Lian Sai Chia

TL;DR: Evaluation of the antioxidative activity, conducted in vitro, by using electron spin resonance (ESR) and ultraviolet visible (UV-vis) spectrophotometric assays, showed that these isolated flavonoids possess strong antioxidative capabilities.

TL;DR: This paper developed and applied a two-tier multiple choice diagnostic instrument to assess high school students' understanding of inorganic chemistry qualitative analysis and found that students had difficulty understanding the reactions involved in the identification of cations and anions, for example, double decomposition reactions, the formation and reaction of complex salts and thermal decomposition.

TL;DR: Three new dinuclear tin complexes, [Me2Sn(2-OC6H4CH-NCH[Pri]COO)]SnMe2Cl2 (1), [Me 2Sn( 2-OC10H6CH]-NCH2COO)SnMe 2Cl2(2) and [Ph2sn(2OC10h6CH)-NCH 2COO]SnPh2Cl 2 (3), were prepared and characterized by spectroscopic studies and elemental analyses as a 1 : 1 adduct between diorganotin dich

TL;DR: The authors developed the Qualitative Analysis Teaching Package to help students learn qualitative analysis by facilitating their understanding of the sub-microscopic and symbolic level explanations of the macroscopic level experiences of the procedures and reactions involved, as well as the manipulative, observational and inferential skills and thinking processes required.

TL;DR: This paper found that students found qualitative analysis tedious, difficult to understand and found the practical sessions unrelated to what they learned in class, and they also believed that learning qualitative analysis required a great amount of memory work.