The solubility of gases in water usually decreases with increase of temperature.

The solubility of gases in water usually increases with increase in pressure.

The substances having similar inter-molecular forces are likely to be soluble in each other.

Gases like $\text{NH}_3$ and $\text{CO}_2$ obey Henry's law

$\text{F}_2 + 2e^- \rightarrow 2\text{F}^-$

$2\text{H}^+ + \dfrac{1}{2}\text{O}_2 + 2e^- \rightarrow \text{H}_2\text{O}$

$\text{Fe}^{2+} \rightarrow \text{Fe}^{3+} + 1e^-$

$\text{Cu}^{2+} + 2e^- \rightarrow \text{Cu}(s)$

Oxidation occurs at the cathode

Reduction occurs at cathode

Usually denoted by a negative sign

Is usually made up of non conducting material.

Distilled water

Sugar solution

Salt solution

Alcohol solution