Publisher: African Journals Online   (Total: 263 journals)

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Showing 1 - 200 of 263 Journals sorted alphabetically
Abia State University Medical Students' Association J.     Full-text available via subscription   (Followers: 2)
Acta Structilia : J. for the Physical and Development Sciences     Open Access   (Followers: 3)
Acta Theologica     Open Access   (Followers: 12, SJR: 0.282, CiteScore: 0)
Africa Development     Open Access   (Followers: 34, SJR: 0.155, CiteScore: 0)
Africa Sanguine     Full-text available via subscription   (Followers: 1)
African Anthropologist     Open Access   (Followers: 16)
African Crop Science J.     Open Access   (Followers: 4)
African Health Sciences     Open Access   (Followers: 4, SJR: 0.446, CiteScore: 1)
African J. of Anaesthesia and Intensive Care     Full-text available via subscription   (Followers: 9)
African J. of Biomedical Research     Open Access   (Followers: 1, SJR: 0.145, CiteScore: 0)
African J. of Chemical Education     Open Access   (Followers: 5)
African J. of Clinical and Experimental Microbiology     Open Access   (Followers: 4, SJR: 0.192, CiteScore: 0)
African J. of Cross-Cultural Psychology and Sport Facilitation     Full-text available via subscription   (Followers: 6)
African J. of Drug and Alcohol Studies     Full-text available via subscription   (Followers: 6, SJR: 0.168, CiteScore: 0)
African J. of Economic Policy     Full-text available via subscription   (Followers: 2)
African J. of Educational Studies in Mathematics and Sciences     Full-text available via subscription   (Followers: 9)
African J. of Food, Agriculture, Nutrition and Development     Open Access   (Followers: 26, SJR: 0.115, CiteScore: 0)
African J. of Governance and Development     Full-text available via subscription   (Followers: 6)
African J. of Health Professions Education     Open Access   (Followers: 6)
African J. of Infectious Diseases     Full-text available via subscription   (SJR: 0.243, CiteScore: 0)
African J. of Livestock Extension     Full-text available via subscription   (Followers: 2)
African J. of Neurological Sciences     Open Access  
African J. of Physiotherapy and Rehabilitation Sciences     Open Access   (Followers: 10)
African J. of Reproductive Health     Open Access   (Followers: 8, SJR: 0.381, CiteScore: 1)
African J. of Rheumatology     Full-text available via subscription   (Followers: 1)
African J. of Social Work     Open Access   (Followers: 1)
African J. of Sustainable Development     Full-text available via subscription   (Followers: 9)
African J. of Traditional, Complementary and Alternative Medicines     Open Access   (Followers: 6)
African J. on Conflict Resolution     Open Access   (Followers: 27)
African Research Review     Open Access   (Followers: 9)
African Review of Economics and Finance     Open Access   (Followers: 9)
African Sociological Review : Revue Africaine de Sociologie     Open Access   (Followers: 3)
Afrika Statistika     Open Access   (Followers: 1)
Afrimedic J.     Open Access   (Followers: 2)
Afrique Science : Revue Intl.e des Sciences et Technologie     Open Access   (Followers: 2)
AFRREV IJAH : An Intl. J. of Arts and Humanities     Open Access   (Followers: 6)
AFRREV LALIGENS : An Intl. J. of Language, Literature and Gender Studies     Open Access   (Followers: 6)
AFRREV STECH : An Intl. J. of Science and Technology     Open Access   (Followers: 3)
Agro-Science     Full-text available via subscription   (Followers: 2)
Agronomie Africaine     Full-text available via subscription  
Agrosearch     Open Access   (Followers: 2)
Animal Research Intl.     Full-text available via subscription   (Followers: 8)
Annales des Sciences Agronomiques     Full-text available via subscription  
Annals of African Surgery     Open Access  
Annals of Biomedical Sciences     Full-text available via subscription   (Followers: 4)
Annals of Humanities and Development Studies     Open Access   (Followers: 7)
Annals of Ibadan Postgraduate Medicine     Open Access  
Annals of Modern Education     Full-text available via subscription   (Followers: 6)
