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All Journal Jurnal Akademika Kimia
Tiwow, Vanny M.A.
Universitas Tadulako

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Pengaruh Model Pembelajaran Kooperatif Tipe NHT (Numbered Heads Together) Terhadap Hasil Belajar Siswa Kelas XI IPA SMA Negeri 1 Dolo Pada Materi Pelajaran Kimia Koloid Febiliyanti, Rezha; Tiwow, Vanny M.A.; Gonggo, Siang Tandi
Jurnal Akademika Kimia Vol 3, No 2 (2014)
Publisher : Universitas Tadulako

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Abstract

This research is motivated by low achievement and lack of chemistry students in learning activities especially on the subject of colloids. Based on observations in SMA Negeri 1 Dolo, it has known that the process of teaching and learning suggests that teachers in teaching chemistry concepts and theories through learning activities centered on the teacher or just direct instruction, students were not actively engaged in activities and less opportunity to develop the students thinking process, so the learning process tends boring and turned to student learning laziness. These problems could be overcome by using a type of learning model NHT (Numbered Heads Together). This study aims to figure out the Effects of Cooperative Learning Model Type NHT (Numbered Heads Together) on Student Results of Class XI IPA SMAN I Dolo on topic Colloids. The population in this study was the students of class XI SMA Negeri 1 Dolo 2012/2013 school year, and the research sample was 33 students of class XI IPA 3 as the experimental class (learning by using NHT), and 34 students of class XI IPA 2 as a control class (direct learning). Data were obtained by providing post-test to both samples group. After that, the data were analyzed to test the hypothesis by using one tail t-test. The average and the deviation standard obtained for the experimental class was 64.15 and 10.75. While the average and deviation standard for control class was 53,03 and 10,21. Based on t-test analysis, it can be concluded that the learning outcomes of students who use cooperative learning model NHT (Numbered Heads Together) is higher than student learning outcomes using direct instructional model.
PENGGUNAAN MODEL PEMBELAJARAN KOOPERATIF TIPE STAD (Student Teams Achievement Division) UNTUK MENINGKATKAN HASIL BELAJAR KIMIA POKOK BAHASAN LAJU REAKSI PADA SISWA KELAS XI IPA SMA NEGERI 7 PALU Angriani, Eva; Tiwow, Vanny M.A.; Tangkas, I Made
Jurnal Akademika Kimia Vol 2, No 4 (2013)
Publisher : Universitas Tadulako

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Abstract

The research was conducted at SMAN 7 Palu for the purpose to improving student learning outcomes of Chemistry through the use of Cooperative Learning Type STAD methods (Student Teams Achievement Division) on the chemistry subject of reaction rate. Population of this research was all students in class XI IPA SMA Negeri 7 Palu academic year 2012/2013, consisting of 3 classes. The sample were in class XI IPA 2 with total 34 students, as the experimental class that used cooperative learning STAD method and class XI IPA 1 with total 37 students as a control class (not used Cooperative learning STAD methods). The data were collected by using the test instrument. The data collecting result use the statistical analysis t-test with the prerequisite test for normality and homogeneity tests. The study shows that the mean value of student learning outcomes use cooperative learning STAD model is 7.66; the mean value of student learning outcomes without using cooperative learning STAD model was 5.57. Based on the hypothesis testing using statistical t-test in the right side earned value thitung > ttabel is 5.36 > 1.66 with degree of freedom = 0.05 and dk = 69. The results shows that the use of cooperative learning STAD model could improve learning outcomes of students in reaction rate of chemistry subject.
Distribusi Unsur Hara N dan P dalam Sedimen di Ekosistem Lamun (Seagrass) di Wilayah Pesisir Desa Kabonga Besar Kabupaten Donggala Silvia, Mega; Tiwow, Vanny M.A.; Said, Irwan
Jurnal Akademika Kimia Vol 3, No 2 (2014)
Publisher : Universitas Tadulako

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Abstract

This research aims to determine the distribution patterns and concentrations of nitrogen and phosphorus nutrients in the sediment at the coastal region of seagrass ecosystems Kabonga Besar village Donggala district. Phosphorus (P) and nitrogen (N) in water its are nutrient that is essential for the growth of phytoplankton. This research was carried out by quantitative analysis using a nitrogen compound Kjeldhal method which consists of three phases: destruction, distillation, and titration, while for phosphorus compound using UV-Vis spectrophotometric method. The results showed that the lowest levels of nitrogen were obtained at the level of fertility sea grass sediments are less abundant range of 0.05% - 0.06% , on the contrary sea grass abundant fertility rate which ranges from 0.07% - 0.09%. For the highest levels of phosphorus nutrients contained in the water that is abundant on sea grass fertility ranged from 4.335 - 4.387 mg/100, and the lowest was ranged from 2.292 - 2.358 mg/100. Based on the data obtained it can be concluded that the content of nitrogen and phosphorus nutrients in sediments sea grass at the research area was still relatively low, it could affect the growth of seagrass.