Results 21 to 30 of about 4,964,055 (321)

Reações ácido-base: conceito, representação e generalização a partir das energias envolvidas nas transformações

open access: yesQuímica Nova, 2012
Undergraduate students on the first year of Chemistry Courses are unfamiliar with the representation of acid-base reactions using the ionic equation H+ + OH- → H2O.
Iêda Aparecida Pastre   +4 more
doaj   +1 more source

Exploiting Network Topology for Accelerated Bayesian Inference of Grain Surface Reaction Networks [PDF]

open access: yes, 2020
In the study of grain-surface chemistry in the interstellar medium, there exists much uncertainty regarding the reaction mechanisms with few constraints on the abundances of grain-surface molecules. Bayesian inference can be performed to determine the likely reaction rates.
arxiv   +1 more source

YÜKSEK DERİŞİMDE FOSFORÖZ ASİTTEN POTASYUM FOSFİT TUZLARI ÜRETİMİNDE REAKTÖR İŞLETİM TÜRÜNÜN ETKİSİ

open access: yesEskişehir Osmangazi Üniversitesi Mühendislik ve Mimarlık Fakültesi Dergisi, 2021
In the production of potassium phosphite salts (monopotassium phosphite and dipotassium phosphite salts) formed as a result of the neutralization reaction of phosphorous acid and potassium hydroxide.
Zeynep YILMAZER HİTİT   +5 more
doaj   +1 more source

The Rapid Exfoliation and Subsequent Restacking of Layered Titanates Driven by an Acid-Base Reaction.

open access: yesAngewandte Chemie, 2015
Two-dimensional (2D) (hydro)oxide materials, that is, nanosheets, enable the preparation of advanced 2D materials and devices. The general synthesis route of nanosheets involves exfoliating layered metal (hydro)oxide crystals. This exfoliation process is
Huiyu Yuan   +3 more
semanticscholar   +1 more source

Innovative cycling reaction mechanisms of CO2 absorption in amino acid salt solvents

open access: yesChemical Engineering Journal Advances, 2022
Amino acid salt (AAS) solvents with equimolar base (used to obtain the salt) to amino acid (AA) have been well studied for CO2 absorption, however, very little is known about the reactions when more base is applied.
Zhenghong Bao   +7 more
doaj  

Synthesis of new annulated pyrano[2,3-d]pyrimidine derivatives using organo catalyst (DABCO) in aqueous media

open access: yesJournal of Saudi Chemical Society, 2017
A selective method for the synthesis of annulated pyrano[2,3-d]pyrimidines has been developed. It was shown that base catalysis is more efficient in this reaction, rather than acid catalysis as it is believed that 1,4-diazabicyclo[2.2.2]octane (DABCO) is
Ajmal R. Bhat   +2 more
doaj   +1 more source

Developing and evaluating a multiple-choice knowledge test about Brønsted-Lowry acid-base reactions for upper secondary school students

open access: yesChemistry Teacher International, 2023
For centuries, chemists have researched acid-base reactions and developing numerous different acid-base concepts. Consequentially, it is difficult to teach about acid-base reactions in a clear and conceptually coherent manner.
Krebs Rita Elisabeth   +2 more
doaj   +1 more source

Exploiting product molecule number to consider reaction rate fluctuation in elementary reactions [PDF]

open access: yes, 2019
In many chemical reactions, reaction rate fluctuation is inevitable. Reaction rates are different whenever chemical reaction occurs due to their dependence on the number of reaction events or the product number. As such, understanding the impact of rate fluctuation on product number counting statistics is of the utmost importance when developing a ...
arxiv   +1 more source

Modelling Chemical Reasoning to Predict Reactions [PDF]

open access: yesChem. Eur. J. 2017, 23, 6118-6128, 2016
The ability to reason beyond established knowledge allows Organic Chemists to solve synthetic problems and to invent novel transformations. Here, we propose a model which mimics chemical reasoning and formalises reaction prediction as finding missing links in a knowledge graph. We have constructed a knowledge graph containing 14.4 million molecules and
arxiv   +1 more source

Stirring Speeds Up Chemical Reaction [PDF]

open access: yes, 2021
We consider absorbing chemical reactions in a fluid flow modeled by the coupled advection-reaction-diffusion equations. In these systems, the interplay between chemical diffusion and fluid transportation causes the enhanced dissipation phenomenon. We show that the enhanced dissipation time scale, together with the reaction coupling strength, determines
arxiv   +1 more source

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