Arab J. of Nephrology and Transplantation     Open Access   (Followers: 1)
Archives of Medical and Biomedical Research     Open Access   (Followers: 3)
ATBU J. of Environmental Technology     Open Access   (Followers: 5)
Bayero J. of Pure and Applied Sciences     Open Access   (Followers: 3)
Bio-Research     Full-text available via subscription   (Followers: 5)
Biokemistri     Open Access  
Botswana J. of Economics     Open Access   (Followers: 1)
Botswana J. of Technology     Full-text available via subscription   (Followers: 1)
Bulletin of Animal Health and Production in Africa     Full-text available via subscription   (Followers: 3)
Bulletin of the Chemical Society of Ethiopia     Open Access   (Followers: 1, SJR: 0.24, CiteScore: 1)
Cameroon J. of Experimental Biology     Open Access  
Central African J. of Medicine     Full-text available via subscription  
Communicate : J. of Library and Information Science     Full-text available via subscription   (Followers: 67)
Contemporary J. of African Studies     Full-text available via subscription   (Followers: 4)
Counsellor (The)     Full-text available via subscription   (Followers: 3)
Creative Artist : A J. of Theatre and Media Studies     Open Access   (Followers: 11)
Critical Studies in Teaching and Learning (CriSTaL)     Open Access   (Followers: 17)
Dar Es Salaam Medical Students' J.     Open Access  
East African J. of Public Health     Full-text available via subscription   (Followers: 4)
East African Medical J.     Full-text available via subscription   (Followers: 2, SJR: 0.122, CiteScore: 0)
East African Orthopaedic J.     Full-text available via subscription   (Followers: 1)
East and Central African J. of Pharmaceutical Sciences     Open Access   (Followers: 3)
East and Central African J. of Surgery     Open Access  
Eastern Africa Social Science Research Review     Full-text available via subscription   (Followers: 7)
Ebonyi Medical J.     Full-text available via subscription  
Egyptian J. of Biochemistry and Molecular Biology     Full-text available via subscription  
Egyptian J. of Biology     Open Access  
Egyptian J. of Natural History     Open Access   (Followers: 1)
Egyptian J. of Pediatric Allergy and Immunology     Open Access   (Followers: 2)
ESARBICA J. : J. of the Eastern and Southern Africa Regional Branch of the Intl. Council on Archives     Full-text available via subscription   (Followers: 6)
Ethiopian J. of Agricultural Sciences     Open Access  
Ethiopian J. of Biological Sciences     Open Access   (Followers: 4)
Ethiopian J. of Business and Economics     Full-text available via subscription   (Followers: 1)
Ethiopian J. of Economics     Full-text available via subscription   (Followers: 4)
Ethiopian J. of Education and Sciences     Open Access   (Followers: 6)
Ethiopian J. of Environmental Studies and Management     Open Access   (Followers: 3)
Ethiopian J. of Health Development     Open Access   (Followers: 7, SJR: 0.131, CiteScore: 0)
Ethiopian J. of Health Sciences     Open Access   (Followers: 8, SJR: 0.418, CiteScore: 1)
Ethiopian J. of Science and Technology     Open Access  
Ethiopian J. of the Social Sciences and Humanities     Full-text available via subscription   (Followers: 8, SJR: 0.101, CiteScore: 0)
Ethiopian Pharmaceutical J.     Full-text available via subscription   (Followers: 2)
Ethiopian Veterinary J.     Open Access   (Followers: 4)
Filosofia Theoretica : J. of African Philosophy, Culture and Religions     Open Access   (Followers: 1, SJR: 0.123, CiteScore: 0)
FUTY J. of the Environment     Full-text available via subscription   (Followers: 1)
Ghana J. of Agricultural Science     Full-text available via subscription   (Followers: 2)
Ghana J. of Development Studies     Full-text available via subscription   (Followers: 8)
Ghana J. of Forestry     Full-text available via subscription   (Followers: 3)
Ghana J. of Geography     Open Access   (Followers: 10)
Ghana J. of Linguistics     Open Access   (Followers: 1)
Ghana Library J.     Full-text available via subscription   (Followers: 15)
Ghana Medical J.     Open Access   (Followers: 1, SJR: 0.301, CiteScore: 1)
