| 单词 | equilibrium constant |
| 例句 | The equilibrium constant is seen to be a mathematical function of the rate constants for the forward and reverse reactions. Chemistry 2019-02-14T00:00:00Z Dickson, A. G. & Millero, F. J. A comparison of the equilibrium constants for the dissociation of carbonic acid in seawater media. Carbon dioxide addition to coral reef waters suppresses net community calcification 2018-03-13T04:00:00Z Moreover, it can be shown that the state of the system can be determined when the equilibrium constants of all the electrolytes which are present in the common solution are known. Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 1 "Châtelet" to "Chicago" What is the value of the equilibrium constant KP for the vaporization equilibrium at 60 °C? Chemistry 2019-02-14T00:00:00Z The reaction quotient for mixture 2 is initially greater than the equilibrium constant, so this mixture will proceed in the reverse direction until equilibrium is established. Chemistry 2019-02-14T00:00:00Z For more complex reactions involving multistep reaction mechanisms, a similar but more complex mathematical relation exists between the equilibrium constant and the rate constants of the steps in the mechanism. Chemistry 2019-02-14T00:00:00Z The presence of catalyst lowers the activation energies of both the forward and reverse reactions but does not affect the value of the equilibrium constant. Chemistry 2019-02-14T00:00:00Z How must the concentration of NH3 change to reach equilibrium if the reaction quotient is less than the equilibrium constant? Chemistry 2019-02-14T00:00:00Z The extent of the water autoionization process is reflected in the value of its equilibrium constant, the ion-product constant for water, Kw: Chemistry 2019-02-14T00:00:00Z The slight ionization of pure water is reflected in the small value of the equilibrium constant; at 25 °C, Kw has a value of 1.0 10−14. Chemistry 2019-02-14T00:00:00Z Regardless of how complex the reaction may be, the temperature-dependence of its equilibrium constant persists. Chemistry 2019-02-14T00:00:00Z The relative strengths of acids may be quantified by measuring their equilibrium constants in aqueous solutions. Chemistry 2019-02-14T00:00:00Z The equilibrium constant for an acid is called the acid-ionization constant, Ka. Chemistry 2019-02-14T00:00:00Z Because the simplifying assumption is not valid for this system, the equilibrium constant expression is solved as follows: Chemistry 2019-02-14T00:00:00Z Thus, changing the amount of solid magnesium hydroxide in the mixture has no effect on the value of Q, and no shift is required to restore Q to the value of the equilibrium constant. Chemistry 2019-02-14T00:00:00Z What property of a reaction can we use to predict the effect of a change in temperature on the value of an equilibrium constant? Chemistry 2019-02-14T00:00:00Z Per the relation between equilibrium constants for reciprocal reactions described, the dissociation constant is the mathematical inverse of the formation constant, Kd = K –1. Chemistry 2019-02-14T00:00:00Z The equilibrium constant for this net reaction is much greater than the Ksp for calcium carbonate, indicating its solubility is markedly increased in acidic solutions. Chemistry 2019-02-14T00:00:00Z The constant value of Q exhibited by a system at equilibrium is called the equilibrium constant, K: Chemistry 2019-02-14T00:00:00Z Comparison of the data plots in Figure 13.5 shows that both experimental scenarios resulted in the same value for the equilibrium constant. Chemistry 2019-02-14T00:00:00Z Does the equilibrium constant for the reaction increase, decrease, or remain about the same as the temperature increases? Chemistry 2019-02-14T00:00:00Z What is the value of the equilibrium constant for the reaction? Chemistry 2019-02-14T00:00:00Z By its definition, the magnitude of an equilibrium constant explicitly reflects the composition of a reaction mixture at equilibrium, and it may be interpreted with regard to the extent of the forward reaction. Chemistry 2019-02-14T00:00:00Z The equilibrium constant for a reaction can be used to predict the behavior of mixtures containing its reactants