Results 21 to 30 of about 1,118,373 (277)
Mimbar Sekolah Dasar, 2022 This study aims to examine the effects of argumentation-supported problem-based learning (AS-PBL) carried out in the Chemistry-II laboratory course on the conceptual understanding of prospective science teachers about "Chemical equilibrium and Le ...
Hatice Güngör Seyhan +1 more
doaj +1 more source
JTK (Jurnal Tadris Kimiya), 2020 Science literacy is the main key to face challenges in the 21st century. The research aimed to describe the students’ science literacy on chemical equilibrium topic through implementation of guided inquiry learning model.
Ragil Triyani, Utiya Azizah
doaj +1 more source
Effect of Secondary Combustion on Thrust Regulation of Gas Generator Cycle Rocket Engine
Applied Sciences, 2022 Thrust regulation is applied to maintain the performance of the liquid propellant rocket engine. The thrust level of a rocket engine can be readily controlled by adjusting the number of propellants introduced into the combustion chamber. In this study, a
Sohaib Khan +4 more
doaj +1 more source
Effect of Vibrational Excitation on the Theoretical Performance of the Stoichiometric Carbon-Oxygen Propellant System [PDF]
, 1952 Accurate calculations to evaluate the performance of the stoichiometric carbon-oxygen propellant system have been carried out for nozzle flow with and without chemical reactions and with and without vibrational adjustment. The calculations show that, for
Schroeder, J. H.
core +3 more sources
DISTRIBUTION OF SOLUBLE AND INSOLUBLE CHEMICAL SPECIES OF CHROMIUM (III) AND (VI) IN AQUEOUS SOLUTIONS [PDF]
Chemistry Journal of Moldova: General, Industrial and Ecological Chemistry, 2014 On the basis of currently revised thermodynamic data for Cr(III) and Cr(VI) hydrolysis and photolytic equilibria in addition to original thermodynamic and graphical approach, used in this paper, the repartition of their soluble and insoluble chemical ...
Oxana Spinu
doaj
Equilibrium relationships for non-equilibrium chemical dependencies
, 2010 In contrast to common opinion, it is shown that equilibrium constants determine the time-dependent behavior of particular ratios of concentrations for any system of reversible first-order reactions.
Constales, Denis +2 more
core +1 more source
The nature of the potassium compound acting as a promoter in iron-alumina catalysts for ammonia synthesis [PDF]
, 1975 The chemical form of the potassium promoter on an iron-alumina catalyst during ammonia synthesis has been studied by two methods, viz, (i) the measurement of the equilibrium constant of the process KNH2 + H2 KH + NH3, and (ii) chemical analysis of the ...
Bolink, W.J. +3 more
core +3 more sources
Química Nova, 2011 In this paper it is presented a thermodynamic analysis that aims to find the mathematical expression of the variation of extent of reaction with the infinitesimal variation in the temperature at constant volume of a chemical equilibrium mixture. The goal
Joan Josep Solaz-Portolés
doaj +1 more source
Systems, 2022 Material structures and chemical equilibrium are important learning units in high school chemistry. In this study, an augmented reality (AR) system is developed to assist high school students in learning chemistry.
Wernhuar Tarng +2 more
doaj +1 more source
Coannihilation without chemical equilibrium
, 2017 Chemical equilibrium is a commonly made assumption in the freeze-out calculation of coannihilating dark matter. We explore the possible failure of this assumption and find a new conversion-driven freeze-out mechanism.
Garny, Mathias +3 more
core +1 more source