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PENGARUH MODEL PEMBELAJARAN INKUIRI TERBIMBING MENGGUNAKAN MEDIA SEDERHANA TERHADAP HASIL BELAJAR IPA FISIKA PADA SISWA KELAS VIII SMP NEGERI 3 PALU
Get PDFModel pembelajaran inkuiri terbimbing merupakan pembelajaran yang melibatkan siswa dalam menentukan suatu konsep atau materi pelajaran yang sedang dipelajari. Keterlibatan siswa dalam proses pembelajaran tersebut dapat berupa mengajukan berbagai pertanyaan, menghimpun informasi, dan melakukan penyelidikan. Pembelajaran langsung (DI) merupakan suatu model pembelajaran yang terdiri dari penjelasan guru mengenai konsep atau keterampilan baru terhadap siswa. Penelitian ini dilakukan dengan tujuan mengetahui pengaruh model pembelajaran inkuiri terbimbing menggunakan media sederhana terhadap hasil belajar IPA fisika pada siswa SMP Negeri 3 Palu. Jenis penelitian ini merupakan eksperimen kuasi dengan desain the non-equivalent pretest-posttest. Populasi penelitian adalah siswa kelas VIII SMP Negeri 3 Palu. Teknik Sampling yang digunakan dalam penelitian ini adalah purposive sampling dengan sampel penelitian adalah kelas VIII A sebagai kelompok eksperimen dan kelas VIII B sebagai kelompok kontrol. Instrumen hasil belajar IPA fisika berupa tes pilihan ganda yang telah divalidasi melalui validitas konstruksi. Hasil uji t dua pihak dengan dk = 60 dan taraf signifikansi a = 0,05 diperoleh nilai thitung = 3,92 dan nilai ini lebih besar dari ttabel = 2,00. Hal ini berarti, nilai thitung berada di luar daerah penerimaan H0. Dengan demikian H0 ditolak dan H1 diterima, dan dapat disimpulkan bahwa ada pengaruh model pembelajaran Inkuiri terbimbing menggunakan media sederhana terhadap hasil belajar IPA fisika pada siswa SMP Negeri 3 Palu.Model pembelajaran inkuiri terbimbing merupakan pembelajaran yang melibatkan siswa dalam menentukan suatu konsep atau materi pelajaran yang sedang dipelajari. Keterlibatan siswa dalam proses pembelajaran tersebut dapat berupa mengajukan berbagai pertanyaan, menghimpun informasi, dan melakukan penyelidikan. Pembelajaran langsung (DI) merupakan suatu model pembelajaran yang terdiri dari penjelasan guru mengenai konsep atau keterampilan baru terhadap siswa. Penelitian ini dilakukan dengan tujuan mengetahui pengaruh model pembelajaran inkuiri terbimbing menggunakan media sederhana terhadap hasil belajar IPA fisika pada siswa SMP Negeri 3 Palu. Jenis penelitian ini merupakan eksperimen kuasi dengan desain the non-equivalent pretest-posttest. Populasi penelitian adalah siswa kelas VIII SMP Negeri 3 Palu. Teknik Sampling yang digunakan dalam penelitian ini adalah purposive sampling dengan sampel penelitian adalah kelas VIII A sebagai kelompok eksperimen dan kelas VIII B sebagai kelompok kontrol. Instrumen hasil belajar IPA fisika berupa tes pilihan ganda yang telah divalidasi melalui validitas konstruksi. Hasil uji t dua pihak dengan dk = 60 dan taraf signifikansi a = 0,05 diperoleh nilai thitung = 3,92 dan nilai ini lebih besar dari ttabel = 2,00. Hal ini berarti, nilai thitung berada di luar daerah penerimaan H0. Dengan demikian H0 ditolak dan H1 diterima, dan dapat disimpulkan bahwa ada pengaruh model pembelajaran Inkuiri terbimbing menggunakan media sederhana terhadap hasil belajar IPA fisika pada siswa SMP Negeri 3 Palu
ANALISIS JENIS DAN KANDUNGAN LOGAM PADA BATUAN BUANGAN DARI PERTAMBANGAN EMAS POBOYA
