Using Active Learning in Conductometric Titration

Transcription

1 CHE-OR-01 Using Active Learning in Conductometric Titration Pimchana Hoktha Department of Chemistry, Faculty of Science, Thaksin University, Pattalung 93110, Thailand Active learning for a chemistry experiment was assigned for third-year undergraduate students major chemistry, Faculty of Science, Thaksin University. The objective was desired to improve the students learning through the mini chemistry project. The quantitative analysis by using conductometric titration was selected knowledge. The teaching lessons were the chemical method, organization of laboratory apparatus and substances, ability of presentation and writing a report. The result reflected the students' learning. The assessment of active learning was recorded. The 90 percent of the students was satisfaction and motivation on this practice. Keywords Active learning, Conductivity titration CHE-1

2 CHE-OR-02 Learning Solid with Augmented Reality on Android Nadh Ditcharoen 1 *, Purim Jarujamrus 2, Korawat Polyiam 1, Panida Vangkahad 1 1 Department of Mathematics, Statistics and Computer. 2 Department of Chemistry. Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani 34190, Thailand * scnadhdi@ubu.ac.th Augmented Reality (AR) typically uses built-in technologies, the camera and GPS to display information, videos, illustrations, images, or animations based on the user s surroundings. It has rapidly been applied to supplement with learning process in the last decade. Many research studies have aimed at developing AR applications in order to improve students understanding of learning concepts as well as engaging students interest. In this paper, we present the application of AR in learning chemistry in the topic of solid as a part of the chemistry for science student I course which is very difficult to understand and imagine. We developed the multimedia for learning solid in the form of 3D animations represented the crystalline systems, closest-packed patterns of atoms in unit cell, cubic systems and typically crystalline structures. The animations and markers were created by using Unity 3D, Maya, and ARToolKit. All animations with their makers were provided on the developed website and AR book which were able to be run on an Android device or via web camera. These were available not only for students in learning by themselves anywhere anytime, but also for teachers in supplement with their classes. In this study, pre-test, post-test, and questionnaires were collected for data analysis. The paired-sample T-test analysis indicated that the students obtained post-test score statistically higher than the pre-test score at p<0.01, suggesting that our solid with AR app could help students gain a better understanding of solid. Moreover, it gave students an understanding of what these objects look like in real life without requiring teachers to spend their classroom budget on physical models of these shapes, resulting in increasing students interest in learning chemistry through AR. Keywords Solid; Augmented reality; Android; Life-wide learning; Alternative learning media CHE-2

3 CHE-P-001 Using a Tablet PC to Encourage the Student s learning in Acid-Base Titration Warunee Manosong*, Pimchana Hoktha Department of Chemistry, Faculty of Science, Thaksin University, Songkhla 90000, Thailand * bourboon@hotmail.com This research describes the integration of a tablet PC into an acid-base titration in an effort to improve the chemistry knowledge. The study aims to use a tablet PC to encourage the student s conceptual before an acid base laboratory. This laboratory is stoichiometry concept and titration technique in chemistry. In this study, the principle and experiment simulators were performed for second year undergraduate students (B.ED. (Science Chemistry)). The experiments were obtained including studying indicator ph range, selecting indicator for acid base titration and acid base titration by using experiment simulator in a tablet PC. The students behaviors and pretest and post-test were evaluated. The results shown that the significance difference of pre-test and post-test scores. And the attitudes of student were attentive and convinced in acid base titration. Keywords Tablet PC, Acid-base titration experiment CHE-3

4 CHE-P-002 A New Low-Cost Demonstration Kit for Gold Nanoparticles Synthesis from Gold-Leaf Suraswadee Klab-in 1, Ekasith Somsook 2, Teeraphun Bhumibhamon 3, Ninna Jansoon 1* 1 Department of Chemistry, Faculty of Science, Thaksin University, Muang, Songkhla, Thailand 2 Department of Chemistry, Faculty of Science, Mahidol University, Ratchathewi, Bangkok, Thailand 3 Veterinary Research and Development Center (Southern Part), Thungsong, Nakhon Si Thammarat, Thailand * ninnajansoon@gmail.com Nowaday, green chemistry principles in nanotechnology are developing in nanoscience research. Thus, there is a growing demand for developing environmental friendly and sustainable methods for the synthesis of nanoparticles (NPs) using nontoxic chemicals, environmental benign solvents and renewable materials to avoid their adverse effects. A new, low price and environmental friendly experiment route using gold-leaf has been prepared via an electrochemical method. Goldleaf was used as anode and copper rod as cathode. In this experiment, the aggregation of NPs can be observed by color changing of solution. The UV-visible spectrum showed an absorption band at 520 nm. The Tyndall effect can be observed by the scattering of laser pointer beam. The average of particle size was 20 nm as observed by TEM image. This demonstration kit was built as a protocol for conducting experiments in a general chemistry undergraduate student class or in a senior class in high school as an example of green chemistry from nanotechnology. Keywords Demonstration Kit; Gold Nanoparticles; Gold-Leaf; green chemistry; environmental friendly experiment CHE-4

5 CHE-P-003 Three Levels of Chemical Representation in Stoichiometry: Chemical Equation Ninna Jansoon*, Nawasit Rakbamrung Department of Chemistry, Faculty of Science, Thaksin University, Songkhla 90000, Thailand Department of Chemistry, Faculty of Science, Burapha University, Chonburi 20131, Thailand * Chemical equation is one of the topics in stoichiometry which is abstract and presented in chemical formula and symbols. In order to help secondary students understand more clearly, the designed learning activity which is relevant to the three levels of chemical representation in macroscopic, sub-microscopic and symbolic level is introduced. The learning activity used in this research study consisted of bead models and reaction kit. Then student related the three levels of representation in laboratory report. First, the sub-microscopic level of a reaction between potassium iodide and lead (II) nitrate with bead models were encouraged then symbolic level of chemical equation was represented as: KI + Pb(NO 3 ) 2 KNO 3 + PbI 2. Finally, macroscopic level was then experimentally performed using the reaction kit and obtained the yellow precipitates of PbI 2. The height of PbI 2 precipitates varies with the volume of KI. The moles of limiting reactant and mole ratios could be calculated by plotting a graph between the precipitate heights and the volume of potassium iodide. Within this activity, the students were able to explain the chemical phenomenon at the macroscopic, sub-microscopic and symbolic level. The relationship between the substance mole, limiting reactant mole and balancing chemical equation were also investigated. Keywords Three levels of chemical representation; Stoichiometry; Chemical equation; Learning activity CHE-5