Ghana Mining J.     Full-text available via subscription   (Followers: 3)
Global Approaches to Extension Practice : A J. of Agricultural Extension     Full-text available via subscription   (Followers: 1)
Global J. of Agricultural Sciences     Full-text available via subscription  
Global J. of Educational Research     Full-text available via subscription   (Followers: 2)
Global J. of Engineering Research     Full-text available via subscription   (SJR: 0.109, CiteScore: 0)
Global J. of Environmental Sciences     Full-text available via subscription  
Global J. of Geological Sciences     Full-text available via subscription   (Followers: 1)
Global J. of Mathematical Sciences     Full-text available via subscription  
Global J. of Pure and Applied Sciences     Full-text available via subscription  
Global J. of Social Sciences     Full-text available via subscription   (Followers: 3)
Haramaya Law Review     Open Access   (Followers: 1)
Highland Medical Research J.     Full-text available via subscription  
Huria : J. of the Open University of Tanzania     Full-text available via subscription   (Followers: 2)
Ibadan J. of Humanistic Studies     Full-text available via subscription  
IMTU Medical J.     Full-text available via subscription  
Information Manager (The)     Open Access   (Followers: 30)
Information Technologist (The)     Full-text available via subscription   (Followers: 19)
Inkanyiso : J. of Humanities and Social Sciences     Open Access   (Followers: 1)
Internet J. of Medical Update     Open Access   (Followers: 1)
Intl. J. of Applied Agriculture and Apiculture Research     Open Access   (Followers: 3)
Intl. J. of Basic, Applied and Innovative Research     Open Access  
Intl. J. of Community Research     Open Access   (Followers: 2)
Intl. J. of Engineering, Science and Technology     Open Access  
Intl. J. of Health Research     Open Access   (Followers: 4, SJR: 0.101, CiteScore: 0)
Intl. J. of Herbs and Pharmacological Research     Open Access   (Followers: 1)
Intl. J. of Medicine and Biomedical Research     Open Access   (Followers: 1, SJR: 0.104, CiteScore: 0)
Intl. J. of Modern Anthropology     Open Access   (Followers: 2)
Intl. J. of Pedagogy, Policy and ICT in Education     Full-text available via subscription   (Followers: 3)
Italian Studies in Southern Africa : Studi d’Italianistica nell’Africa Australe     Full-text available via subscription   (Followers: 2)
J. de la Recherche Scientifique de l'Universite de Lome     Full-text available via subscription   (Followers: 2)
J. for the Study of Religion     Full-text available via subscription   (Followers: 23)
J. of Agricultural Extension     Open Access   (Followers: 2, SJR: 0.188, CiteScore: 0)
J. of Agricultural Research and Development     Full-text available via subscription  
J. of Agriculture and Food Sciences     Full-text available via subscription   (Followers: 2)
J. of Agriculture and Social Research (JASR)     Open Access   (Followers: 5)
J. of Agriculture, Forestry and the Social Sciences     Full-text available via subscription   (Followers: 5)
J. of Applied Biosciences     Open Access   (Followers: 1)
J. of Applied Science and Technology     Full-text available via subscription   (Followers: 1)
J. of Applied Sciences and Environmental Management     Open Access   (Followers: 2)
J. of Aquatic Sciences     Full-text available via subscription   (Followers: 3)
J. of Community Medicine and Primary Health Care     Open Access   (Followers: 5)
J. of Computer Science and Its Application     Full-text available via subscription   (Followers: 2)
J. of Development and Communication Studies     Open Access   (Followers: 5)
J. of Endocrinology, Metabolism and Diabetes of South Africa     Open Access   (Followers: 8, SJR: 0.174, CiteScore: 0)
J. of Environmental Extension     Full-text available via subscription  
J. of Family Ecology and Consumer Sciences :Tydskrif vir Gesinsekologie en Verbruikerswetenskappe     Open Access  
J. of Health and Visual Sciences     Full-text available via subscription   (Followers: 1)
J. of History and Diplomatic Studies     Full-text available via subscription   (Followers: 8)
