KIMIKA最新文献 - Book学术

Development and Rasch Analysis of the Prior Knowledge of Chemistry Concepts Test for Pre-medical Students in the Philippines 菲律宾医学预科生化学概念先验知识测试的开发与拉希分析

KIMIKA Pub Date : 2024-01-08 DOI: 10.26534/kimika.v34i2.14-33

Jonathan Barcelo

{"title":"Development and Rasch Analysis of the Prior Knowledge of Chemistry Concepts Test for Pre-medical Students in the Philippines","authors":"Jonathan Barcelo","doi":"10.26534/kimika.v34i2.14-33","DOIUrl":"https://doi.org/10.26534/kimika.v34i2.14-33","url":null,"abstract":"Chemistry concepts are embedded in several contexts that are related to the future professional roles of pre-medical students. In the current academic landscape of pre-medical programs, an objective measurement of prior knowledge of chemistry concepts is necessary to promote students’ academic success. To address this issue, this study aimed to develop and validate the Prior Knowledge of Chemistry Concepts Test. This multiple-choice research instrument is designed to measure pre-medical students’ knowledge of essential chemistry concepts from pre-requisite chemistry courses in pre-medical programs in the Philippines. The final item pool, consisting of 26 general chemistry concepts and 21 general organic chemistry concepts was administered to 470 college students from four tertiary institutions in the Philippines. Item content validity indices (I-CVI) and kappa statistics guided initial revisions, while dichotomous Rasch analysis was utilized to determine the psychometric properties of the research instrument. The analysis provided evidence of adequate person and item reliability, item fit, local independence, and unidimensionality, although some items may be omitted in subsequent iterations. The application of the research instrument to assessment and evaluation was elaborated using the student ability and item difficulty logits along the person-item map. Suggestions for the improvement of the research instrument were also discussed.","PeriodicalId":17914,"journal":{"name":"KIMIKA","volume":"25 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139444868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Feasibility of An Introductory Chemistry for Cultural Heritage E-course for Museum Professionals in the Philippines 菲律宾博物馆专业人员开设文化遗产化学入门电子课程的可行性

KIMIKA Pub Date : 2023-05-29 DOI: 10.26534/kimika.v34i1.15-20

Jan-Michael Cayme, Aniano Jr. Asor, E. Miranda

引用次数: 0

Improving the Least Mastered Competencies of Grade 11 Students in General Chemistry using Electronic Strategic Intervention Material (E-SIM) 利用电子策略干预材料(E-SIM)提高高二学生普通化学的最低掌握能力

KIMIKA Pub Date : 2022-12-30 DOI: 10.26534/kimika.v33i2.59-76

Gwyneth Rosal, Jhan Cromwell Aguinaldo, Lean Donnie Reyes, Gabriel Harold Casuat, Romalyn Balagtas, Erickson Del Mundo

{"title":"Improving the Least Mastered Competencies of Grade 11 Students in General Chemistry using Electronic Strategic Intervention Material (E-SIM)","authors":"Gwyneth Rosal, Jhan Cromwell Aguinaldo, Lean Donnie Reyes, Gabriel Harold Casuat, Romalyn Balagtas, Erickson Del Mundo","doi":"10.26534/kimika.v33i2.59-76","DOIUrl":"https://doi.org/10.26534/kimika.v33i2.59-76","url":null,"abstract":"Students perceive chemistry as a complex subject resulting in low academic performance. Education systems shall support students in bridging the gap between traditional learning and online set-up using technology-based materials. The Electronic Strategic Intervention Material (E-SIM) is a new learning method to help improve the learner’s performance in the least mastered competencies. This study focuses on determining how the E-SIM for “Ganyan Ang Bonding” (in English: Bonding Goes Like This) topic will improve the Grade 11 students’ knowledge about chemical bonding. The researchers used a one-group pretest-posttest control design. The population was pooled using simple random sampling and out of the randomly selected sections, twenty-two students were qualified after the voluntary response sampling. Pretest and posttest, which underwent validation, were given before and after the intervention respectively. The material was validated by experts prior to its utilization. The analysis showed a 0.01 normalized gain score, which is confirmed by the paired sample t-test with a result of -3.17 and p-value of 0.0023, hence presenting that there is a significant increase between the pretest and posttest scores. The student perception survey was used to further determine the efficiency of the material, which showed that the students perceived the E-SIM as an effective tool as review material.","PeriodicalId":17914,"journal":{"name":"KIMIKA","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79832788","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Predicting The Toxicity of Emerging Pollutants via Molecular Docking: Interaction of Polyhalogenated Carbazoles with Human Androgen Receptor 通过分子对接预测新出现污染物的毒性:多卤代咔唑与人类雄激素受体的相互作用

