfonation, amination, acylation, cyanation reaction, addition reaction, elimination, substitution, addition polymerization, condensation reaction.