Get PDFMetals has an important role for human life, especially in the industrial field. The purpose of this research is to find out the metal type and content in waste rock from the Poboya gold mine. The sampling technique is done by grabbing sampling, which is to take a lump of rock at a mining site. The analytical method used to determine the content and percentage of elements in rocks is XRF (X-Ray Fluorescence) spectrophotometry. The analysis results show that the metals contained in the waste rock from Poboya gold mining are Silicon (Si), Iron (Fe), Potassium (K), Aluminium (Al), Calcium (Ca), Titanium (Ti), Arsenic (As), Zirconium (Zr), Manganese (Mn), Strontium (Sr), Barium (Ba), Rubidium (Rb), Zinc (Zn), Niobium (Nb), Indium (In), Tin (Sn) and Stibium/Antimony (Sb). The highest percentage metals are Silicon 52.98% and Iron 23.56%. Based on these results, the high content of silica oxide and iron oxide in waste rock from Poboya has the potential as a basis to be used for making nano materials, especially nano silica and ferromagnetic materials.Metals has an important role for human life, especially in the industrial field. The purpose of this research is to find out the metal type and content in waste rock from the Poboya gold mine. The sampling technique is done by grabbing sampling, which is to take a lump of rock at a mining site. The analytical method used to determine the content and percentage of elements in rocks is XRF (X-Ray Fluorescence) spectrophotometry. The analysis results show that the metals contained in the waste rock from Poboya gold mining are Silicon (Si), Iron (Fe), Potassium (K), Aluminium (Al), Calcium (Ca), Titanium (Ti), Arsenic (As), Zirconium (Zr), Manganese (Mn), Strontium (Sr), Barium (Ba), Rubidium (Rb), Zinc (Zn), Niobium (Nb), Indium (In), Tin (Sn) and Stibium/Antimony (Sb). The highest percentage metals are Silicon 52.98% and Iron 23.56%. Based on these results, the high content of silica oxide and iron oxide in waste rock from Poboya has the potential as a basis to be used for making nano materials, especially nano silica and ferromagnetic materials
DETERMINATION OF TOTAL FLAVONOID LEVELS ON ALPUKAT FRUIT SKIN (PERSEA AMERICANA MILL.)
Get PDFAvocados (Persea americana Mill) are fruits that originally from Mexico and Central America. It has the characteristics of green flesh on the bottom of the skin and yellowing toward the seeds with a texture that is rather soft when it is ripe. Skin color varies, some are green because of chlorophyll or black content due to anthocyanin pigments. This study aimed to determine the total levels of flavonoids in the skin of avocados that were green and black. Determination of total flavonoid levels used a UV- Vis spectrophotometer. The results showed that an analysis of water content was 5.306% for green avocado skin and 7.327% for black avocado skin. The analysis of total flavonoid levels at a wavelength of 437 nm obtained respectively, the average yield was 54,950 mg/100g for green avocado skin and 29,519 mg/100g for black avocado skin. The results of this study are expected to be able to attract the interest of the community to cultivate green and black avocado plants. especially in the area of Central Sulawesi.Avocados (Persea americana Mill) are fruits that originally from Mexico and Central America. It has the characteristics of green flesh on the bottom of the skin and yellowing toward the seeds with a texture that is rather soft when it is ripe. Skin color varies, some are green because of chlorophyll or black content due to anthocyanin pigments. This study aimed to determine the total levels of flavonoids in the skin of avocados that were green and black. Determination of total flavonoid levels used a UV- Vis spectrophotometer. The results showed that an analysis of water content was 5.306% for green avocado skin and 7.327% for black avocado skin. The analysis of total flavonoid levels at a wavelength of 437 nm obtained respectively, the average yield was 54,950 mg/100g for green avocado skin and 29,519 mg/100g for black avocado skin. The results of this study are expected to be able to attract the interest of the community to cultivate green and black avocado plants. especially in the area of Central Sulawesi
