In the reaction \( \mathrm{Zn}+\mathrm{H}_{2} \mathrm{O} \rightarrow \mathrm{ZnO}_{2}+\mathrm{H}_{2} \) Which element, if any, is oxidized? A. Zinc B. Hydrogen C. Oxygen D. None

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 \( \mathrm{e}^{\left.-0.11 \mathrm{cal} / \mathrm{g}^{\circ} \mathrm{C}\right)} \)

\( - Mg ( OH ) _ { 2 } + \ldots HCl \rightarrow MgCl _ { 2 } + \ldots H _ { 2 } O \)

Draw the partial (valence-level) orbital diagram and write the symbol, group number, and period number of the element with the following configuration: \( \qquad \mathrm{Ne}] 3 s^{2} 3 p^{5} \) Part 1 of 4

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