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CHAP 7/4

QuestionAnswer
H- HALOGEN COVALENT BOND IS BROKEN BY... WATER. BOND REQUIRES LOADS OF ENERGY ENDOTHERMIC.,
HOW IS THE ENRGY REGAINED FROM BREAK H-X BOND?... ENERGY REGAINED BY FORMATION OF DATIVE BOND WITH OXYGEN IN WATER AND H+ TO FORM HCO3+ ION.
WHY IS THE HYDROGEN HALIDE BOND THE STRONGEST ACID ... BECAUSE THE H-I IS THE WEAKEST, SO REMOVAL OF HYDROGEN ION MORE ENERGETICALLY FAVOURABLE. HI(G)+H20(L) à H3O+(AQ) +I-(AQ). HF(G)+H20(L) REVERSIBLE ARROWS H30+(AQ) +F-(AQ).
WHAY COLOUR ARE HYDROGEN HALIDES AT ROOM TEMP... COLOURLESS.
WHEN GASEOUS H-CL REACTS WITH GASEOUS AMMONIA WHAT IS FORMED ... WHITE FUMES OF SOLID AMMONIUM CHLORIDE
HCL(AQ) +NH3(G) --> NH4CL(S). AMMONIA IS A BASE.
HOW DOES AMMONIA PLAY PART IN TESTS .. USED TO TEST FOR HI, HCL, AND HBR BUT DOESN'T DISTINGUISH BETWEEN THEM
WHICH HYDROGEN HALIDES IS THE STRONGEST ... H-I IS STRONGEST REDUCING AGENT. IN REACTION THE H-X ARE OXIDISED TO HALOGENS. 2HX à X2 +2H+2E-.
GASEOUS H-I REDUCES CONCENTRATED SULPHURIC ACID TO ... SULPHUR AND H2S.
GASEOUS H-I REDUCES CONCENTRATED SULPHURIC ACID WHAT’S GIVEN OFF ... CLOUDS OF VIOLET IODIDE VAPOUR GIVEN OFF. SULPHUR IN SULPHURIC ACID REDUCED FROM OXIDATIVE STATE OF +6 IN SULPHURIC ACID TO -2 IN H-SULFIDE AND O IN ELEMENTAL SULFUR.
SULPHUR IN SULPHURIC ACID REDUCED FROM ... OXIDATIVE STATE OF +6 IN SULPHURIC ACID TO -2 IN H-SULFIDE AND O IN ELEMENTAL SULFUR.
WHY DOES H-BR ONLY PARTIALLY REDUCE CONCENTRATED SUFURIC ACID TO SUFUR DIOCZXIDE S02.? WEAKER REDUCING AGENT IT IS ITSELF OXIDISED TO BROWN BROMINE VAPOUR. 2HBR + H2SO4 REVERSIBLE SIGN BR2 + 2H2O+S02 THE SULPHUR IN SUFURIC ACID IS REDUCED FROM OXIDATION STATE OF +6 IN SULPHURIC ACID TO +4 IN SULPHUR DIOXIDE.
WHY CAN’T H-F AND H-CL REDUCE CONCENTRATED SUFURIC ACID... NOT STRONG ENOUGH REDUCING AGENTS.
GROUP 1 METALS FORM IONIC SALTS OF MX E.G. ... KI ,NACL.
GROUP 2 METALS FORM IONIC SALTS OF .. MX2 E.G. CABR2.
D BLOCK METALS FORM SALT OF FORMULA .. MX2/MX3.
WHEN SALTS HYDRATED THEY ARE ... IONIC E.G. CU(II)CL, CUCL2 AND FECL3.
ARE HALIDE SOLUABLE IN WTAER... ALL HALIDES SOLUBLE IN WATER.
WHICH HALIDES ARE NOT SOLUABLE IN WATER ... SILVER HALIDES LEAD CL-(AQ) + AG+(AQ) à AGCL(S) (WHITE). BR-(AQ) +AG+(AQ) à AGBR(S)(CREAM).
SILVER HALIDES SILVER-CL COULR IS ... WHITE SOLID PRECIPITATE .
SILVER –BR COLOUR IS .... CREAM PRECIPITATE.
Created by: ufuoma
 

 



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