Determination of the Rate Law for a Reaction; Catalysis

1975 ◽  
pp. 211-216
Author(s):  
Frank Brescia ◽  
John Arents ◽  
Herbert Meislich ◽  
Amos Turk ◽  
Eugene Weiner
Keyword(s):  
Rate Law

scholarly journals PENGEMBANGAN BAHAN AJAR KIMIA RINTISAN SMA BERTARAF INTERNASIONAL KELAS XI MATERI LAJU REAKSI

2012 ◽  
Vol 13 (1) ◽  
pp. 1-12 ◽  
Author(s):  
Inova Putri Carera ◽  
I Wayan Dasna
Keyword(s):  
High School ◽  
High School Students ◽  
Reaction Mechanism ◽  
Reaction Rate ◽  
Reaction Order ◽  
Average Score ◽  
School Students ◽  
Factors Affecting ◽  
Rate Law

This study was aimed to develop teaching materials about chemical reaction rate which covered materials adapted to A-Level High School students of grade XI in Pioneer International Standard High School (RSMA-BI). The developmental research was adopting the instructional development model 4D which include four stages of development, namely define, design, develop, and disseminate. Instructional materials were written in English consist of seven topics titled: Reaction Rate Concept, The Exchange's Expressions, Rate Law and Reaction Order, Experimental Determination of a Rate Law, Reaction Mechanism, Theories of Reaction Rate, Factors Affecting Reaction Rate. Results of content validation from content experts obtained the average score of 3. 56 of 14 range of scores which means valid / good / decent. Test limited to high school students of RSBI obtained an average score of 3.35 (valid / good / decent). The results of the use of teaching materials obtained a score of 77.8 which is above the minimal passing grade (75). Therefore it can be concluded that the materials were feasible to be used in the classroom.Penelitian ini bertujuan untuk mengembangkan bahan ajar laju reaksi dengan cakupan materi yang disesuaikan dengan A-Level untuk siswa kelas XI Rintisan Sekolah Menengah Atas Bertaraf Internasional (RSMA-BI. Rancangan penelitian pengembangan mengadaptasi model pengembangan bahan ajar Model 4D yang meliputi empat tahap pengembangan, yaitu define, design, develop dan disseminate. Produk pengembangan adalah bahan ajar kimia RSMA-BI kelas XI materi laju reaksi yang ditulis dalam bahasa Inggris menggunakan pendekatan kontekstual. Bahan ajar terdiri atas empat bagian utama yaitu pendahuluan, materi, evaluasi dan penutup. Materi tersusun atas tujuh sub materi yaitu Reaction Rate Concept, The Rates Expressions, Rate Law and Reaction Order, Experimental Determination of a Rate Law, Reaction Mechanism, Theories of Reaction Rate, Factors Affecting Reaction Rate. Hasil validasi isi dari ahli materi diperoleh nilai rata-rata 3,56 dari rentang skor 1-4 dengan kriteria valid/baik/layak. Hasil uji terbatas pada siswa SMA RSBI diperoleh nilai rata-rata 3,35 dari rentang skor 1-4 dengan kriteria valid/baik/layak. Hasil uji penggunaan bahan ajar diperoleh skor sebesar 77,8. Skor ini diatas SKM (Skor Kelulusan Minimal) yaitu 75 sehingga dapat disimpulkan bahwa bahan ajar telah layak dan dapat digunakan dalam pembelajaran di kelas.

Kinetic Studies on Photodeposition of Polydiacetylene Thin Films from Solution:  Preliminary Determination of the Rate Law

1996 ◽  
Vol 8 (4) ◽  
pp. 912-915 ◽  
Author(s):  
M. S. Paley ◽  
S. Armstrong ◽  
W. K. Witherow ◽  
D. O. Frazier
Keyword(s):  
Thin Films ◽  
Kinetic Studies ◽  
Rate Law ◽  
Preliminary Determination

Non-Steady-State Kinetics for a Double-Intermediate Enzyme Mechanism: The Case of High Enzyme Concentrations

1972 ◽  
Vol 50 (9) ◽  
pp. 1440-1442 ◽  
Author(s):  
Nasrat H. Huazi ◽  
Keith J. Laidler
Keyword(s):  
Steady State ◽  
General Equation ◽  
Enzyme Mechanism ◽  
Rate Law ◽  
Steady State Kinetics ◽  
High Enzyme ◽  
Text Study

An equation has been derived for the non-steady-state kinetics arising from the mechanism[Formula: see text]in which the concentration of enzyme E is greatly in excess of that of the substrate A; EA and EA′ are two intermediates and X and Y the products. Solutions for the rate of formation of the first product X were given by Kasserra and Laidler. The present work is concerned with the rate of formation of Y. A general equation is derived for the rate of production of Y, and it is shown that under certain simplifying conditions, easily realized in practice, the rate law reduces to [Formula: see text] study of the rate of formation of Y therefore leads to a determination of k3.

scholarly journals Determination of Quantum Yield for the Photochemical Decomposition of Dichloramine-B and Dibromamine-B in Aqueous Acetic Acid Medium

