Consulta la tabla periódica que se encuentra en el apéndice 1 de tu libro de tex o identifica si los siguientes conjuntos de elomentos forman parte de un poriod un grupo o ninguno. Unelos con una llnea. \( \begin{array}{l}\text { a) } \mathrm{Li}, \mathrm{Na}, \mathrm{K}, \mathrm{Rb} \\ \text { beriodo } \\ \text { br } \mathrm{Sr}, \mathrm{Ag}, \mathrm{Cd} \\ \text { c) } \mathrm{Fe}, \mathrm{Co}, \mathrm{Ni}, \mathrm{Cu} \\ \text { d) } \mathrm{He}, \mathrm{Ne}, \mathrm{Ar}, \mathrm{Xe} \\ \text { e) } \mathrm{S}, \mathrm{Se}, \mathrm{Te}, \mathrm{Po}\end{array} \quad \) Ninguno

The pH value is an expression of the molarity of \( \mathrm{H}_{3} \mathrm{O}^{+} \)ions in solution. This concentration has strong impact on chemical reactions. The molarity is very small value, and therefore awkward to use. The pH scale simplifies this concentration making communication easier and faster. Demonstrate the relationship between pH and \( \mathrm{H}_{3} \mathrm{O}^{+} \)molarity, using the formula, \( \mathrm{pH}=-\log \left(\mathrm{H}_{3} \mathrm{O}^{+}\right) \) where () indicates concentration in molarity of a substance. What is the pH of a solution, having the \( \mathrm{H}_{3} \mathrm{O}^{+} \)concentration of 0.000491 M ? Add your answer

3. จงอ่านชื่อของสารประกอบต่อไปนั้ 3.1 Bas \( 3.2 \mathrm{Mg}\left(\mathrm{HCO}_{3}\right)_{2} \) 3.3 ZnO \( 3.4\left(\mathrm{NH}_{4}\right) \mathrm{HPO}_{4} \) \( 3.5 \mathrm{~K}_{2}\left(\mathrm{CO}_{4}\right. \)

A substance with a pH of 2 is

3. จงอ่านชื่อของสารประกอบต่อไปนี้ 3.1 Bas

Extremes of pH can damage human tissues. Reflux is simply the effect of stomach acid damaging the esophagus. Several strong acids and bases can be found around the home. Lye is strong base used for a variety of purposes around a house. Lye can also damage tissues. What effect does lye have on pH ? A. Decrease pH B It does not change pH (C) Increase pH