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Moondra Zubir
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INDONESIA
Indonesian Journal of Chemical Science and Technology
Published by Universitas Negeri Medan
ISSN : 26221349     EISSN : 26224968     DOI : -
Core Subject : Science, Engineering,
Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Energy Materials Science & Nanotechnology
Jurnal ini mempublikasikan artikel di bidang Kimia yang meliputi penelitian dasar dan terapan. Bentuk Publikasi di Indonesian Journal of Chemical Science and Technology : * Artikel * Review (berdasarkan permintaan Dewan Redaksi) * Communication (berdasarkan permintaan Dewan Redaksi)
Arjuna Subject : Kimia(semua kategori) - Kimia (Lain-Lain)
Articles 179 Documents
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Study Of Energy And Structure On Intermolecular Interactions In Organic Solvents Using Computational Chemistry Method Nur Aisah Malau; Asep Wahyu Nugraha
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 4, No 2 (2021): JULI 2021
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v4i2.27601

Abstract

This study aims to determine the amount of energy, the difference in energy, the relationship between the amount of energy and the distance between compounds, and the interactions that occur in organic solvent molecules using computational chemistry methods. In determining the amount of energy and interactions that occur, computational chemistry calculations are used using NWChem software version 6.6 with the DFT method with the B3LYP hybrid function/basis set 6-31G, the calculation results are visualized using Jmol software. The results of calculations with large computations of energy for benzene are -230.62447487 KJ/mol, ethanol -154.01322923 KJ/mol, methanol -114.98816558 KJ/mol, hexane are -235.27001385 KJ/mol. Mixture of benzene and ethanol in a ratio of 1 : 1 -384.63823964 KJ/mol, 1 : 2 538.66009762 KJ/mol , and 2 : 1 - 615.26607558 KJ/mol. A mixture of benzene and methanol in a ratio of 1 : 1 -345.61255299 KJ/mol, 1 : 2 - 460.60826254 KJ/mol, and 2 : 1 -576.24044425 KJ/mol, a mixture of hexane and ethanol in a ratio of 1 : 1 - 389.28477268 KJ/mol, 1 : 2 -543.29869234 KJ/mol and 2 : 1 -624.55723290 KJ/mol. A mixture of hexane and methanol at a ratio of 1 : 1 -350.25984691 KJ/mol, 1 : 2 -465.26041654 KJ/mol and 2 : 1 -585.53373886 KJ/mole. The difference in energy is the most in a mixture of benzene and ethanol in a ratio of 1 : 2 -0.00916429 K /mol, in a mixture of benzene and methanol in a ratio of 1 : 2 - 0.00745651 KJ/mol, a mixture of hexane and ethanol in a ratio of 2 : 1 -0.00397597 KJ/mol, and a mixture of hexane and methanol in a ratio of 1 : 2 - 0.01407153 KJ/mol. and there is no relationship between the magnitude of the interaction energy of the mixture with the distance between the molecules.
Effect of Differences of HCl Concentration on the Reaction of Chlorine Gas and Acetylene Gas In Clothing Liquids and Floor Cleaning Liquids Salsabila Tambunan; Maya N Sari; Lia M Nasution; Siti Rahmah; Nurfajriani Nurfajriani
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 4, No 2 (2021): JULI 2021
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v4i2.27596

Abstract

Floor cleaning fluid containing a solution of HCl mixed with carbide (CaC2), produces a reaction in the form of gases, air bubbles and there is sedimentation. The resulting gas is acetylene gas. NaClO solution in clothes bleach reacts with HCl in floor cleaning fluid to produce a reaction in the form of an explosion of fire, soot / carbon and produces chlorine gas. This study aims to determine the effect of differences in the concentration of HCl in floor cleaning fluid to produce the reaction of chlorine gas and acetylene gas by mixing floor cleaner with carbide and clothes bleach. In this study, using a floor cleaner with a concentration of 12% HCl and a concentration of 17% as a comparison. The results obtained are that the difference in the concentration of HCl has an effect on explosions, gases.
Secondary Metabolite Phytochemical Screening Of Toba Frankincense Leaves (Styrax Paranelonerum Perk) Ruth Natalia Manurung; Marham Sitorus
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33140

Abstract

Toba frankincense plant (Styrax Paralleloneurum PERK) is a native Indonesian plant originating from the west coast of Sumatra, grows naturally and has been widely cultivated. This study aims to identify what secondary metabolites are contained in Toba incense leaves (Styrax Paralleloneurum PERK).
Understanding the Difference Between Chemical Changes and Physical Changes Yoahana Elisabet; Catur Kurniawan
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33160

Abstract

The purpose of this study is to distinguish physical changes and chemical changes. This study uses an experimental method, in which this experiment is carried out to prove data and hypotheses regarding changes in physics and chemical changes. The hypotheses and data that will be proven are the factors that influence physical changes and chemical changes, examples of physical changes and also chemical changes, as well as significant differences between physical and chemical changes. In this research, I used some tools and I need some materials. For the tools that used in this research were test tube holders, measuring pipettes, droppers, spirits lamp, clay triangle and gauze, beaker glass, test tubes and also the rack of test tubes, watch glass. While for the materials that needed are I2, CuSO4, Mg, HCl, CCl4, KI, wax, H2O.
Preparation of Cryogenik Alcohol Erika Yusnidar Samosir
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33136

Abstract

Cryonics is an effort to preserve the human body in frozen conditions with the aim of reviving it at some time in the future. Cryogenic techniques have been developed to increase the solubility of a drug by creating amorphous drug particles with a nanoparticle structure and have high porosity under very low temperature conditions. So that a dry powder is formed which can be obtained from a drying process such as freeze drying. Cryogenic freezing is usually carried out using the help of a liquefied gas such as helium. In the medical field, cryogenic freezing is used to preserve vaccines so that they remain stable and can be stored for a long time. After freezing at low temperatures, these various items can be kept frozen by means of special refrigeration units, including mobile freezer units, thus making shipping possible.
Process and Characterization of Natural Rubber Modification (Sir-20) With Grafting Maleat Anhydride Murdoni Sipayung; Eddyanto Eddyanto
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33141