and/or products. Chemistry 2019-02-14T00:00:00Z The reaction quotients for mixtures 1 and 3 are initially lesser than the reaction’s equilibrium constant, so each of these mixtures will experience a net forward reaction to achieve equilibrium. Chemistry 2019-02-14T00:00:00Z Which compound has the larger equilibrium constant for acid ionization? Chemistry 2019-02-14T00:00:00Z Changing the direction of a chemical equation essentially swaps the identities of “reactants” and “products,” and so the equilibrium constant for the reversed equation is simply the reciprocal of that for the forward equation. Chemistry 2019-02-14T00:00:00Z Changing the stoichiometric coefficients in an equation by some factor x results in an exponential change in the equilibrium constant by that same factor: Chemistry 2019-02-14T00:00:00Z Adding two or more equilibrium equations together yields an overall equation whose equilibrium constant is the mathematical product of the individual reaction’s K values: Chemistry 2019-02-14T00:00:00Z Comparing the equilibrium constant for the net reaction to those for the two coupled equilibrium reactions reveals the following relationship: Chemistry 2019-02-14T00:00:00Z What is the value of the equilibrium constant at 500 °C for the formation of NH3 according to the following equation? Chemistry 2019-02-14T00:00:00Z In this case, the change in volume results in a reaction quotient greater than the equilibrium constant, and so the equilibrium will shift left. Chemistry 2019-02-14T00:00:00Z Consequently, both forward and reverse reactions are accelerated, and equilibrium is achieved more quickly but without a change in the equilibrium constant. Chemistry 2019-02-14T00:00:00Z The value of the equilibrium constant for the reaction of hydrogen and iodine reacting to form hydrogen iodide is 50.5 under the given conditions. Chemistry 2019-02-14T00:00:00Z The ion product of water, Kw is the equilibrium constant for the autoionization reaction: Chemistry 2019-02-14T00:00:00Z Calculate the value of the equilibrium constant for the reaction. Chemistry 2019-02-14T00:00:00Z The equilibrium constant for the reaction between a metal ion and ligands produces a complex ion called a formation constant; for the reverse reaction, it is called a dissociation constant. Chemistry 2019-02-14T00:00:00Z Determine the equilibrium constant, KP, for this physical process. Chemistry 2019-02-14T00:00:00Z Recall that only gases and solutes are represented in equilibrium constant expressions, so the Ksp does not include a term for the undissolved AgCl. Chemistry 2019-02-14T00:00:00Z The very large equilibrium constant means the amount of the complex ion that will dissociate, x, will be very small. Chemistry 2019-02-14T00:00:00Z Determine the value of the equilibrium constant, KP, for the decomposition at 1274 K. Chemistry 2019-02-14T00:00:00Z This form of the equation provides a useful link between these two essential thermodynamic properties, and it can be used to derive equilibrium constants from standard free energy changes and vice versa. Chemistry 2019-02-14T00:00:00Z The relations between standard free energy changes and equilibrium constants are summarized in Table 16.4. Chemistry 2019-02-14T00:00:00Z The equilibrium constant for the reaction may then be derived from its standard free energy change: Chemistry 2019-02-14T00:00:00Z Determine the equilibrium constant at 25 °C and at 850 °C. Is the reaction spontaneous at either of these temperatures? Chemistry 2019-02-14T00:00:00Z What is the value of the equilibrium constant KP for the decomposition at this temperature? Chemistry 2019-02-14T00:00:00Z Use the data in Appendix L to calculate equilibrium constants for the following reactions. Chemistry 2019-02-14T00:00:00Z One such scale that is very popular for chemical concentrations and equilibrium constants is based on the p-function, defined as shown where “X” is the quantity of interest and “log” is the base-10 logarithm: Chemistry 2019-02-14T00:00:00Z Finally, calculate the value of the equilibrium constant using the data in the table: Chemistry 2019-02-14T00:00:00Z |
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