Lithium (Li), sodium (Na) and potassium (K) are the first three alkali metals, in order down Group I. aLithium burns in air to produce a solid oxide. Write the word and balanced symbol equations for this reaction (include state symbols in your chemical equation)​

)benzene and toluene form nearly ideal solutions. consider an equimolar solution of benzene and toluene. at 20 °c the vapour pressures of pure benzene and toluene are 9.9 kpa and 2.9 kpa, respectively. the solution is boiled by reducing the external pressure below the vapour pressure. calculate (i) the pressure when boiling begins, (ii) the composition of each component in the vapour, and (iii) the vapour pressure when only a few drops of liquid remain. assume that the rate of vaporization is low enough for the temperature to remain constant at 20 °c.