J. of Language, Technology & Entrepreneurship in Africa     Open Access   (Followers: 2)
J. of Medical and Biomedical Sciences     Open Access   (Followers: 2, SJR: 0.162, CiteScore: 0)
J. of Medicine and Biomedical Research     Open Access   (Followers: 1)
J. of Meteorology and Climate Science     Full-text available via subscription   (Followers: 13)
J. of Pharmaceutical and Allied Sciences     Full-text available via subscription   (Followers: 1)
J. of Pharmacy & Bioresources     Full-text available via subscription   (Followers: 4, SJR: 0.405, CiteScore: 1)
J. of Religion and Human Relations     Open Access   (Followers: 3)
J. of Research in Forestry, Wildlife and Environment     Open Access   (Followers: 6)
J. of Research in National Development     Full-text available via subscription  
J. of Science and Sustainable Development     Full-text available via subscription  
J. of Science and Technology (Ghana)     Open Access   (Followers: 3)
J. of Social Development in Africa     Full-text available via subscription   (Followers: 8)
J. of the Ghana Science Association     Full-text available via subscription   (Followers: 3)
J. of the South African Society of Archivists     Full-text available via subscription   (Followers: 8)
J. of Tropical Microbiology and Biotechnology     Full-text available via subscription  
Jos J. of Medicine     Open Access  
KCA J. of Business Management     Open Access  
Kenya Veterinarian     Full-text available via subscription   (Followers: 2)
Kioo cha Lugha     Full-text available via subscription  
Lagos Historical Review     Full-text available via subscription  
Lagos Notes and Records     Full-text available via subscription  
Law, Democracy & Development     Open Access   (Followers: 6)
Legon J. of the Humanities     Full-text available via subscription  
Lwati : A J. of Contemporary Research     Full-text available via subscription   (Followers: 2)
Madagascar Conservation & Development     Open Access   (Followers: 3)
Makerere J. of Higher Education     Full-text available via subscription   (Followers: 2)
Malawi J. of Science and Technology     Open Access   (Followers: 6)
Marang : J. of Language and Literature     Full-text available via subscription  
Medical J. of Zambia     Open Access  
Mizan Law Review     Open Access   (Followers: 1)
Momona Ethiopian J. of Science     Open Access   (Followers: 4)
New Agenda : South African J. of Social and Economic Policy     Full-text available via subscription  
New Egyptian J. of Microbiology     Full-text available via subscription  
Nigeria Agricultural J.     Full-text available via subscription   (Followers: 2)
Nigerian Dental J.     Full-text available via subscription   (Followers: 2)
Nigerian Endocrine Practice     Full-text available via subscription  
Nigerian Food J.     Full-text available via subscription   (Followers: 2)
Nigerian Health J.     Open Access   (Followers: 1)
Nigerian Hospital Practice     Full-text available via subscription  
Nigerian J. of Animal Science     Full-text available via subscription   (Followers: 1)
Nigerian J. of Biotechnology     Open Access  
Nigerian J. of Chemical Research     Full-text available via subscription   (Followers: 2)
Nigerian J. of Clinical Medicine     Full-text available via subscription  
Nigerian J. of Family Practice     Full-text available via subscription   (Followers: 1)
Nigerian J. of Gastroenterology and Hepatology     Full-text available via subscription  
Nigerian J. of Guidance and Counselling     Full-text available via subscription   (Followers: 3)
Nigerian J. of Medicine     Full-text available via subscription  
Nigerian J. of Natural Products and Medicine     Full-text available via subscription  
Nigerian J. of Nutritional Sciences     Full-text available via subscription  
Nigerian J. of Paediatrics     Open Access   (Followers: 1)
Nigerian J. of Parasitology     Full-text available via subscription   (Followers: 1)
Nigerian J. of Physiological Sciences     Open Access   (SJR: 0.128, CiteScore: 0)
Nigerian J. of Psychiatry     Full-text available via subscription   (Followers: 3)

