The total number of cyclic isomers possible for a hydrocarbon with the molecular formula C₄H₆ is

The synthesis of 3-octyne is achieved by adding a bromoalkane into a mixture of sodium amide and and alkyne

The bond energy (in kcal mol^-1) of a C-C single bond is approximately

The concentration of potassium ions inside a biological cell is at least twenty times higher than the outside. The resulting potential difference across the cell is important in several processes such as transmission of nerve impulses and maintaining the ion balance. A simple model for such a concentration cell involving a metal M is :
M(s) | M⁺ (aq ; 0.05 molar) || M⁺ (aq ; 1 molar) | M(s)
For the above electrolytic cell the magnitude of the cell potential | E_cell | = 70 mV.

For the above cell :