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CHAP 7/4
Question | Answer |
---|---|
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. |