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African Journal of Chemical Education
Number of Followers: 5  

  This is an Open Access Journal Open Access journal
ISSN (Print) 2227-5835
Published by African Journals Online Homepage  [263 journals]
  • The “first molecule”: He-H+ as a theme to study chemical bonding by
           molecular modeling

    • Authors: Robson Fernandes de Farias
      Abstract: In April 2019, it was reported [3] the detection (for the first time, in the interstellar space; previous detections were in the lab) of a species that is considered the very first molecule formed in the universe: He-H+(formed about only 100,000 years after the big bang). It was the beginning of chemical synthesis, and, of course, chemistry. In the present work it is reported as such chemical species can be employed as a very good theme to study chemical bonding by using molecular modeling.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
  • Determination of essential and toxic heavy metals in barley (Hordeum
           vulgare) cultivated in selected places in Amhara Region, Ethiopia

    • Authors: Abebaw Shitahun, Merid Tessema
      Abstract: Barley (Hordeum vulgare. L) is used as food, for feeding animals and for malting in the world and in Ethiopia. The levels of essential metals (K, Mg, Ca, Na, Zn, Fe, Ni, Mn, Cu, Cr and Co) and toxic heavy metals (Pd and Cd) in barley samples collected from East Gojjam, Awi zone and West Gojjam, Ethiopia, were determined by flame atomic absorption spectrometry. For the determination, first 0.5 g barely sample was digested using mixtures of 2 mL of HNO3, 1 mL of HClO4 and 1 mL of H2O2 at 210oC for 2:30 hr based on the optimized wet digestion procedure. The optimized wet digestion procedure was evaluated using standard addition (spiking) method and an acceptable percentage recovery was obtained. The mean metal concentration ( mg/kg dry weight basis) ranges in barley are : K (4094–12238), Mg (827–983), Ca (320–886), Na (49.2–62.3), Zn (33.7–76.7), Fe (15.7 – 106), Ni (3.78–27.6), Mn (8.83–13.7), Cu (5.83–10.5), Cr (4.33–6.11), Co (3.38–5.83), Pb (1.44–2.33) and Cd (0.98–1.55). The results were compared with values reported in the literature.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
  • Integrating socio-economic activities of the local community into
           chemistry lessons: a case of fermentation and incomplete combustion at
           Malambanyama Day Secondary School in Chibombo District in Central Province
           of Zambia

    • Authors: Kennedy Kalebaila, Brighton Hamusonde
      Abstract: The purpose of this study was to investigate the impact of integrating socio-economic activities of the local community into chemistry lessons, on attitude and performance of learners. Mixed method research design was used to collect both quantitative and qualitative data. Quantitative data was gathered by CATs and the attitude questionnaire while focus group interviews were used to collect qualitative data. The only grade 12 class at Malambanyama Day Secondary school comprising 43 learners was purposively selected since learners were information-rich. The learners were randomly selected into groups 1 and 2, and the two groups were assigned to the control and treatment groups. The data collected were analyzed by the independent samples t-test, and the Qualitative Data Analysis software. Results obtained indicated that participants’ attitude at pre-intervention was neutral and positive at post-intervention. Pre-test CAT indicated that the two groups were equal in conceptual understanding: (group 1 M = 39.71, SD = 14.94, group 2 M = 39.12, SD = 11.35), t (32) = .129, P = .449, α = .05 at confidence level 95%. At posttest 1 CAT, results were statistically significant (group 1 M = 65.79, SD = 14.94 while group 2 M = 54.58, SD = 11.35), P = .029, t (29) = 1.972, α = .05 at confidence level 95%. At posttest 2 CAT, results were not statistically significant: (group 1 M = 50.91, SD = 16.52, group 2 M = 54.05, SD = 18.14), p = .278, t (41) = -.594, α = .05 at confidence level 95%. Qualitative data analysis results also indicated that learners’ attitude towards chemistry improved when socio-economic activities of learners were incorporated in chemistry lessons. It was, therefore, concluded that integration of socio-economic activities of the local community into chemistry lessons improve both the attitude and academic performance of learner.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
  • Chemical studies of Commiphora terebinthina and Pycnostachys abyssinica
           occurring in Ethiopia

