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CHAP 7
Question | Answer |
---|---|
HALOGEN REACT WITH METALS ... | TO FORM SALTS. ASTATINE IS A RADIOACTIVE ELEMENTS OF HALF LIFE 8.3 HOURS. |
AT ROOM TEMP AND PRESSURE CL- AND F- GASES LIQUID? ... | ARE GASES. |
AT ROOM TEMP WHAT IS BROMINE STANDARD STATE A ... | VOLATILE LIQUID, |
IODINE STANDARD STATE IS... | A SOLID THAT SUBLIMES ON HEATING. |
COLOUR OF IODINE IS .... | DARK GREY FORMS A VIOLET VAPOUR. |
COLOUR OF BROMINE IS ... | A BROWN LIQUID. |
COLOUR OF CHLORINE IS ... | A GREENISH GAS. |
COLOUR OF FLUORINE IS ... | A PALE YELLOW GAS. |
1ST I.E. OF HALOGEN ... | DECREASES DOWN THE GROUP. NUCLEAR CHARGE INCREASES. EFFECTIVE NUCLEAR CHARGE REMAINS SAME |
THE ATOMIC RADIUS OF GR 7 .. | INCREASES AS NEW SHELLS OUTERMOST ELECTIONS LESS STRONGLY HELD. SO FROM FLUORINE TO 1ST I.E. DECREASES. |
ELEMENT GAINS AN ELECTRON... | ENERGY IS RELEASED |
ELECTRON AFFINITY OF GRR7 ... | DECREASES DOWN THE GROUP |
WHY ELECTRON AFFINITY OF GRR7 DECREASE DOWN THE GROUP... | COZ ELECTRONS NOT AS CLOSE TO NUCLEUS IN LARGE ATOMS THAN IN SMALLER. |
WHEN A LARGE ATOM GAINS AN ELECTRON ... | LESS ENERGY IS RELEASED THAN A SMALLER. |
WHY CHLORINE RELEASE LESS ENERGY ANOMALOUS WHEN GAIN ELECTRONS ... | SO SMALL REPULSION BETWEEN THE 7 OTHER ELECTRONS AND THE 1 ELECTRON REDUCES THE ENERGY DUE TO THE ATTRACTION TO THE POSITIVE NUCLEUS OF THE 1 ELECTRON |
IN CL TAKES LESS ENRGY TO REMOVE ELECTRON COZ... | SO SMALL AND OTHER ELCTRONS REPEL ONE ELECTRON. |
CHLORINE AND BR | OMINE ARE SOLUBLE /INSOLUABLE?.. SOLUABLE IN WATER |
WHY ARE CHLORINE AND BROMINE SOLUABLE IN WATER? ... | THEY REACT REVERSIBLE WITH WATER & FORM A MIXTURE OF ACIDS : CL2 + H2OàHCL + HOCL. |
AQUEOUS SOLUTIONS CHLORINE AND BROMINE CALLED ... | BR AND CL WATER. |
COLOUR OF BR WATER & CL WATER IS ... | BROWN RED CHLORINE WATER IS PALE GREEN. |
IODINE SOLUBLE OR INSOLUABLE IN H2O? | SLIGHTLY SOLUBLE IN H20 |
COLOUR OF IODINE FORMS... | PALE BROWN UNLESS KI – WHICH CAUSES DEEP BROWN RED DUE TO I3- ION. I2(AQ) + I-(AQ) àI3-(AQ). |
WHY IS KI DEEP BROWN RED ... | DUE TO I3- ION. I2(AQ) + I-(AQ) àI3-(AQ). |
ALL HALOGENS MORE SOLUBLE IN ... | INERT ORGANIC SOLVENTS SUCH AS TETRACHLORIDE OR HEXANE THAN WATER. |
2 EXAMPLES OF ORGANIC SOLVENTS THAT HALOGENS MORE SOLUBLE IN... | TETRACHLORIDE OR HEXANE |
IF HEXANE ADDED TO AQUEOUS SOLUTION WITH HALOGEN ... SOLUTION OF IODINE IN HEXANE IS VIOLET. | SOLUTION OF IODINE IN HEXANE IS VIOLET. |
BONDING IN COMPOUNDS OF HALOGENS IS .. | IONIC BONDING |
HALOGENS 1- CHARGE COZ... | HIGH ELECTRONEGATIVITY VALUES & WHEN HALOGEN ATOM ACCEPTS AN ELECTRON THE ELECTRON CONFIGURATION COMPLETE. |
GROUP I1 AND 2 METAL HALIDES ARE IONIC OR COVALENT ... | IONIC CACL. |
GROUP 3 ALF3 IS IONIC COZ... | METAL AND NON METAL. |
