The aim of this article is to ascertain whether grade-12 students have sufficient background knowledge to explain the properties of acids, bases, and salts from their constituent ions or molecules. In addition, this research seeks to discern if certain learning difficulties are due to this lack ...
Data were obtained using a (1) 12-item achievement test on acids and bases that was administered to both groups as a pretest and a posttest, (2) self-evaluation 13-item questionnaire on students' perceptions of their competence and confidence in carrying out the inquiry activities that was ...
We have identified four categories of rationales why students need to understand acid-base processes: daily life; socio-scientific; curriculum; and HoS argument. We now discuss each in turn, briefly. Acids and bases are commonly recognized by students and the general public. People know about ac...
Weak Inorganic Acids and Bases IEC has found increasing use for the determination of weakly ionized inorganic anions such as fluoride, nitrite, phosphate, sulfite, arsenite, arsenate, bicarbonate, borate and cyanide. This approach is very effective for the determination of weakly ionized anions in sa...
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The qualitative amino acid composition of the peptidoglycan, in particular the diagnostic diamino acid, is of high taxonomic relevance and allows in combination with 16S rRNA gene sequence data the tentative affiliation of a strain to a genus. The identification of the diamino acids l-lysine, l-...
Grade: Technical 4.11 Protective Equipment and Clothing SRP: When working with strong solutions of acids or bases or other caustic or corrosive materials, always wear a full face mask. When working with caustic or corrosive gases or vapors, a full face mask will not protect the eyes or prevent...
Semivolatiles;Benzoic Acid and Benzoic Acid Solutions;Acids &;Bases;Building Blocks;Carbonyl Compounds;Carboxylic Acids;Chemical Synthesis;Essential Chemicals;Inorganic Salts;Phenols;Absolute Configuration Determination (Exciton Chirality CD Method);Analytical Chemistry;Enantiomer Excess & Absolute Configuration ...
All other chemicals were of analytical or higher grade from Sigma Aldrich (St. Louis, MO, USA). Plant material The mutant plants used in this study, eto2 [62] and ein2-1 [63] were previously described. Arabidopsis thaliana (L.) Columbia-0 (Col-0) seeds, and mutant plant seeds were...
For example, the oxyanion VO3−, the conjugate bases of monoprotic acids was formed which occurs at/or near the pKa of acids. Therefore, the mechanism or adsorption of oxyanions of vanadium involves the replacement of surface –OH and/or –OH2 on variable charge surface....