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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 237 Documents
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Bleach Effectively in Removes The Stubborn Stains Moondra Zubir; Ayi Darmana; Marini Damanik; Hafni Indriati Nasution; Osi Annauli G; Vrili Coirala Rama Uli Siregar; Yosi Santika Silitonga
Indonesian Journal of Chemical Science and Technology (IJCST) Vol 3, No 1 (2020): January 2020
Publisher : Universitas Negeri Medan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24114/ijcst.v3i1.18312

Abstract

Along with the development of science and technology, more and more types of manufactured goods produced to meet our needs we need to know that among these materials there are dangerous or toxic, therefore it is very important for us to know the type, nature, usefulness, as well as the dangers of every chemical that we use at home As we know, all kinds of objects that are around us are actual material, all material consists of chemicals but, in our daily lives we commonly use the term material instead of chemicals. Clothing that we use every day will be prone to stains so it is important to know how to remove stubborn stains on clothes. It would be very inconvenient if the clothes worn are dirty and not beautiful to the eye. There are many types of stains, ranging from dirty sweat, blood, residual makeup, black spots caused by fungus, to stains from the outside such as stains caused by rust, paint, oil, ink or spills of food and drinks. If you use the wrong method to remove these stains, it is not uncommon for us to find difficulties and can even be fatal as they get dirty. Each type of stain has a different treatment, depending on the nature of the stain. Bleach is now available as a solution to the problem of stains on these clothes.
Review of Adsorption of Fe Metal by Activated Carbon Adsorbent Fakta Ideal Zega; Rini Selly; Moondra Zubir
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.v4i2.27600

Abstract

Many researchers have used activated carbon as adsorbents for the adsorption heavy metal. The aim of present study was to investigate the adsorption properties of activated carbon for the removal of Fe metal. A research has been conducted to determine optimal of stirring time, stirring speed, adsorbent mass and particle size on activated carbon adsorbent in adsorption Fe metal. From the literature survey that increase in stirring time, stirring speed and adsorbent mass enhancing the removal of Fe metal. The results show which is on stirring time 60 minutes, stirring speed 90 radians per minute and adsorbent mass 2 grams have a high adsorption of the heavy metals of iron. Whereas the smaller of particle size enhancing the adsorption of Fe metal. The particle size of 200 mesh is the optimal particle size for adsorption of Fe. Finally, activated carbon showed to be a good potential adsorbent for removing Fe.
Utilization of Betadine as an Indicator of the Presence of Vitamin C (Ascorbic Acid) In Fruits and Vegetables Tariza Humaira Tembusai; Annisa Tri Banoeari; Riris Mandaoni Siahaan
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.v4i2.27595

Abstract

This study aims to find out whether or not there is a content of vitamin C in tomatoes, cucumbers, chayote, spinach, lime and bilimbi by reacting with betadine containing povidone iodine 10% w/v, which is equivalent to 1% iodine. If iodine reacts with vitamin C, then the color of iodine will disappear. Each extract of fruits and vegetables is added to a glass containing aqua that has been added 25 drops of betadine with a solution color that is reddish brown. Obtained discoloration from each addition of fruit and vegetable extract: a) Cucumbers change color to solid bright yellow, b) Tomatoes change color to clear bright yellow, c) Chayote change color to white, d) Spinach changes color to dark green, e) Lime changes color to brownish orange and f) Bilimbi changes color to orange. The discoloration that occurs indicates that tomatoes, cucumbers, chayote, spinach, lime and bilimbi contain vitamin C.
Identification of Explosion from Hydrogen Gas Fithriyyah Karimah; Tico G Samosir; Fuaddinda P Salsabila
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.v4i2.27599

Abstract

Hydrogen or sometimes called water, is a chemical element on the periodic table that has the symbol H and atomic number 1. At standard temperatures and pressures, hydrogen is colorless, odorless, non-metallic, singlevalent, and a highly flammable diatomic gas. With an atomic mass of 1.00794 amu, hydrogen is the lightest element in the world. It is also the most abundant element, accounting for roughly 75% of the total elemental mass of the universe. Most stars are formed by hydrogen in the plasma state. Hydrogen compounds are relatively rare and rarely found naturally on Earth, and are usually produced industrially from various hydrocarbons such as methane. Hydrogen can also be produced from water through electrolysis, but this process is more expensive commercially than producing hydrogen from natural gas. With the aim to prove the explosion that occurred and the reaction that occurred during the experimental process of an exothermic or endoderm reaction explosion
Determining the Most Stable Structure of Benzamided Derivatives Using Density Functional Theory (DFT) Cinthia Uly Hotnami Sinaga; 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.v4i2.27594