ANALISIS MISKONSEPSI SISWA PADA MATERI GERAK LURUS
Get PDFPenelitian ini menggunakan pendekatan deksriptif kualitatif yang bertujuan untuk mengetahui miskonsepsi siswa kelas XI IPA 3 di SMA Negeri 5 Palu tentang gerak lurus. Penelitian ini dilakukan di SMA Negeri 5 Palu. Subyek penelitian adalah siswa XI IPA 3 yang terdiri dari 30 siswa. Instrumen yang di gunakan adalah tes pilihan ganda beralasan yang disertai dengan tingkat keyakinan dalam menjawab soal (Three-tier diagnostic test) berjumlah 18 butir soal. Hasil penelitian menunjukan bahwa tingkat miskonsepsi siswa dengan menggunakan Three-tier diagnostic test tergolong tinggi dengan rata-rata persentase 52,78% bila dibandingkan dengan jumlah rata-rata siswa yang tidak paham konsep yang mencapai 37,04% dan jumlah rata-rata siswa yang paham konsep mencapai 10,18%. Miskonsepsi disebabkan karena jawaban sudah sesuai dengan konsep ilmiah namun responden tidak yakin dengan jawaban dan ada beberapa responden hanya menerka jawaban serta tidak yakin dengan jawaban. Miskonsepsi dominan pada konsep tentang kecepatan lebih besar dan kecepatan paling besar.Penelitian ini menggunakan pendekatan deksriptif kualitatif yang bertujuan untuk mengetahui miskonsepsi siswa kelas XI IPA 3 di SMA Negeri 5 Palu tentang gerak lurus. Penelitian ini dilakukan di SMA Negeri 5 Palu. Subyek penelitian adalah siswa XI IPA 3 yang terdiri dari 30 siswa. Instrumen yang di gunakan adalah tes pilihan ganda beralasan yang disertai dengan tingkat keyakinan dalam menjawab soal (Three-tier diagnostic test) berjumlah 18 butir soal. Hasil penelitian menunjukan bahwa tingkat miskonsepsi siswa dengan menggunakan Three-tier diagnostic test tergolong tinggi dengan rata-rata persentase 52,78% bila dibandingkan dengan jumlah rata-rata siswa yang tidak paham konsep yang mencapai 37,04% dan jumlah rata-rata siswa yang paham konsep mencapai 10,18%. Miskonsepsi disebabkan karena jawaban sudah sesuai dengan konsep ilmiah namun responden tidak yakin dengan jawaban dan ada beberapa responden hanya menerka jawaban serta tidak yakin dengan jawaban. Miskonsepsi dominan pada konsep tentang kecepatan lebih besar dan kecepatan paling besar
ANALISIS KUALITAS AIR TANAH DI PETOBO
Get PDFThe purpose of this study was to determine groundwater quality based on parameters of pH, COD, and BOD levels. These parameters are in accordance with Government Regulation No. 82 the year 2001 that concern the management of water quality and control of water pollution. pH meter was used for pH measurement. For COD concentration, the titrimetric titration was used while the iodometric titration for BOD concentrations. The results showed that the pH value of water was 7.9, the COD level was 7.84 mg/L and the BOD level was 1.68 mg/L. According to Government Regulations No. 82 the year 2001, it states that the level of COD based on its class is 10 mg/L (class I), and BOD based on its class is 2 mg/L. Therefore, the result of the COD and BOD concentrations are below of class 1 standards, it means the groundwater quality for two parameters in the Petobo area is still suitable for daily use.The purpose of this study was to determine groundwater quality based on parameters of pH, COD, and BOD levels. These parameters are in accordance with Government Regulation No. 82 the year 2001 that concern the management of water quality and control of water pollution. pH meter was used for pH measurement. For COD concentration, the titrimetric titration was used while the iodometric titration for BOD concentrations. The results showed that the pH value of water was 7.9, the COD level was 7.84 mg/L and the BOD level was 1.68 mg/L. According to Government Regulations No. 82 the year 2001, it states that the level of COD based on its class is 10 mg/L (class I), and BOD based on its class is 2 mg/L. Therefore, the result of the COD and BOD concentrations are below of class 1 standards, it means the groundwater quality for two parameters in the Petobo area is still suitable for daily use
