7. Distinguish between a thistle funnel and a dropping funnel

Значение ЭДС гальванического элемента, состоящего из ртутного и кадмиевого электродов при стандартных условиях равно_B ( \( \left(^{0} \mathrm{Mg}^{2+} / \mathrm{Mg}=-2,38 \mathrm{~B}, \mathrm{E}^{0} \mathrm{Cu}^{2+} / \mathrm{Cu}=0,34 \mathrm{~B}\right) \).

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

Balance the following chemical equation (if necessary): \( \mathrm{MnO}_{2}(\mathrm{~s})+\mathrm{HCl}(\mathrm{aq}) \rightarrow \mathrm{MnCl}_{2}(\mathrm{aq})+\mathrm{H}_{2} \mathrm{O}(\mathrm{l})+\mathrm{Cl}_{2}(\mathrm{~g}) \)

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

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