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INDONESIA
Jurnal Akademika Kimia
Published by Universitas Tadulako
ISSN : 24775185     EISSN : 23026030     DOI : -
Core Subject : Science, Education,
Chemistry Education
Jurnal Akademika Kimia merupakan jurnal elektronik open access yang bertujuan untuk mempublikasi hasil-hasil penelitian terbaru dalam area pendidikan akademik khususnya pada bidang pendidikan kimia meliputi asesment pembelajaran, model pembelajaran dan pengembangan perangkat pembelajaran, serta kimia murni termasuk kimia organik, kimia anorganik, kimia analitik, kimia fisik, biokimia dan bidang kimia lainnya seperti kimia lingkungan.
Arjuna Subject : -
Articles 8 Documents
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Search results for , issue "Vol 2, No 3 (2013)" : 8 Documents clear
MODEL PEMBELAJARAN KOOPERATIF TIPE STAD (STUDENT TEAMS ACHIEVEMENT DIVISION) DIKOMBINASIKAN DENGAN MEDIA ANIMASI PADA MATERI LAJU REAKSI KELAS XI SMA NEGERI 1 PALU Berlin, I Dewa Gede; Walanda, Daud K.; Ratman, Ratman
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

Students have difficulties in understanding chemistry subject contained mathematical calculation like on reaction rate topic. Cooperative learning model STAD type can be an alternative for the material contained calculation whereas animation media is for conceptual understanding. The objective of the research was to determine the influence of cooperative learning model STAD type combined with animation media for the eleventh grade students of SMA Negeri 1 Palu in academic year 2012/2013 toward the students’ learning outcome on reaction rate material. This research was quasy experimental using posttest-only control group design. The population was the whole eleventh grade students of science program with the sample determination using purposive sampling method. The sample were class of science program 2 as the experimental class which using cooperative learning model STAD type with animation media whereas class of science program 4 as the control one which using convensional learning method. The research results showed that cooperative learning model STAD type combined with animation media at reaction rate material gave students’ learning outcome higher than convensional method.
KANDUNGAN MERKURI (Hg) DALAM AIR LAUT, SEDIMEN, DAN JARINGAN IKAN BELANAK (Liza melinoptera) DI PERAIRAN TELUK PALU Yusuf, Moh.; Hamzah, Baharuddin; Rahman, Nurdin
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

Mercury (Hg) is one type of a dangerous heavy metals. As one of contaminants, mercury enter the aquatic ecosystem through atmospheric decomposition or sourced from the industrial waste externalisation and bilogical and chemical converted in methyl mercury. This research aims to find out and determine the mercury concentrate which contained in sea water, sediment and belanak (Liza melinoptera) network in Palu bay water. The analysis of mercuri content on the tested sample using Automatic Mercury Analyzer. The working principle of the device is gold amalgamation method by heating and separation. The research result showed that the mercury content in belanak network is 0.143 - 0.188 ppm, sediment is 2.453 - 2.800 ppm and the sea water is 0.030 – 0.040 ppm. Based on the decision of the state minister of environmental regarding the guidelines for determination of Hg standard quality for sea water is 0.002 ppm and 0.001 ppm for marine biota. It shows that the Palu bay water condition has been polluted and the belanak is not worth to be consumed.
PENGARUH ION KROMIUM(III) PADA EKSTRAKSI ION TEMBAGA(II) MENGGUNAKAN EMULSI KEROSEN DENGAN 1-FENIL-3-METIL-4-BENZOIL-5-PIRAZOLON SEBAGAI PEMBAWA KATION Hamzah, Baharuddin; Said, Irwan; Hardani, Ririen
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

The influence of chromium(III) ion on copper(II) ion extraction using kerosene emulsion with 1-phenyl-3-methyl-4-benzoyl-5-pyrazolone (HPMBP) as a cation carrier was investigated. The optimum condition for copper(II) extraction were as follows: concentration of mixed surfactant (span 80+span 20) was 5%, volume ratio of kerosene and internal phase was 1, concentration of HPMBP was 0.025 M, concentration of HCl was 1 M, volume ratio of emulsion and external phase was 0.143. The results showed that the extraction of copper(II) ion was selective to chromium(III) ion, relatively. The result also showed that the presence of 500 ppm chromium(III) ion decrease the percentage of copper(II) ion extraction from 98.6 to 91.0.
ANALISIS SENYAWA ALKALOID DAUN TANAMAN JOHAR (Cassia siamea Lmk.) YANG BERPOTENSI SEBAGAI INSEKTISIDA PADA NYAMUK Setiawan, Topan; Aminah, Sitti; Jura, Minarni R.
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

Research about alkaloid compound of johar plant leaf (Cassia siamea Lmk.) which potential as insecticide at mosquito. The methods are used is laboratory experiment from johar plant leaf extract. Alkaloid has product from separated extract of johar plant leaf. Maximum wave has product by UV-Vis spectrophotometer is 306 nm. TLC product of johar plant leaf extracts are 2 components (Rf 0.89 and 0.91). TLC product of johar plant leaf alkaloid is 1 component (Rf 0.91). The product of HPLC showed 4 components for johar plant leaf and 2 components for alkaloid. The insecticide force of 25 mosquitos did by third for extract and alkaloid. The products are johar leaf extract have insecticide force for each treatment are 14, 10 and 14 mosquitos although alkaloids are 13, 8 and 2 mosquitos.
ANALISIS KUALITATIF ZAT BIOAKTIF PADA EKSTRAK DAUN ALPUKAT (Persea americana Mill) DAN UJI PRAKLINIS DALAM MENURUNKAN KADAR GLUKOSA DARAH PADA MENCIT (Mus musculus) Putri, Eska Perdanawati Kahar; Hamzah, Baharuddin; Rahman, Nurdin
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

