O siłach napędowych w przyrodzie : koncepcje, interpretacje, nieporozumienia

• Autorzy: Orlik Marek

Identyfikatory

DOI

10.53584/wiadchem.2023.1.1

Warianty tytułu

EN

About driving forces in nature : concepts, interpretations and misunderstandings

• Języki publikacji: PL

Abstrakty

EN

Prepared for presentation within the Didactic Section of Polish Chemical Society, the study summarizes selected problems and concepts of teaching the basics of chemical reaction energetics as part of chemical undergraduate studies. The following problems are discussed: 1) indication of misunderstandings related to the definition of standard states in thermodynamics, with particular emphasis on the unfortunate assignment of the temperature of 298.15 K as "standard temperature", 2) problems with the interpretation of entropy as a "measure of disorder", with a recommendation regarding for understanding entropy as a measure of the number of ways to distribute the total energy of the system between the available degrees of freedom of motions, in terms of the quantum representation, i.e. the energy characteristics of a substance through sequences of energy levels, 3) a proposal to introduce the issue of thermodynamic driving forces of a chemical reaction based on the characteristics of the water evaporation process under different conditions, which favors the distinction of any reaction driving force from its standard driving force, as well as the distinction of such forces for isochoric and isobaric systems, both one- and multi-component, (4) the necessity to take into account the entropy of mixing of reagents to deepen the understanding of changes in the driving force of the reaction on the way to the state of chemical equilibrium, and 5) various interpretations of the influence of temperature on the equilibrium composition of the reacting system (Le Chatelier-Braun rule), with a recommendation for molecular interpretation, showing the role of differences in energies and sequences of energy levels of reactants and products for the value and direction of changes of the equilibrium constants of the reaction with temperature, taking into account also the principles of statistical thermodynamics. An additional aim of the article is to emphasize the importance of elementary mathematical education for mastering the basic laws governing the course of physicochemical processes, as well as for true understanding of chemistry, in general.

Słowa kluczowe

PL

termodynamika chemiczna; entropia; entalpia swobodna; energia swobodna Helmholtza; współrzędna reakcji; reguła Le Chateliera-Brauna

EN

chemical thermodynamics; entropy; free Gibbs energy; free Helmholtz energy; reaction coordinate; Le Chatelier-Braun principle

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Wiadomości Chemiczne
• Rocznik: 2023
• Tom: [Z] 77, 1-2
• Strony: 1--34
• Opis fizyczny: Bibliogr. 22 poz., tab., rys., wykr.

Twórcy

autor

Orlik Marek

• Uniwersytet Warszawski, Wydział Chemii, Pracownia Elektroanalizy i Elektrokatalizy Chemicznej Ul. Pasteura 1, 02-093 Warszawa

• https://orcid.org/0000-0002-1146-657

Bibliografia

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Uwagi

PL

Opracowanie rekordu ze środków MEiN, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2022-2023).