ANTIOXIDANT ACTIVITY TEST OF LIDAH MERTUA (SANSEVIERIA TRIFASCIATA P.) LEAVES EXTRACT USING 1,1-DIPHENIL-2-PIKRILHIDRAZIL
Get PDFAntioxidant activity test of lidah mertua (Sansevieria trifasciata P.) leaves extract using 1,1-diphenil-2-picrylhydrazyl has been carried out. The purpose of this study was to determine the antioxidant activity of ethanol extracts of old and young leaves of lidah mertua (Sansevieria trifasciata P.). The radical concentration of 1,1-diphenil-2-picrylhydrazyl (DPPH) after the addition of ethanol extracts of old and young leaves of lidah mertua was determined using a UV-Vis spectrophotometer. The concentrations used in the ethanol extracts of old and young leaves of lidah mertua were 20 ppm, 40 ppm, 60 ppm, 80 ppm and 100 ppm. The IC50 values obtained of ethanol extracts of old and young leaves of lidah mertua were 131.336 ppm and 144.568 ppm respectively, while IC50 value of vitamin C as a comparison was 65.433 ppm. It can be seen that the antioxidant ethanol extracts of old and young leaves of lidah mertua are moderate compared to vitamin C.Antioxidant activity test of lidah mertua (Sansevieria trifasciata P.) leaves extract using 1,1-diphenil-2-picrylhydrazyl has been carried out. The purpose of this study was to determine the antioxidant activity of ethanol extracts of old and young leaves of lidah mertua (Sansevieria trifasciata P.). The radical concentration of 1,1-diphenil-2-picrylhydrazyl (DPPH) after the addition of ethanol extracts of old and young leaves of lidah mertua was determined using a UV-Vis spectrophotometer. The concentrations used in the ethanol extracts of old and young leaves of lidah mertua were 20 ppm, 40 ppm, 60 ppm, 80 ppm and 100 ppm. The IC50 values obtained of ethanol extracts of old and young leaves of lidah mertua were 131.336 ppm and 144.568 ppm respectively, while IC50 value of vitamin C as a comparison was 65.433 ppm. It can be seen that the antioxidant ethanol extracts of old and young leaves of lidah mertua are moderate compared to vitamin C
PENGARUH PENGGUNAAN MEDIA PEMBELAJARAN VIRTUAL LAB BERBASIS ANDROID TERHADAP HASIL BELAJAR FISIKA SISWA KELAS VIII SMPN 3 PALU
Get PDFPenelitian ini bertujuan untuk mengetahui ada tidaknya pengaruh penggunaan media pembelajaran virtual lab berbasis android terhadap hasil belajar fisika siswa kelas VIII SMP N 3 Palu. Jenis penelitian yang digunakan adalah kuasi eksperimen dengan desain the non equivalent pretest-posttest design. Sampel penelitian yaitu kelas VIII-J sebagai kelas eksperimen dan kelas VIII-I sebagai kelas kontrol. Instrumen yang digunakan berupa tes hasil belajar dalam bentuk pilihan ganda yang telah divalidasi oleh validator. Dari analisis data, untuk kelas eksperimen diperoleh nilai rata-rata skor posttest adalah 9,57 dengan standar deviasi sebesar 3,35. Sedangkan kelas kontrol diperoleh nilai rata-rata posttest adalah 7,19 dengan standar deviasi sebesar 3,08. Berdasarkan uji hipotesis (uji-t dua pihak) diperoleh thitung = 2,69 dan t0,95(60) = 1,67 pada taraf nyata = 0,05. Hal ini berarti H0 ditolak dan H1 diterima. Dengan demikian dapat disimpulkan bahwa ada pengaruh penggunaan media pembelajaran virtual lab berbasis android terhadap hasil belajar fisika siswa kelas VIII SMP N 3 Palu.Penelitian ini bertujuan untuk mengetahui ada tidaknya pengaruh penggunaan media pembelajaran virtual lab berbasis android terhadap hasil belajar fisika siswa kelas VIII SMP N 3 Palu. Jenis penelitian yang digunakan adalah kuasi eksperimen dengan desain the non equivalent pretest-posttest design. Sampel penelitian yaitu kelas VIII-J