Penerapan Model Pembelajaran Koopeartif Tipe Cooperative, Integrated, Reading And Composition (CIRC) pada Materi Struktur Atom dan Sistem Periodik Unsur Kelas X SMAN 1 Pasangkayu

Reaserch was conducted on the atomic structure subject and the periodic table with implementing cooperative learning model type of coopeative, integrated reading and composition (CIRC) in SMAN 1 Pasangkayu is applied to the learning model with the conventional lecture method. This study aims to implement cooperative learning model of CIRC towards the chemical learning outcomes. The population in this study is a class X student of SMAN 1 Pasangkayu academic year 2013/2014 the number of students 300 people, and the study sample X.4 class as experiment class with (n = 30) applying cooperative learning model CIRC and class X.3 as class control the number of students (n = 32) whithout using cooperative learning model CIRC. Testing the hypothesis t-test of the right-hand side. The results of the analysis of data obtained average scores on the experimental class = 76.90 and 60.81 for the control class normaly distibuted both classes and has variance (F test) are homogeneous. Tesing hypothesis obtained tcount t-test = 4.73 > ttabel = 1.67 with a significance level (α) = 0.05. The results showed that the application of cooperative learning model CIRC gives the positive effect on student learning outcomes in the atomic structure subject and the periodic table of elements (H0 rejected H1 is accepted)

Biocharcoal dari Kulit Kakao (Theobroma Cacao L)Untuk Mengadsorpsi Ion Logam Timbal Pb

Cacao is a commodity crop growth in the plantation farmers, particularly in Central Sulawesi. Processed of the cocoa fruits are mainly as the food products. Furthermore, the cocoa bark just become rubbish. This study aims to utilize the waste of cocoa bark to be used as biocharcoal to adsorb lead metal ions. The method used was spectrophotometry, where the lead ions concentration absorbed was measured using a Spectrodirect spectrophotometer. The results showed that at the optimum contact time 90 minutes, the lead ion capacity adsorption was 97% and the lead weight adsorbed was 25.26 mg/g. The optimum weight of 60 mg, where the lead ions capacity adsorption was 96.88% and the lead weight adsorbed was 25.22 mg/g. The optimum adsorption capacity was 40 ppm, where the lead ions adsorption obtained was 99.61% and the lead weight adsorbed was 10.84 mg/g

Model Pembelajaran Kooperatif Tipe Stad (Student Teams Achievement Division) Dikombinasikan dengan Media Animasi pada Materi Laju Reaksi Kelas XI SMA Negeri 1 Palu

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

Penerapan Metode Pembelajaran SQ3R Berbantuan Internet terhadap Hasil Belajar Siswa Kelas X pada Materi Sistem Periodik Unsur di SMA Labschool Palu

Internet is a global network connecting thousands and even millions of computer networks with a personal computer so that the user can obtain a variety of information from wider sources. This internet service is used to assist the implementation of the SQ3R learning method that is expected to enrich the literature. The SQ3R learning method is a method of learning which uses the reading technique intensively and rationally to understand the main ideas, the details of a reading, and a comprehensive understanding of a passage with the steps i.e. surveying, asking, reading, communicating, and reviewing. The aim of this study was to determine the effect of the implementation of SQ3R learning method internet-assisted to the learning outcomes (cognitive) of students in the class X on the material periodic table of elements at Senior High School Labschool Palu. This research was a quasi-experimental with non-randomized pre-test and post-test control groups design. This research was carried out by holding two groups of class X science 1 as the control group (n = 19) and Class X science 2 as the experimental group (n = 18).Testing of research data used t-test statistical analysis one side (right side) with the prerequisite tests: normality and homogeneity tests. The results of the data analysis obtained the average value (X1 ) of experiment class was 83.94 with a standard deviation of 8.24 and (X1 ) of control class was 77.78 with a standard deviation of 8.54. Results of the hypothesis testing using statistical t-test one side (right side) obtained tcount>ttable value was 1.867 > 1.690 with a confidence level (α) = 0.05 and a degree of freedom (df ) = 35. Based on the results of hypothesis testing, then Ho is rejected and H1 is accepted so it can be concluded that the SQ3R learning method internet-assisted on the material Periodic System of Elements has a positive influence on the learning outcomes of students in the class X at Senior High School Labschool Palu

Pemanfaatan Ampas Tahu sebagai Bahan Baku Pembuatan Biodiesel

Biodiesel is an alternative raw material for fuel of diesel motor made from vegetable oil. This study attempted to utilize tofu dregs as raw material for biodiesel. This study aimed to determine the yield of biodiesel produced and the content of methyl esters in the biodiesel yield, and to analyze the quality of biodiesel produced based on Indonesian national standard (SNI). This study consisted of four stages: the provision of samples, pre-treatment, esterification and transesterification, and analysis of the quality of biodiesel produced which include the density at 15 °C, the viscosity at 40 °C, and the moisture content. The results showed that the yield of biodiesel was 4.01%, and the content of methyl ester shown by larger Rf (0.87) using eluent of hexane:diethylether:formic acid. Results of the analysis of biodiesel quality obtained the density at 15°C was 864 kg/m3, the viscosity at 40 °C was 2.57 mm2/s, and the water content was 4%. Based on the parameters ofthe density at 15 °C and the viscosity at 40 °C, the product of biodiesel met the requirements of SNI, while in term of the water content the product did not meet the requirements of SNI

Biocharcoal dari Serbuk Gergaji Kayu Cempaka (Elmerrillia Ovalis Miq) Serta Daya Adsorpsinya pada Zink dan Tembaga

