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Le Chatelier's Principle: Changing Concentration02:27

Le Chatelier's Principle: Changing Concentration

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A system at equilibrium is in a state of dynamic balance, with forward and reverse reactions taking place at equal rates. If an equilibrium system is subjected to a change in conditions that affects these reaction rates differently (a stress), then the rates are no longer equal and the system is not at equilibrium. The system will subsequently experience a net reaction in the direction of a greater rate (a shift) that will re-establish the equilibrium. This phenomenon is summarized by Le...
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Le Chatelier's Principle: Changing Temperature02:19

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Consistent with the law of mass action, an equilibrium stressed by a change in concentration will shift to re-establish equilibrium without any change in the value of the equilibrium constant, K. When an equilibrium shifts in response to a temperature change, however, it is re-established with a different relative composition that exhibits a different value for the equilibrium constant.
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Entropy Change in Reversible Processes01:10

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In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
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Proofreading01:31

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Synthesis of new DNA molecules is carried out by the enzyme DNA polymerase, which adds nucleotides on the daughter strand complementary to the template DNA strand. DNA polymerase has a higher affinity to add the correct base and ensures fidelity during DNA replication. Furthermore,  it exhibits proofreading activity during replication, using an exonuclease domain that cuts off incorrect nucleotides from the nascent DNA strand.
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Entropy is a state function, so the standard entropy change for a chemical reaction (ΔS°rxn) can be calculated from the difference in standard entropy between the products and the reactants.
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Corrigendum: Change, change, change.

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    Summary
    This summary is machine-generated.

    This study corrects a previous publication. The correction ensures the accuracy of scientific records and aids future research endeavors.

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    Area of Science:

    • Scientific communication
    • Publication ethics

    Context:

    • Correction of a previously published article.
    • Ensuring data integrity in scientific literature.

    Purpose:

    • To rectify an error in the original publication.
    • To maintain the accuracy and reliability of scientific records.

    Summary:

    • A specific correction is being made to an article published in Volume 6.
    • The correction pertains to information presented on page 85.

    Impact:

    • Enhances the credibility of the scientific record.
    • Prevents the propagation of misinformation.
    • Supports accurate citation and future research based on corrected data.