Abstract

Modification of natural rubber by Grafting method using monomer maleate anhydride is a technique of  modification of natural rubber polymers that aims to change the physical and chemical sifak of natural rubber  polymers. The grafting process is carried out by comparing the amount of MA that is graphed based on the type of peroxide, the variation of peroxide concentration and the variation of MA concentration. FTIR test results showed the appearance of peak absorption at the wave number of 1710-cm cluster C=O carbonyl from MA that is graphed in natural rubber.. Based on the comparison of ir analysis of peroxide concentration used i.e. (0.01, 0.05 and 0.1) molar ratio obtained the largest carbonyl index at DCP concentration of 0.05 mr similarly, the  comparison of IR analysis results of MA concentration variations (3, 6, 9, 12) phr shows the largest carbonyl  index that appears in the C=O absorption area is in the KA-g-MA sample with a MA variation of 12 phr with  Carbonyl index = 45.81. The degree of MA grafting on natural rubber structures increases with increased MA concentration.
Corrosion Factors on Nail Titania Natasya; Muthia Embun Khairafah; Murna Sari Br Sembiring; Laura Nazrifah Hutabarat
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33159

Abstract

Corrosion is a chemical phenomenon in metal materials that can occur due to physical, chemical or biological processes. Physical processes are characterized by the destruction of metal morphology, chemical processes are characterized by chemical processes that occur in metals, and biological processes are characterized by the activity of destructive bacteria on metals. In this practicum, corrosion experiments were carried out on nails. The subjects in this study were 6 nails. This research was conducted by quantitative method, namely Experiment. The experimental method is a quantitative research method used to determine the effect of the independent variable (treatment) on the dependent variable (outcome) under controlled conditions. The result of his research is that the fastest and most visible corrosion is in plastic cups which are given hot water as a medium.
Analysis of Separation of Hydrogen and Oxygen Gases from Water through Water Electrolysis Experiments Reinhard P Sihotang; Elsama Christina Manalu; Ryandi Simbolon
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33137

Abstract

Electrolysis of water is the decomposition of water compounds (H2O) into oxygen (O2) and hydrogen gas (H2) using an electric current that passes through the water. At the cathode, two water molecules react by capturing two electrons, reducing them to H2 gas and a hydroxide ion (OH-). Meanwhile at the anode, two other water molecules decompose into oxygen gas (O2), release 4H+ ions and flow electrons to the cathode. The H+ and OH- ions undergo neutralization so that some water molecules are formed again. The hydrogen and oxygen gases generated from this reaction form bubbles at the electrodes and can be collected. This principle is then utilized to produce hydrogen and hydrogen peroxide (H2O2) which can be used as fuel for hydrogen vehicles.
Effect of Addition of Ethanol Extract from Sijukkot Leaves (Lactuca Indica L.) on Cholesterol Reduction in Male Strain Rats (Rattus Norvegicus) Felivia Angelina Munte; Albinus Silalahi
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33142

Abstract

Cholesterol is one of the lipids that can form cell membranes and extremity layers and functions as a lipoprotein compound. Rising cholesterol levels can cause various diseases. The leaves of the sijukkot plant have been used as a lowering of cholesterol levels in the body. By using SPSS analysis, it was found that the Shapiro-Wilk Normality Test with a sig value > 0.05, the data were normally distributed. The results of the analysis in the Test of Homogeneity of Variances table obtained a Sig value of 0.510. Thus the value of Sig = 0.510 > 0.05, then Ho is accepted. Thus, the ethanol extract of sijukkot leaves has the potential to reduce cholesterol levels. By using four different doses, the rat group at a dose of 100 mg/kgBW showed cholesterol levels of 77.25 (mg/dL) ± 9.14, the rat group at a dose of 200 mg/kgBW showed cholesterol levels of 62.75 (mg/dL) ± 5.44, the rat group at a dose of 200 mg/kgBW showed a cholesterol level of 62.75 (mg/dL) ± 5.44. 300 mg/kgbw showed a cholesterol level of 61.50 (mg/dL) ± 4.1 and a group of rats at a dose of 400 mg/kgbw showed a cholesterol level of 54.50 (mg/dL) ± 4.1
Kinetics Study of Gold (III) on Chitosan-Silica Coated Magnetic Material Dikki Miswanda; Moondra Zubir; Rini Selly; Siti Rahmah; Nuryono Nuryono
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 5, No 1 (2022): JANUARI 2022
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v5i1.33158

Abstract

A study of the adsorption kinetics of Au(III) ions has been carried out by an adsorbent of silica-chitosan coated magnetic material (BMSK). The BMSK adsorbent was synthesized through a sol-gel process using magnetic materials from iron sand, sodium silicate, and chitosan with 3-chloropropyltrimethoxysilane linker. The adsorption kinetics was studied through batch adsorption system by varying the adsorption time. The number of adsorbed Au(III) ions was calculated based on the difference in metal concentrations before and after adsorption which was analyzed by atomic absorption spectroscopy. The equilibrium of the adsorption of Au(III) ions by the BMSK adsorbent began to occur after the adsorption lasted for 60 minutes. The data shows the interaction of BMSK adsorbent with Au(III) ion following a pseudo order-2 reaction kinetics model with a value of reaction rate constant (k) = 1.199 x 103 g.mg-1.min-1.

Page 7 of 18 | Total Record : 179

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