sebagai kelas eksperimen dan kelas VIII-I sebagai kelas kontrol. Instrumen yang digunakan berupa tes hasil belajar dalam bentuk pilihan ganda yang telah divalidasi oleh validator. Dari analisis data, untuk kelas eksperimen diperoleh nilai rata-rata skor posttest adalah 9,57 dengan standar deviasi sebesar 3,35. Sedangkan kelas kontrol diperoleh nilai rata-rata posttest adalah 7,19 dengan standar deviasi sebesar 3,08. Berdasarkan uji hipotesis (uji-t dua pihak) diperoleh thitung = 2,69 dan t0,95(60) = 1,67 pada taraf nyata = 0,05. Hal ini berarti H0 ditolak dan H1 diterima. Dengan demikian dapat disimpulkan bahwa ada pengaruh penggunaan media pembelajaran virtual lab berbasis android terhadap hasil belajar fisika siswa kelas VIII SMP N 3 Palu
PEMANFAATAN SERBUK GERGAJI KAYU JATI (TECTONA GRANDIS L.F) SEBAGAI ADSORBEN LOGAM CU (II)
Get PDFSawdust is one of the industrial wastes that can be used as an absorbent. The chemical content in sawdust is the same as in its wood, i.e lignin, cellulose, and hemicellulose. This study aimed to determine the optimum contact time, optimum weight, and adsorption capacity of Cu (II) ions by teak sawdust using the atomic absorption spectrophotometry (AAS). Determination of optimum contact time was carried out with time variations of 10, 30 and 60 minutes, the optimum weight with various weight of 0.5, 1, and 1.5 grams, and the adsorption capacity of teak sawdust in various concentrations of 50, 100, 150 and 200 ppm. The results showed that the equilibrium contact time was reached at 30 minutes, and the percentage of adsorption of Cu (II) was 91.25%. The optimum weight for metal adsorption was 1.5 gram, and the adsorption percentage of adsorbed Cu (II) ions was 96.18%. The adsorption capacity was determined from the adsorption isotherm according to the Langmuir and the freundlich models. The adsorption isotherm model of Cu (II) of teak sawdust follows the Langmuir isotherm model with a maximum adsorption capacity (qmax) of 2.058 mg/g.Sawdust is one of the industrial wastes that can be used as an absorbent. The chemical content in sawdust is the same as in its wood, i.e lignin, cellulose, and hemicellulose. This study aimed to determine the optimum contact time, optimum weight, and adsorption capacity of Cu (II) ions by teak sawdust using the atomic absorption spectrophotometry (AAS). Determination of optimum contact time was carried out with time variations of 10, 30 and 60 minutes, the optimum weight with various weight of 0.5, 1, and 1.5 grams, and the adsorption capacity of teak sawdust in various concentrations of 50, 100, 150 and 200 ppm. The results showed that the equilibrium contact time was reached at 30 minutes, and the percentage of adsorption of Cu (II) was 91.25%. The optimum weight for metal adsorption was 1.5 gram, and the adsorption percentage of adsorbed Cu (II) ions was 96.18%. The adsorption capacity was determined from the adsorption isotherm according to the Langmuir and the freundlich models. The adsorption isotherm model of Cu (II) of teak sawdust follows the Langmuir isotherm model with a maximum adsorption capacity (qmax) of 2.058 mg/g
PEMANFAATAN SERBUK GERGAJI SEBAGAI BAHAN BAKU BRIKET
Get PDFWood sawdust is one of the wastes from wood processing industry such as sawdust and peel residues. They are cheap raw materials and potential as a source of alternative energy by processing it into charcoal briquettes. The use of charcoal briquettes as a substitute for fossil energy sources has several advantages including the relatively less smoke emitted because it has been released during the carbonization process. They can be stored for a long time and the calor value is higher than wood. Charcoal briquettes are made from wood sawdust which is added by tapioca flour as glue. This study was conducted