Which of the following processes is nost suitable for extracting sodium chloride from sea water? A. electrolysis B. crystallisation C. simple distillation O. fractional distillation

28. \( \mathrm{HgO} \rightarrow \mathrm{Hg}+\mathrm{O}_{2} \)

Which of the following is the function of the atomiser in the emission system of Atomic Absorption Spectroscopy? To split the beam into two To break the steady light into pulsating light To break large mass of liquid into small drops To reduce the sample into atomic state

3.Un trozo de hierro de 50 gramos se calienta a \( 100^{\circ} \mathrm{C} \) y luego se pone en agua fria, donde su emperatura baja a \( 30^{\circ} \mathrm{C} \) ¿Cuantas calorias cede el hierro al egua? (Ce s \( \mathrm{e}^{\left.-0.11 \mathrm{cal} / \mathrm{g}^{\circ} \mathrm{C}\right)} \)

Quanti grammi di soluto bisogna aggiungere a \( 50,0 \mathrm{~g} \) di una soluzione al \( 10,0 \% \mathrm{~m} / \mathrm{m} \) perché la sua concentrazione raddoppi?

Question 1 Releasing agents are used in atomic emission spectroscopy to prevent O Cationic interference O Anionic interference Ooth anionic and cationic O Physical interference