Jurnal Akademika Kimia
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Effect of Problem Based Learning Model on the Chemical Reaction Rate toward Critical Thinking Ability of Students
Get PDFThis study aimed to identify the effect of the problem-based learning model on the reaction rate toward critical thinking abilities of students of MAN 1 Palu. This study was a quasi-experiment with a pretest-posttest control group design. Sampling was taken by purposive sampling technique with the sample of class XI MIA 3 as the experimental group (n = 18) and class XI MIA 4 as the control group (n = 14). The results of the study and data analysis obtained an average value of students' critical thinking skills from the questionnaire that the experimental group was 82.95%, higher than the control group (73.43%). The average value of students' critical thinking skills from the description test showed that the experimental group was 79.42%, higher than the control group (58.02%). Students' critical thinking skills data using parametric statistical analysis with t-test (right-party t-test) obtained tcount > ttable was 6.83 > 2.04 which corresponds to the H1 acceptance area, therefore H1 was accepted and H0 rejected. This means that students 'critical thinking skills in the experimental group were higher than in the control group. The results of this study concluded that the problem-based learning model had a significant influence on the thinking ability of students in grade XI on the reaction rate at MAN 1 Palu
Analysis of Flavanoids in Flour and Biscuit based on Chayote
Get PDFChayote-based flour and biscuits are the development of healthy food products that contain flavonoid compounds that can be used to protect and reduce skin damage to UV rays. This study aimed to determine the flavonoid content in chayote-based flour and biscuits using the AlCl3 method with a UV-Vis spectrophotometry at a wavelength of 520 and 700 nm. The results obtained the flavonoid levels in chayote-based flour and biscuits of 0.325±0.011 mg/L and 0.117±0.023 mg/L or equivalent to 0.812±0.028 mg/100 gram and 0.291±0.058 mg/100 gram. This study concluded that chayote-based flour and biscuits contained flavonoids can be used as a source of antioxidants and a source of beneficial nutrition
Sparkol Videoscribe Usage on Colloid Material as a Media for Chemistry Education
No full textThis research method was research and development (R & D), which purposed to obtain the sparkol videoscribe designs of colloidal material and the validity of designs that were reviewed by experts as theoretical experts. The object of this study was sparkol videoscribe. Data collection was divided into two, namely media design data and media validity that were designed by using assessment sheets from 5 experts, 3 people were the learning media experts and 2 people were the chemical material experts. Data were analyzed descriptively to determine the justification of the validity of the research object. The results of the data analysis obtained that sparkol videoscribe design of material colloid had characteristics, namely images, moving hand animation, music, explanation of material in the form of sound and the composition of sentences incorporated in whiteboard animation. The designs were declared valid with a very good category according to experts and can be used as a chemistry education media with a score of 3.7 based on the total score of the instructional media experts and 3.45 based on the total score of the chemical material experts
Analysis of Student Conception of Atomic Structure at the State SMA in Palu
Get PDFThis study aimed to analyze student’s knowledge (percent) for who know concept (KC), misconception (MC), and do not know concept (DKC) on the subject of atomic structure at the state SMA in Palu. The sample of this study were students of SMAN Model Terpadu Madani, SMAN 3, and SMAN 9. Data were obtained through tracer tests of students’ conception in the form of multiple-choice consisted of 20 items accompanied by CRI (Certainty of Response Index) which was given to students to determine students' conceptions. Results of the study showed that the percentage of KC, MC, and DKC at SMAN Madani Model Palu were 65.6, 11.3, and 23.2% respectively, while at SMAN 3 Palu were 46.0, 15.1, and 38.9% respectively, and at SMAN 9 Palu were 5.9, 72.6, and 21.5% respectively
The Effect of Practical Learning on Creative Thinking Skills of High School Students on Acid-Base
Get PDFThis study aims to determine the effect of practical learning on the creative thinking skills of class XI students on acid-base material at SMAN 7 Palu. This type of research was a quasi-experimental research with equivalent control group design. Sampling in this study was a purposive random sampling technique. The sample consisted of two classes students in XI MIA 2 as the experimental class (n = 24) and students in class XI MIA 4 as the control class (n = 24). Data from students' creative thinking using the one-party hypothesis testing, the right side were in this study used the statistics application and obtained sig. (2-tailed) 0,000 data based on this decision, the hypothesis is accepted if the sig (2-tailed) value is smaller than 0.05 so that it can be concluded that there is a positive effect using practical learning on the creative thinking ability of class XI students on acid-base material at SMAN 7 Palu
The Booklet Development of Inorganic Fertilization System Based on Problem
Get PDFThe use of inorganic fertilizer in the tillage was mostly used by Sikkanese. The reason was the large supply of inorganic fertilizer on the market, fast response, easy to absorb, and not to waste times. In the implementation, inorganic fertilizer was not used accordance with the stipulation of the four rights (4T): right dose, right time, right place, and right source. The result was the decrease of soil quality and the death of soil-degrading microorganisms so that the soil became infertile. Therefore, the booklet as a learning media gave the right information about the proper fertilization system. The research aims to know the appropriateness of the booklet development of inorganic fertilization system. The method used was the research and development (R n D) method by adopting a Borg and Gall model. The sample was taken by using purposive sampling. The analysis technical was validity analysis (valid percentage) and appropriate analysis (Widoyoko categorial). The result of the study showed that the booklet was appropriated to use as a medium of information for the farmer with the feasibility category both at the initial field trial and field trial stages. Furthermore, in the field trial implementation, the booklet was suitable to use with the very good feasibility category