    • Authors: Tegene Tesfaye Tole, Lomi Abayneh
      Abstract: In the course of this study the resins of Commiphora terebinthina and the roots of Pycnostachys abyssinica were collected from Konso and Wolaita Sodo, Ethiopia, respectively. The essential oil of the resin of Commiphora terebinthina was isolated by hydro distillation and analyzed by GC and GC/MS. Identification of the constituents of the essential oil was performed by matching GC/MS of each constituent with Wiley, NIST and user generated mass spectral libraries. The main components identified from the oil of C. terebinthina were: geraniol (24%), aromadendrene (2l %), α-copaene (15%), α-humulene (3.2%) and α-cadinol (7.4%). The resins were also subjected to extraction by petroleum ether, ethyl acetate and methanol, sequentially resulting in the isolation of α-humulene, α-cadinol and T-cadinol using chromatographic techniques. The phytochemical screening of the petroleum ether, chloroform and methanol extracts from the root of Pycnostachys abyssinica revealed the presence of alkaloids, flavonoids, glycosides, phenols, terpenoids, tannins, steroids and acidic compounds using the standard procedure. Chromatographic separation of the chloroform extract resulted in the isolation of β-sitosterol. Characterization of the isolated compounds was performed using the spectroscopic techniques Uv-Vis, IR, 1H-NMR, 13C-NMR and DEPT-135 and comparison with previously reported literature.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
  • Chemistry teachers’ interpretation of some students’ alternative
           conceptions – a pilot study

    • Authors: Ruby Hanson
      Abstract: Chemistry education researchers have shown growing interest in the strategies that teachers employ to diagnose students’ prior knowledge and attempt remediation, where necessary, as most concepts in chemistry look abstract. The ways in which Ghanaian teachers identify and address their students’ alternative conceptions, especially in the study of chemical equilibrium, was explored on a pilot basis through the use of face-to-face, telephone and email procedures. The outcome was compared with what other researchers in other countries had identified through various means. Trainees whose responses were not clear in their e-mail responses were interviewed through telephone and personal interactions. Eleven Ghanaian chemistry instructors from various parts of the country, who were on an eight-week summer sandwich education programme, participated in the study. Data gathered revealed that majority of the participating teachers were aware of their students’ prior conceptions and often had no difficulty diagnosing them but were unaware of all the possible sources of misconceptions nor how to address the root causes of persistent misconceptions. Their non-interactive treatment strategies for the identified misconceptions in their schools were varied, unauthentic and not deep-seated. As many as four common remediation processes were identified for use. On the basis of these findings, it is recommended that the study of students’ misconceptions and some of the appropriate and authentic resolution strategies be incorporated into teacher training curricular.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
  • Assessment of levels of exposure to biogenic amines - a Gambia case study

    • Authors: Matarr Gaye, Osaro Iyekowa, Adjivon Anthony, Mandalena Mendy, Chukwudozie Cyril Ntomchukwu, Oladele Oyelakin
      Abstract: Biogenic amines (BAs) have been reported in a variety of foods namely, fish, milk, yogurt, beef and chicken. Their amounts are usually increased during controlled or spontaneous microbial fermentation of food or in the course of food spoilage. Biogenic amines are basic nitrogenous compounds with important metabolic and physiological significance in living organisms. They also pose some hazards to human health when consumed in quantities beyond their legal limits. Protein containing foods are the main precursors from which BAs are synthesized. A lot of amino acid containing foods are being consumed in The Gambia with no equipped laboratory to assess the levels of BAs. This work involved the study of the factors which enhance the formation of BAs through use of questionnaires, observation and testing (temperature). This research aimed at assessing the level of exposure to biogenic amine contamination by consumers in The Gambia. It was found that the level of biogenic amines may not be beyond their toxic levels in fish, milk and yogurt, but there is a probability of it being high in meat due to lack of proper means of preservation and quiet higher in imported chickens because of the duration of time it takes to get it to final consumers.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
  • Extraction of dye from bark of Syzygium guineense for titanium dioxide
           based dye sensitized solar cell as photo sensitizer