ANHYDROUS ALUMINIUM CHLORIDE IS COVALENT OR IONIC....? | COVALENT ALCL3.6H2O EACH ALUMINIUM SURROUNDED BY 6 H20 MOLECULES WITH DATIVE COVALENT BONDS FROM OXYGEN TO THE CENTRAL AL3+ ION. ANHYDROUS ALUMINIUM |
CL- SUBLIMES ON HEATING PRODUCING... | GAS AL2CL6. |
IN THIS DIMER THE 2 ALCL3 UNITS JOINED BY DATIVE BONDS ... | EACH FORM A CHLORINE ATOMS. THE OUTER ORBIT CONTAINS AN OCTET OF ELECTRONS. |
ALL ATOM IN COVALENT ALCL3 HAS ... | 6 ELECTRONS IN OUTER ORBIT ITS OWN 3 PLUS OTHER 3. |
A LONE PAIR IN A CL ATOM IN ANOTHER ALCL3 FORMS ... | A DATIVE BOND USING AN EMPTY 3P ORBITAL OF AL. |
COZ OF DATIVE BOND IN ALCL3 AL HAS ... | AL HAS 4 PAIRS OF ELECTRONS IN OUTER ORBIT. AND THE 4 CL ARE ARRANGED TETRAHEDRAL |
HOW IS ALCL3 ARRANGED ... | TETRAHEDARLLY. |
WHEN 2 ALCL3 ATOMS JOIN ARE THERE BONDS BETWEEN THEM ... | NO BONDS BETWEEN THE 2 AL ATOMS (DON’T DRAW A BOND). |
BONDING WITH D BLOCK METALSà CL BR I IN WHAT BLOCK... | D BLOCK METALS |
D BLOCK METALS ARE ... | ARE COVALENT WHEN ANHYDROUS & IONIC WHEN HYDRATED. FECL3 IS COVALENT AND SOLUBLE IN ORGANIC SOLVENTS. |
HYDRATED ION ARE BONDED WITH ... | 6 MOLS OF WATER BONDED DATIVE COVALENT BONDS FROM OXYGEN IN WATER TO EMPTY 3D-4SP ORBITAL'S OF THE IRON 3+ ION. THE SHAPE IS OCTAHEDRAL & THE CORNERS LABELLED OH2. |
COVALENT BONDING:à HALOGENS FORM POLAR ... | POLAR COVALENT BONDS WITH ALMOST ALL NON METALS. |
FLUORINE IS THE MOST... | ELECTRONEGATIVE. IN THE -1 OXIDATION STATE |
WHEN DOES FLOURINE HAVE TO BE POSISTIVE ... | WHEN BONDED TO F- OR O2-. |
CHLORINE HAS 5 EMPTY 3D ORBITAL'S, SO ONE OF ... | OF 3P ELECTRONS CAN BE PROMOTED |
WHY CAN A CHLORINE 3P ELECTRON BE PROMOTED ... | COZ CHLORINE HAS EMPTY 3P ORBITAL. |
HOW MANT COVALENT BONDS CAN CHLORINE FORM... | MORE THAN 1. |
OXIDISING POWER OF HALOGENS IN OR DE... | DECREASE DOWN THE GROUP. |
METALS REACT WITH HALOGEN TO FORM ... | HALIDES -1 OXIDATION STATE . E.G. 2FE +3CL2 à2FECL3 |
WHICH IS THE LESS POWERFUL OXIDISING AGENT IN GR7 ... | IODINE FE + I2 àFEI2 |
IN A LIMITED SUPPLY OF O2 . 2P+ 3CL2 à 2PCL3. ... | PHOSPHORUS TRICL- CAN REACT WITH CL- AND FORM PENTA CL-. IN EXCESS CL- PHOSPHORUS PENTACHLORIDE IS FORMED. 2P + 5CL2 à 2PI5. |
IODINE REACT WITH THE RED ALLOTROPE OF PHOSPHORUS TO FORM ... | PHOSPHORUS TRIIODIDE. 2P + 3I2 à 2PI3. |
IF MIXTURE OF PI3 IS DAMP THEN ... | CAN REACT WITH WATER TO FORM HYDROGEN IODIDE GAS. PI3 + 3H20 à 3HI+H3PO3 (THIS HOW GASEOUS HYDROGEN IODIDE IS PREPARED.) |
HOW IS GASEOUS HYDROGEN IODIDE PREPARED ... | MIXTURE OF PI3 IS DAMP THEN ... |
CAN REACT WITH WATER TO FORM HYDROGEN IODIDE GAS. PI3 + 3H20 à 3HI+H3PO3 | |
A HALOGEN WILL DISPLACE A LESS REACTIVE HALOGEN. | A HALOGEN WILL DISPLACE A LESS REACTIVE HALOGEN. |
WHEN CL- BUBBLED IN KBR ... | CL- OXIDISES THE BROMIDE IONS. BROWN BROMINE IS FORMED. CL2 + 2BR-àBR2 + 2CL- . THE CL- MOLECULE GAIN 2 ELECTRONS FORM EACH BROMIDE ION : 2BR-(AQ) à BR2(AQ) + 2E-. CL2(G) + 2E- à 2CL-(AQ). |
