(1ai)Give the name of 3 group II element.
(1aii)Write the electronic configurations of any two of the element named in a(i) above.
i.Electronic Configuration of Magnesium is 1s^2
2s^2 2p^6 3s^2
ii.Electronic Configuration of Barium is 1s^2 2s^2
2p^6 3s^2 3p^6 4s^2 4p^6 5s^2 5p^6 6s^3
NOTE:- Pls note dat dis sign ^ means raise to
(1aiii)State 3 important requirements for polymerization to take place.
(1bi)Give 3 chemical properties of an acid.
1)Acids reacts with some metals like iron,zinc,magnesium to liberate hydrogen gas.
2HCl(aq) + Zn(s) ->ZnCl2(aq) + H2(g)
2)Acids reacts with insoluble bases to form salt&water as d only product.
H2SO4(aq) + 2KOH(aq) –>K2SO4(aq) + 2H20(l)
3)Acids reacts with trioxocarbonates(IV) to liberate carbon(IV)oxide.
2HCl(aq) + Na2Co3(aq) –>2NaCl(aq) + H2O(l) + Co2(g)
(1bii)Name 3 methods of preparing salts.
Answer:- Salt can be prepared using d following methods:-
1)By titrating an alkali agains an appropriate acid.
2)By the direct displacement of the hydrogen ion in an acid by a metal more reactive dan hydrogen e.g zinc
3)By heating a diluted acid&the base is added a little at a time,until no more base can dissolve.
excess base is den filtered off,leaving d salt formed in d solution.
(1biii)Give d laboratory test for carbon(IV)oxide.
Answer:- Bubble the unkown gas through lime water (calcium hydroxide).if the gas is carbon(IV) oxide,the lime water will turn milky due to the precipitation of insoluble calcium trioxocarbonate
(1ci) Give d name of a suitable indicator for titration b/w hydrochloric acid and sodium trioxocarbonate
Answer:- the name of the suitable indicator for the above titration is Methyl orange becos the color at end point is orange and HCl is a strong acid while Na2CO3 is a strong base.