2007 ◽  
Vol 4 (4) ◽  
pp. 502-509
Author(s):  
K. N. Mohana ◽  
N. Prasad ◽  
P. M. Ramadas Bhandarkar
Keyword(s):  
Acetic Acid ◽  
Quantum Yield ◽  
Uv Light ◽  
Incident Light ◽  
Aqueous Acetic Acid ◽  
Acetic Acid Medium ◽  
Rate Law ◽  
Photochemical Decomposition ◽  
Photolytic Decomposition

The photolysis of dihaloamines (RNX2),viz., dichloramine-B (DCB) and dibromamine-B (DBB) in aqueous acetic acid (1:1 v/v) solutions has been studied with the UV light source (λ= 2537 Å). The experimental rate law obtained is - d [RNX2] / dt = k' Io/ [RNX2], where Iois the intensity of incident light. The addition of benzenesulphonamide, the product of photolysis or uranyl ion had no significant effect on the rate of photochemical decomposition. A slight decrease in the rate has been observed by the addition of NaCl / NaBr to DCB / DBB solutions. The quantum yield (Φ) for the photolytic decomposition has been computed. A suitable photolytic mechanism and a rate law consistent with the observed results have been proposed.

Experimental determination of the rate law for charge carrier decay in a polythiophene: Fullerene solar cell

2008 ◽  
Vol 92 (9) ◽  
pp. 093311 ◽  
Author(s):  
C. G. Shuttle ◽  
B. O’Regan ◽  
A. M. Ballantyne ◽  
J. Nelson ◽  
D. D. C. Bradley ◽  
...  
Keyword(s):  
Solar Cell ◽  
Charge Carrier ◽  
Experimental Determination ◽  
Rate Law

Kinetic Study of Iodination of Propanone in Different Acidic Medium by using Colorimeter

2021 ◽  
Vol 11 ◽  
Author(s):  
Nitin Sharma ◽  
Tanveer Alam ◽  
Ashok Kumar
Keyword(s):  
Kinetic Study ◽  
Acidic Medium ◽  
Acid Catalyst ◽  
Time Interval ◽  
Iodine Solution ◽  
Yellow Colour ◽  
Rate Law ◽  
Zero Order Reaction ◽  
Standard Solution

Aims: This study aims at the Kinetic Study of Iodination of Propanone in Different Acidic Medium by using Colorimeter. Background: The kinetic experimentation of iodination of propanone has been performed in presence of different acids such as sulphuric acid, hydrochloric acid and acetic acid. The rate law of the iodination of propanone in acidic medium is determined by observing the disappearance of the brownish yellow colour of iodine in aqueous solution. Objective: The objective of this study is the preparation of standard solution, determination of absorbance of iodine solution at λmax= 480 nm, Kinetic study of iodination of propanone with different acidic medium. Method: The kinetic analysis of this reaction has been carried out by colorimetry. The extent of the reaction has been monitored by measuring the absorbance of the reaction mixture after a suitable time interval. Result: The rate law expression is determined to be rate = k [〖"propanone]" 〗_0^0.728 [acid]0. The rates of iodination of propanone in presence of different acidic medium are H2SO4 > HCl > CH3COOH. Conclusion: The rate of the reaction is found to be independent of the concentration of iodine i.e. it is zero order reaction with respect to iodine. However, it depends on the concentration of propanone and acid catalyst. Other: By using this experimental technique, the consumption of chemicals is very less.

Determination of the Rate Law for a Reaction; Catalysis

1966 ◽  
pp. 201-205
Author(s):  
FRANK BRESCIA ◽  
JOHN ARENTS ◽  
HERBERT MEISLICH ◽  
AMOS TURK
Keyword(s):  
Rate Law

Rate Law Determination of Everyday Processes

2002 ◽  
Vol 79 (8) ◽  
pp. 989 ◽  
Author(s):  
Michael J. Sanger ◽  
Russell A. Wiley ◽  
Erwin W. Richter ◽  
Amy J. Phelps
Keyword(s):  
Rate Law

Determination of rate constants when analytical integration of the rate law is not possible: approaches based on numerical differentiation and numerical integration

1982 ◽  
Vol 60 (6) ◽  
pp. 765-771 ◽  
Author(s):  
J. Peter Guthrie
Keyword(s):  
Numerical Integration ◽  
Rate Constants ◽  
Numerical Differentiation ◽  
Time Data ◽  
Time Curve ◽  
Rate Law ◽  
Rate Laws ◽  
Advantages And Disadvantages ◽  
Order Rate Equation

Two methods for deriving rate constants from absorbance–time data when the rate laws cannot be integrated in closed form are presented, and their use illustrated. One method uses least-squares fitting to the curve obtained by numerical integration of the rate law. The other involves analysis of the numerically evaluated derivative with respect to time of the absorbance–time curve. This allows calculation of rate constants in a direct fashion, either from the initial and minimum values of a function of the derivative or by fitting the decrease in the value of this function to a first-order rate equation when this is suitable. The advantages and disadvantages of the methods are discussed. The illustrations are from recent studies of the reactions of steroidal imidazoles with aryl esters. The derivative method appears to be superior, and of potentially wide utility.

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