A \( 6.99 \cdot 10^{-2} \mathrm{M} \) solution of KOH is made. What is the pOH of this solution? What is the pH of this solution? What is the \( \left[\mathrm{H}^{+}\right] \)in the solution? Record this answer in scientific notation using 3 sig figs.

What is another name for Group 8A?A. Group 18AB. Group 8C. Group 8BD. Group 18

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

Consider the reaction represented \( \mathrm{byCr}_{2} \mathrm{O}_{7}^{2-}+\mathrm{Cl}^{-} \xrightarrow{\text { i. Explain why the reaction is a redox reaction. }} \quad \mathrm{Cr}^{3+}+\mathrm{Cl}_{2} \) iii. Balance the redox equation State five physical properties of metals

\( 2 LiOH ( s ) \rightarrow Li 2 O ( s ) + H 2 O ( l ) \)

Balance the following chemical equation (if necessary): \[ \mathrm{Ca}(\mathrm{s})+\mathrm{O}_{2}(\mathrm{~g}) \rightarrow \mathrm{CaO} \text { (s) } \]