Automation of data processing of the results of the chemical experiment on modeling the production of synthetic rubber using Microsoft Excel

The article presents an approach to the processing of chemical experiment’s data using a Microsoft Excel software. Instead of storing the experiment data in text files, it is proposed to use a Microsoft Excel file of a certain structure. A macro has been developed to automate the process of transferring data from text files to a common file. The described approach can be applied when solving problems accompanied by storing a large amount of statistical data, which can be obtained as a result of natural or computational experiments. The macro has been tested on the data of a laboratory and numerical experiment on the synthesis of a styrene-butadiene copolymer. This copolymer is formed as a result of carrying out the process of copolymerization in continuous mode in a cascade of continuous stirred tank reactors. The results of the experiment are the characteristics of the formed product for each reactor of the cascade at the end of each hour of process modeling. Transferring data into a single file of a certain structure allows you to graphically present the results of the experiment and facilitates further analysis of the characteristics of the product being studied, depending on the formulation and process conditions.

Oxidative Aromatization of 4,7-Dihydro-6-nitroazolo[1,5-a]pyrimidines: Synthetic Possibilities and Limitations, Mechanism of Destruction, and the Theoretical and Experimental Substantiation

The reaction tolerance of the multicomponent process between 3-aminoazoles, 1-morpholino-2-nitroalkenes, and aldehydes was studied. The main patterns of this reaction have been established. Conditions for the oxidation of 4,7-dihydro-6-nitroazolo[1,5-a]pyrimidines were selected. Previous claims that the 4,7-dihydro-6-nitroazolo[1,5-a]pyrimidines could not be aromatised have now been refuted. Compounds with an electron-donor substituent at position seven undergo decomposition during oxidation. The phenomenon was explained based on experimental data, electro-chemical experiment, and quantum-chemical calculation. The mechanism of oxidative degradation has been proposed.

Synergistic effect of adsorption and photocatalysis for the degradation of toluene by TiO2 loaded on ACF modified by Zn(CH3COO)2

Activated carbon fiber (ACF) was modified by Zn(NO3)2, ZnCl2 and Zn(CH3COO)2), respectively, and then TiO2 was loaded on the modified ACFs. The adsorption and photocatalysis performance were explored through the removal of toluene, and TiO2/ACF-Ac modified by Zn(CH3COO)2) with the best toluene performance was selected. The characterization results indicated that TiO2 was mainly loaded on the surface with large amount of oxygen-containing functional groups in anatase phase. The photoelectric chemical experiment results demonstrated that the modified ACFs remarkably improved the charge transmission and the separation efficiency of electrons and holes, and enhanced the utilization rate of sunlight. The adsorption saturation time reached 40 hours and photodegradation rate was 70%. The direct desorption of generated small molecule substances such as H2O and CO2 from the surface of the composites can achieve the in-situ regeneration of the adsorbent. Overall, the bifunctional catalysts provide a prospective way for the treatment of VOCs.

USE OF PEDAGOGICAL TEACHING TECHNOLOGIES IN PRACTICAL WORK ON CHEMISTRY

Охарактеризован традиционный подход к методике проведения практических работ по химии и выделены его компоненты. Обосновано использование блочно-модульной технологии обучения при проведении химического эксперимента, дана ее характеристика. Описано содержание модульной карты, состоящей из учебных элементов, включающих инструкцию к практической работе, источники учебного материала, вопросы и задания, входной и выходной контроль знаний и умений. Приведен пример модульной карты для практической работы в 11-м классе. Показаны методические возможности использования кейсов и кроссенсов как средств контроля знаний, их особенности для химического эксперимента. Приведены примеры кейса и кроссенса. Представлены результаты анкетирования обучающихся с целью выявления их отношения к работе с модульными картами, кейсами и кроссенсами. The traditional approach to the method of carrying out practical work in chemistry is characterized and its main components are identified. The use of block-modular teaching technology in conducting a chemical experiment has been substantiated. A characteristic of block-modular technology is given, the content of a modular map, consisting of educational elements reflecting the content of practical work in chemistry, sources of educational material, questions and tasks, input and output control of knowledge and skills, is described. The functions of educational elements in the module are highlighted, which allow organizing the experimental activity of students. An example of a modular card for practical work in chemistry in grade 11 is given. The methodological possibilities of using cases as one of the unconventional means of input and output control of knowledge and skills, their features for a chemical experiment are described, an example of a case is given. The characteristic is given to crossenсes as elements of the game technology of teaching, which are used to control the quality of mastering the content of practical work. An example of crossenсe to the experiment “Obtaining hydrogen in a test tube” is presented. The results of a survey of schoolchildren in order to identify their attitude to work with modular cards, cases and crossenсes are presented. It was found that the majority of respondents reacted positively to the use of these didactic materials in practical work in chemistry.