Aqa A-Level Chemistry Period 3 Questions With Complete Solutions.

AQA A-LEVEL CHEMISTRY PERIOD 3
QUESTIONS WITH COMPLETE SOLUTIONS.
reaction,of,sodium,with,water-,observation,,,ANS,-
Floats,,fizzes,and,moves,on,the,surface,of,the,water,,molten.,melts,into,a,ball,and,disappears



pH,of,sodium,with,water,,,ANS,-alkali,,12-14



sodium,oxide,formula,,,ANS,-Na2O



What,is,the,structure,bonding,in,NaO,,,ANS,-ionic,lattice,,ionic,bonding,between,Na+,ions,an,O2-,ions



Why,is,the,melting,point,of,sodium,oxide,high?,,,ANS,-
ionic,lattice,with,strong,electrostatic,forces,of,attraction,between,ions,(Na,and,O),so,a,lot,of,energy,is,requ
ired,to,break,it



formation,of,sodium,oxide,equation,,,ANS,-4Na+O2-->,2Na2O



formation,of,sodium,oxide-,observation,,burning,Na,in,air,,,ANS,-
burns,vigorously,in,air,with,yellow,flame,and,white,solid,formed



Describe,sodium,as,an,alkali,metal.,,,ANS,-
needs,to,be,stored,in,oil,to,prevent,it,from,reacting,with,air.,can,be,cut,with,a,knife,,exposing,a,shiny,surfa
ce,which,tarnishes,quickly,-,forming,layer,of,Na2O.



sodium,oxide,and,water,equation,,,ANS,-Na2O+H2O-->,2NaOH



sodium,oxide,and,HCL,equation,,,ANS,-Na2O+2HCL-->,2NaCl+H2O



sodium,oxide,and,sulfuric,acid,equation,,,ANS,-Na2O+H2SO4-->,Na2SO4+H2O

, sodium,oxide,and,water,reaction,description,,,ANS,-
sodium,oxide,dissolves,in,water,and,the,oxide,ion,acts,as,a,base,and,accepts,H+,from,the,water,or,acid



how,quickly,does,magnesium,react,with,water?,,,ANS,-
magnesium,reacts,very,slowly,with,water,forming,a,solution,of,pH,9-
10.,But,vigorously,with,water,vapour,above,100c,(steam)...,in,absence,of,air.



magnesium,and,water,equation,,,ANS,-Mg+2H2O(l)-->,Mg(OH)2+H2



magnesium,and,water,vapour,equation,,,ANS,-Mg+H2O(g)-->,MgO+H2



What,is,the,structure,bonding,in,magnesium,oxide?,,,ANS,-
ionic,lattice,structure,,ionic,bonds,between,positive,Mg,ions,and,negative,O,ions.



why,is,the,melting,point,of,magnesium,oxide,high?,,,ANS,-
due,to,the,strong,electrostatic,forces,of,attraction,between,oppositely,charged,ions,(Mg,and,O),in,the,ioni
c,lattice,,which,require,a,large,amount,of,energy,to,break



why,is,the,melting,point,of,magnesium,oxide,high,than,sodium,oxide,,,ANS,-
Mg2+,ions,is,smaller,and,has,a,higher,2+,charge,than,the,Na+,ion.,the,electrostatic,forces,of,attraction,bet
ween,the,Mg2+,ions,and,the,O2-,ions,are,higher,than,between,the,Na+,and,O2-,ions



magnesium,burning,in,oxygen,observation,,,ANS,-vigorously,,bright,white,light,and,a,white,solid,forms



magnesium,oxide,and,water,equation,,,ANS,-MgO+H2O-->,MgO(OH)2



magnesium,and,oxygen,equation,(burning),,,ANS,-2Mg+O2-->,2MgO



pH,of,solution,of,magnesium,oxide,,,ANS,-slightly,alkali,,around,pH9-10



magnesium,oxide,and,HCL,equation,,,ANS,-MgO+2HCL-->,MgCl2+H20