in two main stages, processing charcoal briquette and characterization. The characterization of charcoal briquettes are including density, moisture, ash, volatile substances levels, carbon bound, long flame and calor value. The results obtained from the charcoal briquettes are a density of 0.384 gr/cm3, a moisture of 2.44%, an ash of 4.82%, a volatile substance of 19.13%, a carbon bond of 74.44%, a briquette flame of 6.75 minutes/gr and the calor value of 5127 cal/gr. This study concluded that wood sawdust briquette has the potential to be used potentially as substitued for fuel.Wood sawdust is one of the wastes from wood processing industry such as sawdust and peel residues. They are cheap raw materials and potential as a source of alternative energy by processing it into charcoal briquettes. The use of charcoal briquettes as a substitute for fossil energy sources has several advantages including the relatively less smoke emitted because it has been released during the carbonization process. They can be stored for a long time and the calor value is higher than wood. Charcoal briquettes are made from wood sawdust which is added by tapioca flour as glue. This study was conducted in two main stages, processing charcoal briquette and characterization. The characterization of charcoal briquettes are including density, moisture, ash, volatile substances levels, carbon bound, long flame and calor value. The results obtained from the charcoal briquettes are a density of 0.384 gr/cm3, a moisture of 2.44%, an ash of 4.82%, a volatile substance of 19.13%, a carbon bond of 74.44%, a briquette flame of 6.75 minutes/gr and the calor value of 5127 cal/gr. This study concluded that wood sawdust briquette has the potential to be used potentially as substitued for fuel
POLYMERIZATION OF EUGENOL USING A CONCENTRATED NITRIC ACID (HNO3) CATALYST AND MEDIA OF ACETIC ACID (CH3COOH)
Get PDFEugenol is a paleyellow oily liquid which can be extracted from essential oils such as clove and cinnamon oils. This study aimed to modify eugenol and to reduce environmental pollution caused by polymers by utilizing natural materials through polymerization of eugenol with concentrated nitric acid (HNO3) and media of acetic acid (CH3COOH). Various of acetic acid media used were 5%, 25%, and 50%. The result of polieugenol was blackish brown, in the form of shiny gels, smelling of cloves, and soluble in ethanol, slightly soluble in chloroform and insoluble in benzene and water. The product polieugenol was washed with aquades. The yields before washing were 142.75%, 141.25% and 138.75%, and the yield after washing were 88.265%, 88.397% and 87.248%. The Fourier Transform InfraRed (FT-IR) spectrophotometer results showed that the polymerization did not occur perfectly showing by absorption peaks of CH=CH2 and C = C groups at 995.27 and 1635.89 cm-1.Eugenol is a paleyellow oily liquid which can be extracted from essential oils such as clove and cinnamon oils. This study aimed to modify eugenol and to reduce environmental pollution caused by polymers by utilizing natural materials through polymerization of eugenol with concentrated nitric acid (HNO3) and media of acetic acid (CH3COOH). Various of acetic acid media used were 5%, 25%, and 50%. The result of polieugenol was blackish brown, in the form of shiny gels, smelling of cloves, and soluble in ethanol, slightly soluble in chloroform and insoluble in benzene and water. The product polieugenol was washed with aquades. The yields before washing were 142.75%, 141.25% and 138.75%, and the yield after washing were 88.265%, 88.397% and 87.248%. The Fourier Transform InfraRed (FT-IR) spectrophotometer results showed that the polymerization did not occur perfectly showing by absorption peaks of CH=CH2 and C = C groups at 995.27 and 1635.89 cm-1