Examinando por Autor "Lopez-Díaz, L. (Laura)"
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Publicación Acceso abierto Lección de Química # 10 Estequiometria(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)Chemical reactions are addressed by the amount of reactants in the reaction, if one reactant is completely consumed, the reaction is stopped, so this reagent is called Reagent limit. This method is widely used for the quantitative determination of unknown substances.Publicación Acceso abierto Lección de Química # 11 Termoquímica(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)Thermochemistry is the area of chemistry that studies chemical reactions that release energy or need. Calling endothermic the reactions that require energy and exothermic when the energy is released.Publicación Acceso abierto Lección de Química # 12 Termoquímica(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)Hess's law states that the enthalpy change in a chemical reaction will be the same if it is produced in one stage or in several stages.Publicación Acceso abierto Lección de Química # 13 Termoquímica(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)The probability of such particles are organized, molecules or atoms is known as entropy process, it also relates to the order of the chemical systems.Publicación Acceso abierto Lección de Química # 14 Termoquímica(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)Chemical reactions that produce or require energy to occur are studied by the branch of chemistry known as thermochemical, where the escaping heat in one reaction is quantified and working in enthalpic terms.Publicación Acceso abierto Lección de Química # 15 Equilibrio químico(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)Chemical equilibrium when the rate of reaction of a reactive product equals the reaction rate of reactive products.Publicación Acceso abierto Lección de Química # 16 Equilibrio químico(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)Chemical equilibrium when the rate of reaction of a reactive product equals the reaction rate of reactive products.Publicación Acceso abierto Lección de Química # 17 Equilibrio químico(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)In a chemical reaction when the concentrations of reactants and products do not change over time, is known as the chemical equilibrium, in this case the speed of forward and reverse reactions are the samePublicación Acceso abierto Lección de Química # 18 Equilibrio químico(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)The relationship between the concentrations of the reactants and products in an equilibrium reaction is known as equilibrium constant, in terms of concentrations is called Kc. And depending of the pressure in gaseous systems known as KpPublicación Acceso abierto Lección de Química # 19 Equilibrio químico(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)Reactions in balance may be disturbed such as changes of temperature, volume, quantity of substance or pressure. The reaction will try to redress the balance, this principle is known as the law of Le Chatelier.Publicación Acceso abierto Lección de Química # 2 Nomenclatura Inorgánica(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)Nomenclature hydracids acids which are formed by nonmetal and hydrogen, acids and oxyacids containing oxygen in their structure.Publicación Acceso abierto Lección de Química # 20 Reacciones ácido base(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)When some solids are mixed with water the following cases occur: if the substance is completely dissolved and conducts electricity this substance is classified as a strong electrolyte, if is partially dissolved and conducts electricity is called weak electrolyte, but in the case that is completely dissolved but does not lead is said that this substance is not an electrolyte.Publicación Acceso abierto Lección de Química # 21 Reacciones ácido base(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)Hydrolysis is a phenomenon that occurs when an ionic substance breaks his bond on contact with water.Publicación Acceso abierto Lección de Química # 22 Equilibrio iónico(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)weak acids and bases in aqueous solution present ion chemical balance and it is vital for many biological and industrial processes where water is used.Publicación Acceso abierto Lección de Química # 23 Equilibrio iónico(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)The buffer solutions are solutions with the ability to regulate a desired pH, for this process is important have an acid or a weak base, with its own counterion.Publicación Acceso abierto Lección de Química # 24 Reacciones ácido base(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)Gaseous detachment, precipitation, warming and color change, are evidence that there was a chemical change process, but some reactions do not generate such changes as is the case of an acid base reaction, in this case a third substance is added showing the chemical change. These substances are called chemical indicators or pH indicators.Publicación Acceso abierto Lección de Química # 25 Electroquímica(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)The electrochemical reactions are chemical reactions that need or produce electricity.Publicación Acceso abierto Lección de Química # 26 Electroquímica(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)The electrolytic cell is a device used for reactions that require electrical energy to occur.Publicación Acceso abierto Lección de Química # 27 Electroquímica(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)The Nernst equation is used when the electrochemical reactions do not occur in standard conditions. (25 ° C, 1 atm, 1M)Publicación Acceso abierto Lección de Química # 3 Reacciones químicas(2014-05-27) Lopez-Díaz, L. (Laura); Arango, S. (Sergio)nomenclature and assignment of oxidation numbers in compounds substances by systematic, stock and traditional methods.