Clasify the following into elements, compounds and mixtures. `(AS_(1))`
a. sodium b. soil c. sugar solution d. silver
e. calcium caronate f. tin g. silicon h. coal i. air
J. Methane k. carbon dioxide

A portein has been isolated as sodium salt with their molecular formula Na_(x)P (this notation means that xNa^(+) ions are associated with a negatively charged protein P^(-x)) . A solution of this salt was prepared by dissolving 0.25g of this sodium slat of protein in 10g of water adn ebulliscopic analysis revealed that soluion boils at temperature 5.93 xx 10^(-3).^(@)C higher than the normal boiling point of pure water. K_(b) of water 0 .52 kg mol^(-1) . Also elemental analysis revealed that the salt contain 1% sodium metal by weight. Deduce molecular formula and determine molecular weight of acidic form of protein H_(X)P .

Surafce tension is exhibited by liquids due to force of attraction between the molecules of the liquid .The surface tension decreases with increases in temperature and vanishes at boiling point Given that the latent heat of vaporization for water L_(v)=540(kcal)/(kg) the mechanical equivalent of heat J=4.2(J)/(cal) density of water rho_(w)=10^(3)kgl^(-1) ,Avogadro'sno. N_(A)=6.0xx10^(26)k " mole"^(-1) . Molecular weight of water M_(A)=10kg , for 1k mole . (a) Estimate the energy required for one molecule of water to evaporated. (b) Show that the inter molecular distance for water is d=((M_(A))/(N_(A))xx(1)/(rho_(w)))^((1)/(3)) and find its value. (c ) 1 g of water in the vapour state at 1 atm occupies 1601cm^(3) , estimate the intermolecular distance at boiling point in the vapour state. (d) During vaporisation a molecule overcomes a force F, assumed constant to go from an inter molecular distance d to d .Estimate the value of F. (e ) Caculate (F)/(d) , which is a measure of the surface tension.