The Implementation of Two Strength Method on the Topic of Chemical Equilibrium toward Learning Outcomes of Students in 11th Grade Science at SMA Negeri 1 Sindue on Academic Year 2016-2017
Get PDFThis study aimed to determine the differences of students’ learning outcomes between the class implementing the two strenght method and the class with the lecture method on the topic of chemical equilibrium in 11th grade science at SMA Negeri 1 Sindue on academic year 2016-2017. This type of study was a quasi experiment with a non-randomized pretest-posttest control group design. The sample of this study consisted of two classes namely students of class XI science 3 as the exsperimental class (n = 30) and students of class Xl science 2 as the control class (n = 30). Data of students’ learning outcomes were analyzed using t-test statistic of two-party. The analysis obtained the everage scores of the experimental and the control class were 50.50 with a standard deviation of 9.79 and 41.03 with a standard deviation of 11.01. Result of the hypothesis test with t-test statistic of two-party obtained –ttable ≤ tcount ≥ + ttable (tcount = 2.35 and ttable = 2.00) with a significance level of 0.05 and degree of freedom of 58 then H0 was rejected and H1 was accepted. This study concludes that there is difference in students’ learning outcomes between class with the implementation of the two strength methods and class with the lecture method on the topic of chemical equilibrium in 11th grade science at SMA Negeri 1 Sindue on academic year 2016-2017
Effectiveness of Problem Solving Learning Model towards Student Learning Outcomes on Acid-Base Solution in SMA Negeri 1 Buko on Academic Year 2018-2019
Get PDFThis study aimed to determine the effectiveness of problem-solving learning models on students’ learning outcomes in the acid-base solutions topic in SMA Negeri 1 Buko on Academic Year 2018-2019. This type of research was a true experiment with a non-randomized posttest two group design. The population of this research was all students of class XI MIA, the sampling techniques was saturated sampling methods. The sample used was students of class XI MIA 1 and XI MIA 2 as experimental class 1 and experimental class 2. The testing of students’ learning outcomes data was using one-party statistical analysis t-test to test the completeness of individual learning outcomes and classical completeness test to test the overall percentage of mastery learning. The results of data analysis obtained, the mean experimental class 1 (X1) was 75.5 with a standard deviation of 10.71 and the average experimental class 2 (X2) was 76.43 with a standard deviation of 12.77. The results of hypothesis testing with one-party t-test statistics in the experimental class 1 and 2 was obtained tcount > ttable (2.321 > 1.740; 2.306 > 2.101) with a significance level of α = 0.05 and degrees of freedom 18 and 19, then H0 was rejected and Ha was accepted. Then, the result of the classical completeness test obtained in the experimental class 1 were 80% and experimental class 2 were 80.95%. Based on the results of data analysis it can be concluded that the problem-solving learning model is effective against students’ learning outcomes in the acid-base solutions topic in SMA Negeri 1 Buko on Academic Year 2018-2019
Flower Extracts of Cage Plants (Canavalia virosa) as an Indicator of Acid Base
Get PDFCage plants (Canavalia virosa) are classified as nuts. This study aims to prove the flowers of the cage plants as acid-base indicators and determine the type of acid-base titration that is suitable for indicators of cage plants. The flowers of the cage plants were macerated with ethanol. Extras were tested as indicators in acid-base solutions, buffer solutions, and compared with phenolphthalein and methyl orange for acid-base titration, namely: strong acid with a strong base, a weak acid with a strong base, and weak base with strong acid. The results obtained in this study, namely: flower extracts of cage plants in strong red acid, in weak acid pink, in strong green bases, and weak bases in light green. In a buffer solution of pH 1 to pH 11, the flower extract of the cage plants gives 4 color groups, namely: a buffer solution with pH 1 colored red, pH 3 colored pink, pH 5 to pH 9 being light green, and pH 11 being dark blue. Cage plant flower extract can be used as an indicator of acid-base, cage plant flower extract can be used on strong-base strong acid titration, strong weak-acid base, and weak-strong base acid titration
Misconception Reduction by Implementing Contextual Teaching and Learning (CTL) Approach on Salt Hydrolysis Material in Grade XI at SMA 1 Palasa
Get PDFMisconception is a conception of someone who is not in accordance with the scientific concept recognized by experts. Student’s who experience misconceptions will make mistakes in understanding concept’s and occur continuously. This study aimed to determine the percentage of reduction of students’ misconception in grade XI SMA 1 Palasa on salt hydrolysis by implementing contextual teaching and learning (CTL) approach. This study was a quantitative descriptive study with the number of samples of 2 classes, that’s Class XI Science A consisted of 22 students, and Class XI Science B consisted of 22 students. The instrument test was a reasoned multiple choice test accompanied by a certainty of response index (CRI) consisting of 20 items. The results showed that the percentages of the average reduction of students’ misconceptions in the class XI science A and in the class XI science B on salt hydrolysis with contextual teaching and learning (CTL) approach were 19.6 and 9.8%, respectively