KIMIKA Pub Date : 2022-11-03 DOI: 10.26534/kimika.v33i2.1-20

Ma. Juryst Chelsea Armas, D. Apodaca

{"title":"Predicting The Toxicity of Emerging Pollutants via Molecular Docking: Interaction of Polyhalogenated Carbazoles with Human Androgen Receptor","authors":"Ma. Juryst Chelsea Armas, D. Apodaca","doi":"10.26534/kimika.v33i2.1-20","DOIUrl":"https://doi.org/10.26534/kimika.v33i2.1-20","url":null,"abstract":"Polyhalogenated carbazoles (PHCZs) are persistent chemical pollutants increasingly detected in different environmental matrices. They are structurally and chemically similar to other persistent organic pollutants (POPs), which are capable of disrupting the endocrine systems. However, PHCZs such as 3-chloro-9H-carbazole (3-CCZ), 3-bromo-9H-carbazole (3-BCZ), and 36-dibromo-9H-carbazole (36-BCZ) are rarely discussed in the context of their adverse effects on human health. Using molecular docking to investigate the potential toxicity of these PHCZs with the human androgen receptor (AR), this study finds that 36-dibromo-9H-carbazole and 3-bromo-9H-carbazole are potential AR antagonists, with the former being more toxic than the latter. This finding is on account of the presence of both Asn705 and Thr877 in the hydrophobic interaction of 36-BCZ, while only Thr877 is found in the hydrophobic interaction of 3-BCZ. Hence, PHCZs with higher bromine substitutions are more likely to be endocrine disruptors. Moreover, their binding sites with the human androgen receptor are similar to that of the androgen (agonist). Therefore, this study suggests that PHCZs may readily penetrate and disrupt the human androgen receptor (AR), providing the groundwork for future research studies and experimental validation on the molecular docking employed.","PeriodicalId":17914,"journal":{"name":"KIMIKA","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75102110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A New Pentacyclic Triterpenoid from Albizia lebbekoides (DC) Benth (Leguminosae) 豆科Albizia lebbekoides (DC) Benth中一个新的五环三萜

KIMIKA Pub Date : 2021-10-07 DOI: 10.26534/kimika.v32i2.41-46

Yohannes Woldemariam, I. Villaseñor

引用次数: 0

Feasibility of Modifying Existing Chemistry Demonstrations by Using Substitute Materials 用替代材料修饰现有化学演示的可行性

KIMIKA Pub Date : 2020-09-11 DOI: 10.26534/kimika.v31i2.55-61

Dane Mykel M. Quiambao, A. Guidote, Rhodora F. Nicdao

{"title":"Feasibility of Modifying Existing Chemistry Demonstrations by Using Substitute Materials","authors":"Dane Mykel M. Quiambao, A. Guidote, Rhodora F. Nicdao","doi":"10.26534/kimika.v31i2.55-61","DOIUrl":"https://doi.org/10.26534/kimika.v31i2.55-61","url":null,"abstract":"This study aimed to reiterate the use of Chemistry demonstrations as effective teaching tools to students while addressing some of its drawbacks, which discourages teachers from doing them such as cost and safety. Four chosen existing Chemistry demonstrations (Blue Bottle Experiment, Copper Sulfate Experiment, Blown Away, Dancing Flames) were modified by using substitute reagents, which are more accessible, relatively safer, and at lower cost. These demonstrations were chosen based on how easily the substitute reagents will be obtained. Afterwards, with the permission of a private junior high school, they were presented to a group of Grade 9 students of their choosing. The students were asked to evaluate each demonstration using a Likert scale-based questionnaire. This questionnaire rates each demonstration in terms of aesthetics, the materials and procedure done, effectiveness to explain certain Chemistry topics, safety, and the students’ overall judgment regarding the use of demonstrations as teaching tools. By converting their evaluation to quantitative values, the demonstrations scored high in all major categories. With this, it is highly recommended to explore other Chemistry demonstrations for possible modifications, which can be integrated in lecture classes.","PeriodicalId":17914,"journal":{"name":"KIMIKA","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-09-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74949670","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Teaching college chemistry in the time of COVID-19 pandemic: A personal account of teaching in the old normal vs. the new normal 新冠肺炎大流行时期的大学化学教学——新常态与旧常态下的教学体会