    • Authors: Girma Worku, Demisachew Shitaw
      Abstract: This work was aimed to extract, prepare and use dyes from bark of Syzygium guineense as photosensitizer for dye sensitized solar cell. The extraction processes were takes place in presence of acetone, ethanol and water as solvent. The photoelectron-chemical performance of the DSSCs based on the acetone extract showed Voc of 0.36 V, FF of 0.546, Jsc of 1.57 mA cm-2 and a power conversion efficiency of 0.319% under the sunlight illumination of 100 mW cm-2 and active area of 1 cm2. The J-V curves were plotted according to collected data of DSSCs by using Extech Multimeter, and electrical circuit with resisters made from wood board. The acetone extract of day from bark of Syzygium guineense offered the highest conversion efficiency than ethanol and water extracts. Generally, the dye extracted from bark of Syzygium guineense as natural photosensitizer could be a possible alternative for the production of low cost and environment friendly DSSCs.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
  • Synthesis composite of TiO2/chitosan and TiO2/ bentonite for removing
           turbidity from Ismailia Canal as water treatment plant

    • Authors: A Marey
      Abstract: The conditions of water in Ismailia canal (Mostorod refinery site) are alarming now because it looks more cloudy and dirty. Water was contaminated not only organic trashes, but also inorganic. The adsorption capacity of clays is often used to remove undesirable substances from aqueous solutions. Chitosan is widely used in biological applications due to its biocompatibility and biodegradability. The aim of the present study is to review the possible applications of the nanotechnology for the removal of pollutants from wastewater by TiO2/Bentonite and TiO2/Chitosan, when added this composite to wastewater and when exposed to visible light they will generate OH radical compounds that can degrade organic pollutants and compounds superoxide, at pH 2.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
  • Creativity in workshop: overlap and underlap card technique for
           concentration units of second semester general chemistry

    • Authors: Cassandra Orozco, James E. Becvar, Mahesh Narayan
      Abstract: Creativity in the classroom is the goal for peer leaders of the Peer Led Team Learning Program (PLTL) in the Chemistry Department at the University of Texas at El Paso. The goal is to enhance the learning experience for students taking general chemistry in their workshops or classrooms. These ideas allow students to engage in classroom discussions with their peer leader. The ideas can be themed on concepts such as molecular geometries, kinetics, or acids and bases. In second semester general chemistry, a call to utilizing creativity in the classroom has demonstrated a way for peer leaders to efficiently teach students how to convert the following four main concentration units via kinesthetic interaction: molarity, molality, mole fraction, and percent by mass. What this means is that, by arranging cards as fractions in which the concentration units are represented as ratios, they will be maneuvered by grabbing each card and placing them either over or under another card to get the desired unit. Thus, to reach a desired unit in the numerator and/or the denominator the concept of overlap and underlap is the key to employing these stacks of cards to see how the units relate to one another. This allows students to think about what is needed in the numerator and the denominator. Students gain the opportunity to physically manipulate conversion factors and improve or review their understanding of dimensional analysis.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
  • Chemistry teaching, 'scientific illiteracy' and 'functional
           illiteracy' in Brazil

    • Authors: Robson Fernandes de Farias
      Abstract: In the present work, an analysis of the quality of the students who arrive at the Brazilian federal public universities in the last ten years is made, based on basic chemistry classes for the chemistry, chemical engineering and pharmacy courses. In the last ten years, "scientific illiteracy" as well as "functional illiteracy" have only increased, making it possible to establish (as a general trend) a dire prognosis for the quality of graduates of chemistry courses in Brazil.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
  • Titrimetric analysis of commercial bleach: a Gambia case study

    • Authors: Fatou Marong, Osaro Iyekowa, Oladele Oyelakin, Adjivon Anthony, Mandalena Mendy, Chukwudozie Cyril Ntomchukwu
      Abstract: Ten brands of bleach were analyzed for their sodium hypochlorite (NaOCl) levels using titrimetric method. The levels of NaOCl found in the bleach samples were generally higher than the levels indicated on the respective labels. Only one out of the ten samples had a NaOCl level of below 5% indicating that it is a safe and noncorrosive household bleach.
      PubDate: 2020-02-13
      Issue No: Vol. 10, No. 1 (2020)
       
 
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