Cempaka wood is a typical wood in Sulawesi Island and Maluku archipelago. This wood can be used for wood industry particularly for the manufacture of furniture. However, not only furniture can be produced from the wood but also the sawdust as the waste. This research utilized the sawdust of cempaka wood as biocharcoal to adsorb zinc and copper ions included in liquid organic fertilizer complement based on variation of weight and concentration of biocharcoal. The method used in this study was the spectrophotometry spectroDirect with sawdust of cempaka wood as the adsorbent. The results showed the characteristic of water content of biocharcoal was 4.05% while ash content was 7.75%. The optimum weight of biocharcoal to adsorb zinc ions was 40 mg with the adsorption capacity of 19.97 mg/g while for copper ions was 60 mg with the adsorption capacity of 16.16 mg/g. The optimum concentration of zinc and copper ions than can be adsorbed was 60 ppm with the adsorption capacity of 11.80 mg/g for copper ion and 9.29 mg/g for zinc ion

Analisis Kalium, Kalsium dan Natrium dalam Buah Merah (Pandanus Baccari) Asal Kabupaten Poso sebagai Alternatif Peluruh Batu Ginjal

Red fruit (pandanus baccari) founded in Poso District was not familiar by many people. Red fruit contains chemicals that can be used as a traditional medicine for a wide variety of treatments. The purposes of this study were to analyze the content of potassium, calcium, and sodium in the extract of red fruit, and the solubility of calcium in the extract. Concentration of the extract was varied to 1%, 2%. 4%, and 6% to test the solubility of the calcium. Solubility of calcium in the extract of red fruit was determined by using atomic absorption spectrophotometer (AAS). The results showed that the extract of red fruit contained 30.35 ppm, 58.24 ppm, and 50.00 ppm of potassium, calcium, and sodium, respectively. Results of the solubility test of calcium in the extract showed that higher the concentration affected to the greater solubility. This can be seen from the difference between the lowest concentrations to the highest concentration in a row at 29.446 ppm, to 78.856 ppm, to 189.446, to 285.016 ppm. Thus it can be concluded that the extract of red fruit was possible to dissolve kidney stones

Arang Eceng Gondok (Eichornia Crassipes) sebagai Adsorben Fenol pada Limbah PLTU Palu

This study aims to determine the optimum capacity and weight of water hyacinth aroma to the adsorption capacity of phenol in Palu PLTU waste. The steps taken in this research are a sampling of PLTU waste, making of adsorbent, determination of phenol concentration in PLTU waste and determination of phenol concentration at equilibrium using a Spektrodirect spectrophotometer. The adsorption capacity of water hyacinth at optimum condition of phenol was determined by weight variations of 10, 20, 30, 40 and 50 mg. The resulting result after adsorption process for adsorption weight at the weight of charcoal 10 mg = 82.78%, 20 mg = 89.13%, 30 mg = 85.49%, 40 mg = 79.72% and 50 mg = 74, 42 %. The optimum weight of charcoal in phenol absorb is 20 mg with% phenol which is absorbed 89.13%. The capacity of adsorbent hailing of water hyacinth scent at optimum condition of 3.03 mg phenol/g of adsorbent

Pengaruh Ekstrak Seledri (Apium Graveolens L.) terhadap Kelarutan Kalsium dalam Batu Ginjal

Celery (apium graveolens L.) contains chemicals that can be used as traditional medicine for various treatments. The research objective is to determine the effect of celery (apium graveolens L.) extractsin dissolving calcium kidney stones and calcium to determine the relationship between the concentration of extract of celery (apium graveolens L.) with the solubility of calcium in the kidney stones. Determination of the solubility of calcium in an extract of celery is by flame fotometer. The concentration of the extract was varried into 1, 5, 10, 15 and 20%. It showed that a concentration of 1% can dissolve the calcium as much as 15.104%; concentration of 5% can dissolve the calcium as much as 18.708%; concentration of 10% can dissolve the calcium as much as 23.683%; concentration of 15% can dissolve the calcium as much as 28.869%; and to a concentration of 20% can dissolve the calcium as much as 35.048%. It can be concluded that celeries extract can dissolve calcium of kidney stones

Penentuan Kadar Kalium (K) Dan Kalsium (Ca) Dalam Labu Siam (Sechium Edule) Serta Pengaruh Tempat Tumbuhnya (Determination of Potassium (K) and Calcium (Ca) Content in Chayote (Sechium Edule) and the Effects with Its Growth Soil)

Chayote (sechiumeaite) is an alternative source of vegetable which is consumed largely by the community. For that reason, the research was conducted to determine the content of potassium (K) and calcium (Ca) as wll as its relation to the growth soil. The method of this research is laboratory experiments by using atomic absorption spectrometry. The result shows that the content of potassium in Palolo's chayote meat is 134.35 mg/100 g, skin and fruit meat is 269.10 mg/100 g, and in the ground is 34.02 mg/100 g. However, in Kebun Kopi's pumpkin, the content of potassium (K) is 177.42 mg/100 g in its fruit meat, 298.35 mg/100 g in its skin and fruit meat, and 88.02 mg/100 g in the soil. On the other hands the content of calcium obtained as follows: in Palolo's chayote meat is 38.53 mg/100 g, in the skin and fruit meat is 55.865 mg/100 g, and in the soil is 32.72 mg/100 g. In the area of Kebun Kopi's chayote meat is 20.535mg/100 g, in the skin and fruit meat is 30.605 mg/100 g, and in the soil is 7.682 mg/100 g. Therefore, the content of potassium and calcium obtained is higher than in the literature