Abstract

This study aims to determine the energy change ∆E and determine the most stable compound based on computation results using the Density Functional Theory (DFT) method. In determining the energy change ∆E and determining the most stable compound, computational chemical calculations were used using NWChem version 6.6 software with the DFT method with the B3LYP / 3-21G base set hybrid function, the results of the calculations were visualized using the Jmol software. The results of computational calculations on the compound Benzamide is 57467.3632844735 kJ / mol, (4 - chlorocarbonyl - benzial) - pyridine acid carbamics - 3 - ilmetyl ester is 641022.0125237265 kJ / mol, (4- phenylcarbamil benzyl) - pyridine acid carbamic - 3 - ilmetyl ester of 491144.0953277345 kJ / mol, [4- (2-nitro - phenyl carbamoyl) - benzyl] - pyridine acid carboxy - 3 - ilmetyl ester of 1031145,366027853 kJ / mol while for [4 - 2 (amino - phenyl carbamyl) - benzyl) - carboxylic acid - 3 - ilmetyl ester of -1034711.17423932 kJ / mol. Based on these data it can be concluded that [4 - 2 (amino - phenyl carbamyl) - benzyl) - carboxylic acid - 3 - ilmetyl ester is the most stable compound formed because of its lowest price (exothermic)
The Effect of Sambung Nyawa Leaf Extract (Gynura procumbens (Lour.) Merr.) on Hemoglobin of Rats Induced by Escherichia coli Bacteria Asnad Gulo; Pasar M Silitonga
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.v4i2.27603

Abstract

The aim of this research was to study the effect of extract of the sambung nyawa (Gynura procumbens (Lour.)Merr.)) leaf on hemoglobin concentration of rats blood. The research method is experimental used Completely Randomized Design (CRD) that consists of 6 treatments and 3 replications. The treatment of this research was induced rats with E. coli then given 0.5 mL of sambung nyawa leaf extract with doses 0.0 mg/kgBW; 300 mg/kgBW; 600 mg/kgBW and 900 mg/kgBW . The data was analyzed using Analysis of Variance. The results showed that the giving extract of the sambung nyawa leaves gives effect on on hemoglobin concentration of rats blood. Giving sambung nyawa leaf extract at dose 0.00 mg/kgBW; 300 mg/kgBW; 600 mg/kgBW and 900 mg/kgBW to rats gave the average of hemoglobin concentration in a row in each treatment is 10,5 g/dL; 11,7 g/dL; 12,3 g/dL and 13,7 g/dL.
Making Charcoal Water Electrodes Amalia Amira Rashidah; Amar Lohot Tanjung; Sindi H Sembiring
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.v4i2.27598

Abstract

Charcoal is the residual waste from the heat decomposition process of carbon-containing materials, most of whose components are carbon. This study aims to determine the frequency of charcoal water as an electrolyte solution to produce an alternative energy source that is environmentally friendly. The method used in the experiment is to find the type of water with the addition of zinc and copper and to measure the sample voltage of charcoal water to determine the optimum mass and optimum interaction time. The variation in the volume of water with 50 ml and 100 ml of charcoal water was produced, with the addition of zinc and copper in the size of 1x5 cm, 2x5 cm, 3x5 cm which resulted in fluctuations in each data. For example, the difference in voltage value in the type of water used is tap water, 100 ml well water with the addition of zinc and copper measuring 2x5 cm. Tap water, namely with an electric voltage of 0.65 V, 0.70 V, 0.60 V, 0.60 V, 0.75 V and well water with an electric voltage of 0.60 V, 0.55 V, 0.55 V, 0.55 V, 0.55 V. Less than the maximum frequency produced with two glasses that are not made into a series or parallel circuit.
Comparison Of Acetic Acid With As Formiic Acid Latex Pump Material Rudi Munzirwan
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.v4i2.27593

Abstract

Research on the comparison of acetic acid and formic acid as a latex coagulant has been carried out. To the latex coconut shell charcoal (particle size 80 mesh) was added to the weight of 42 grams then the latex was coagulated with acetic acid and formic acid with a pH of 4.7. As a research, the quality of rubber was carried out by measuring the initial plasticity, plasticity retention index and viscosity of rubber mooney. Finally, latex coagulated with acetic acid produced a better rubber than latex coagulated with formic aci).
Analysis of Electrical Energy Contained in Vegetables Annisa Tri Banoeari; Tariza Humaira Tembusai; Riris Siahaan
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.v4i2.27602

Abstract

This study aims to determine the source of electrical energy in potatoes and lime. The method used is based on the principle that the salt content in potatoes is a solution, where salt is the solute and water is the solvent, so the ions can move freely. The movement of the ions in the potato can conduct electricity. For the contained acid lime affects the hardness of the composite, which affects the matrix and filler bonds. oxalic acid, which is in lime juice, is a type of electrolyte solution. In a voltaic cell, the electrolyte solution can function to deliver ions from the anode to the cathode so that it can produce electrical energy. Electrical energy is energy that is very important in life. Electrical energy is a basic human need so that potatoes and lime can be used as an alternative source of electrical energy.
Electric Energy Potential from Pineapples and Potatoes Atikah Nur Syahirah; Riska Cahyati
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.v4i2.27597

Abstract

Basically, the voltage can be obtained from various sources, including fruit. Fruit is often used as food, drink and a source of vitamins for the body's defense system. It turns out that it has the ability to generate electricity, especially for fruit that has a high acidity level. The acidity in some types of fruit is able to generate electricity because it is electrolyte. Fruits which contain mineral acids in the form of hydrochloric acid and citric acid, are strong electrolytes that break down completely into ions in a water solution. Besides having acid, fruits also contain a lot of water, so that when two different metals are immersed, the fruit solution will create a potential difference between the metal and water so that there is an electrode potential that can generate electric current as well. The purpose of making a rough draft of this practicum is to prove the existence of electrical energy in pineapples and potatoes. In this experiment, it has been proven that pineapples and potatoes can produce an electric current, indicated by the presence of a voltage when measured by a voltmeter.

Page 6 of 24 | Total Record : 237

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