Letramento em química, educação planetária e inclusão social

From the different conceptions on scientific and technology literacy (STL), and reflections on globalization and social inclusion, this paper points out the responsibility of the chemists in social actions by their associations for supporting political actions to improving the quality of life, and to protecting the environment by sustainable development for changing the modern society. Supporting ideas for equity within the society between the nations, and giving examples from approaching of socioscientific issues of the textbook "Chemistry and Society", it demonstrated the role of the teachers and the chemistry professionals to realize the STL of the people in the planetary perspective.

Influence of the temperature and type of salt on the phase equilibrium of peg 1500 + potassium phosphate and peg 1500 + sodium citrate aqueous two-phase systems

The present work analyzed the effect of the temperature and type of salt on the phase equilibrium of aqueous two-phase systems (ATPS) formed by poly (ethylene glycol) (PEG) 1500 + potassium phosphate, from (278.15 to 318.15) K, and PEG 1500 + sodium citrate, from (278.15 to 298.15) K. The rise of the temperature normally increased the slope of the tie line (STL). With respect to the influence of the type of salt, sodium citrate showed better capability to induce phase separation, when compared to potassium phosphate.