Diabetes is the oldest disease in the world, the death rate cause by diabetes mellitus is increasing. This study aims to know bioactive substances of avocado leaf and effective concentrate in decreasing the level of mice blood glucose. The study apply experimetal method to analyze bioactive substance in avocado leaf extract qualitatively. Whereas the preclinical testing use random group design. This study used 15 male mice as test animal which are induced with etilen diamin tetra asetat (EDTA). The mice are divided into 5 groups (n=5) randomly with different treatment. Treatment I, II, III are given avocado leaf extarct each with concentrate of 10%, 20% and 40%, treatment IV is given suspension of glibenklamid as a positive control (+) and treatment V is given 1% suspension of sodium carboxymethil cellulose (Na-CMC) as a negative control (-). Data obtained is analysed by using statistical analysis of varians (ANOVA) wich is continued with Duncan test. The research result shows that advocado leaf extract positively contains compounds of alkaloid, flavonoid, saponin, tanin and steroid. Praclinic test shows that advocado leaf extract proven can lower the level of mice glucose and relatively the most effective concentrate is 10%.
PERBEDAAN HASIL BELAJAR SISWA SMA NEGERI 5 PALU MELALUI PENERAPAN MODEL PEMBELAJARAN KOOPERATIF TIPE COURSE REVIEW HORAY DAN KONVENSIONAL PADA MATERI LARUTAN ELEKTROLIT DAN NONELEKTROLIT Salim, Agustiawan Amat; Said, Irwan; Gonggo, Siang Tandi
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

One of indicator that quality of education said to be good is when students able to apply what they have learned at school to deal with problems in their daily life. Learning in the classroom should not only focus on mastery of the materials but also how to create the atmosphereT in the classroom to be fun and interesting so that students are not bored and learning outcomes can be improved. Course Review Horay (CRH) is one of a model that can be applied. This research aims to find out the difference of learning outcome of SMA Negeri 5 Palu through cooperative learning model application of CRH on electrolyte and non electrolyte solutions material. Populations of this research are all students of grade X of SMA Negeri 5 Palu for Academic Year of 2012/2013 which are consists of seven classes. Sample of this research consist of two classes which are class XA with 28 students as experiment class and class XG with 27 students as control class which determined by purposive sampling. Data collection is conducted using test instrument such as chemistry learning achievement of Electrolyte and non electrolyte solutions material. Data from research result is tested using two parties t-test with prerequisite test which are; normality test and homogeneity test. Average score of students learning outcome using cooperative learning model CRH is 23.21 while the average score of students learning outcome who join the conventional teaching is 19.93. Based on the statistic analysis with statistic t-test is achieved thitung = 4.81 and this is in the rejection area of H0 which is -2.00 and 2.00. Therfore, it can be concluded that there is a difference of students learning outcome through Cooperative learning model application of CRH type and conventional to the students grade X of SMA Negeri 5 Palu.
AKUMULASI LOGAM TIMBAL (Pb) DAN LOGAM TEMBAGA (Cu) DALAM UDANG REBON (Mysis. Sp) DI MUARA SUNGAI PALU Fujiastuti, Fujiastuti; Said, Irwan; Sakung, Jamaluddin
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

The estuary of Palu River is one of river in Palu city which becomes income sources for the local fisherman. The main catch is rebon shrimp (Mysis. Sp). There are many human activities along the Palu River which potentially produce waste that containing heavy metal including lead and copper metal which can contaminate the water. This research aims to find out the content of lead metal (Pb) and copper metal (Cu) which accumulated in rebon shrimp (Mysis. Sp) in the estuary of Palu River. This research used field observation method by taking sample of rebon shrimp (Mysis. Sp) in the estuary of Palu River. The content of lead metal and copper metal inside rebon shrimp (Mysis. Sp) were determined by using Spectro Direct device. Data obtained were analysed descriptively by comparing food standards based on the decree of Directorate General of Drug and Food Control Number 03725/B/SK/VII/89 and SNI 01-2729.1-2006. The research result showed that the content of lead metal inside rebon shrimp (Mysis. Sp) 0.57 mg/kg, which means lead metal has exceeded the specified threshold of food value (0.4 mg/kg). While the content of copper metal inside rebon shrimp (Mysis. Sp) <0.5 mg/kg still below the specified threshold (20 mg/kg).
PROFIL KINETIKA PERUBAHAN KADAR GLUKOSA PADA NASI DALAM PEMANAS Islamiyah, Ukuwah; Gonggo, Siang Tandi; Pursitasari, Indarini Dwi
Jurnal Akademika Kimia Vol 2, No 3 (2013)
Publisher : Universitas Tadulako

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Abstract

Rice cooker is used to keep rice warm and soft. During the warming process there is a change in glucose level in rice. The kinetic profile of glucose level change of rice in rice cooker is important to be done to determine an ideal time needed so that rice is suitable for consumption. The objective of this study is to determine constant reaction rate, reaction order, reaction speed, and half time of glucose level changes of rice in rice cooker. Method of this study is phenol-sulfuric acid, where modest sugar react with phenol in concentrated sulfuric acid produce a stabil orange colour, by using uv-vis that is bsorbed in 490 nm wavelength. The research’s result shows that there is a decreasing on glucose level in rice of mbramo type that is 32.2 ppm to 5.8 ppm for 40 hours kept in rice cooker. The changesof glucose level of rice in rice cooker following equation of one order reaction, with value of constant reaction speed achieved is 3.8 x 10-2/hour, half time 18.2 hours and reaction speed 0.5 ppm/hour.

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