KIMIKA Pub Date : 2020-06-25 DOI: 10.26534/kimika.v31i1.70-75

Jr. M. Guidote Armando

引用次数: 4

The Bond-Valence Substituent Index for Predicting the Boiling Temperatures of Aliphatic Hydrocarbons 预测脂肪烃沸腾温度的键价取代基指数

KIMIKA Pub Date : 2020-06-18 DOI: 10.26534/kimika.v31i1.38-55

F. Sumera, Stephani Jacutin, Jan Michael Aficial, Aileen Filipino

{"title":"The Bond-Valence Substituent Index for Predicting the Boiling Temperatures of Aliphatic Hydrocarbons","authors":"F. Sumera, Stephani Jacutin, Jan Michael Aficial, Aileen Filipino","doi":"10.26534/kimika.v31i1.38-55","DOIUrl":"https://doi.org/10.26534/kimika.v31i1.38-55","url":null,"abstract":"A simple molecular descriptor based on molecular structure for predicting the boiling temperature (BT) of alkanes was developed in this paper. This topological index was used to correlate the boiling temperature of aliphatic hydrocarbons with their bond-valence substituent structure instead of by atom-to-atom branching framework. The predictive power of the bond-valence substituent index (BVSI) was evaluated by comparing it with the popular predictor in literature, the Randic index and the more recently proposed index, the Fi of Manso et al. (2012). The model developed through a second order regression of the plot of the alkane’s boiling temperature versus the BVSI index proved successful in its predictive power such that the method was also applied to a combination of aliphatic hydrocarbons, the alkanes, alkenes, alkynes and cycloalkanes. This topological index provided higher correlation with small deviations compared to the topological index used for comparison. A further study of the BVSI index can be explored for other organic compounds with different functional groups and other physical properties besides their boiling temperatures in the future.","PeriodicalId":17914,"journal":{"name":"KIMIKA","volume":"70 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-06-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79730680","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Isolation, Purification and Structure Elucidation of a Xanthone from the Pericarp of Kamandiis (Garcinia rubra Merr.) 金雀花(Garcinia rubra Merr.)果皮中一种山酮的分离纯化及结构分析

KIMIKA Pub Date : 2019-06-28 DOI: 10.26534/kimika.v30i1.40-44

C. M. Ravidas, T. Villar, L. O. Namuco, H. Hernandez

引用次数: 0

Indicators of Asian Achievement in Chemistry: Implications to the Philippine Setting 亚洲人化学成绩的指标:对菲律宾环境的影响

KIMIKA Pub Date : 2019-06-11 DOI: 10.26534/kimika.v30i1.18-30

Joje Mar Perino Sanchez

{"title":"Indicators of Asian Achievement in Chemistry: Implications to the Philippine Setting","authors":"Joje Mar Perino Sanchez","doi":"10.26534/kimika.v30i1.18-30","DOIUrl":"https://doi.org/10.26534/kimika.v30i1.18-30","url":null,"abstract":"This paper aimed to determine the indicators, which could contribute to the Chemistry achievement of selected Asian countries according to the data set provided by the 2015 Trends in Mathematics and Science Survey results. Educational data mining was employed to capture patterns, comparison and correlation among selected Asian countries (Hong Kong, Japan, Malaysia, Singapore, South Korea, Taiwan and Thailand) using TIMSS results in Chemistry and other Science domains achievements, learning resources, school climate, instructional considerations, and student affective aspects. This study found out that the average Chemistry achievement of the Asian countries was significantly higher than the world achievement. Through exploratory analysis, it was revealed that high achievers among the Asian countries have moderate to high perspective towards school climate, instructional considerations and student affective aspects, while those average or low achievers had high perspective towards the said factors. The study concluded that, out of the 15 factors included in the study, nine had positive correlation yet only prior achievement in Science, home educational resources, Science laboratory resources, computer use and prevalence of bullying could significantly determine the achievement of learners in Chemistry. Implications on spiral progression, resource allocation, safe, orderly and harmonious environments, and inspiring stories in instruction were derived for application in the Philippine context to maximize and enhance learning in Chemistry.","PeriodicalId":17914,"journal":{"name":"KIMIKA","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2019-06-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90046982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2