CL DISPLACES ... | IODINE FROM IODIDES |
WHEN CHLORINE DISPLACE IDODINE WHAT DOES IT FORM .. | A DARK GREY PRECIPITATE OF IODINE CL2 + 2I- à I2 + 2CL-. |
BROMINE ALSO DISPLACES ... | IODINE FROM IODIDES BR2(AQ) + 2I-(AQ) à I2(S) +2BR-(AQ). |
THE DISPLACEMENT OF BR BY CL- IS USED IN ... | EXTRACTION OF BROMINE SEAWATER , HAS SMALL AMOUNT OF BR IONS. |
IODINE IS THE LEAST REACTIVE SOO... | WILL ALWAYS BE DISPLACED |
CL GAS IS BUBBLED INTO SEAWATER & BR PRODUCED IS ... | REMOVED BY BLOWING AIR THROUGH THE SOLUTION. |
CL GAS IS BUBBLED INTO SEAWATER & BR PRODUCED IS ... | REMOVED BY BLOWING AIR THROUGH THE SOLUTION. |
(SEAWATER )ON COOLING THE BROMINE VAPOUR ... | CONDENSES IS COLLECTED |
IODINE IS ONLY VIOLET WHEN .. | A GAS OR DISSOLVED IN HEXANE OR TETRACHLORIDE |
HOW DOES CL REACT WITH WATER ... | REVERSIBLE TO FORM HCL ACIDIC AND WEAK ACID CHLORIC (I) ACID. |
WHAT DOES CL FORM WHEN REACTED IWTH WTAER ... | HCL ACIDIC AND WEAK ACID CHLORIC (I) ACID THE SOLUTION ACIDIC COZ THE H+. |
H+ IONS MAKE SOLUTIONS ... | ACIDIC |
REACTION OF CL WITH WATER IS WHAT TYPE OF REACTION...WHY? | THIS IS A DISPROPORTIONATION REACTION. CL2- STARTS IN 0 OXIDATION STATE & IS REDUCED TO -1 IN CL- ION AND OXIDISED TO +1 IN CHLORIC (I) ACID HOCL. CL- IS SIMULTANEOUSLY OXIDISED AND REDUCED. |
HOW DOES FLUORINE REACT WITH WTAER... | IRREVERSIBLY WITH WATER FORM HYDROGEN FLUORIDE AND OXYGEN. |
WHAT IS FORMED WHEN F-(G) + H20(L) ... | HF AND O2. |
HOW DOES BROMINE REACTS WITH WATER (REVERSIBLEY WITH WATER ) BUT POSITION OF EQUILIBRIUM MORE ON LEFT. | BR2(AQ) + H2O(L) REVERSIBLE ARROWS H+(AQ) + BR-(AQ) +HOBR (AQ) |
HOW DOES IODINE REACT WITH WATER ... | |
ALKALI AT ROOM TEMP CL- BR-I-ALL REACT IODINE DOESN’T REACT WITH WATER. WITH COLD AQUEOUS NAOH ... | BY DISPROPORTIONATION REACTIONS FORM MIXTURE OF HALIDE AND HALATE (I) SALTS |
DISPROPORTION REACTION WITH CL AND COLD AQUEOUS NAOH ... | CL2(0) + 2NAOH àNACL(-1) + NAOCL(+1) +H2O. THE CL IN ZERO STATE REDUCED TO -1 IN NACL AND OXIDISED TO +1 IN NAOCL (SODIUM CHLORATE (I)). IONIC EQUATION IS: CL2(AQ) + 2OH- (AQ) à CL-(AQ) +OCL (AQ) +H20(L). |
F- REACTS IRREVERSIBLE WITH WATER TO FORM HYDROGEN FLUORIDE AND OXYGEN. CL IS TOTALLY IONISED INTO H+ AND CL- IONS. WHEN BOLIING ARE HF BOND BROKEN ...WHY ? | NO HF HAS INTERMOLECULAR BONDS, COVALENT BONDS |
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) à 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 REDUCING AGENT ... | 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 |
STRENGTH OF HALIDE AS REDUCING AGENTS | INCREASE FROM ... CL- TO I-. 2X- +2E-àX2. |
WHY ARE CHLORINE IONS VERY DIFFICULT TO OXIDES ... | COZ WEAK REDUCING AGENTS HARDER TO LOSE ELECTRON. OXIDISED BY KMAGANATE OR CLO- IONS IN DILUTE SULPHURIC ACID. |
IS IT EASY TO OXIDISED A BR ION ...? | YES , BROMIDE IONS MORE EASILY OXIXDISED BY, BY CL-, KDICHROMATE (VI) & KMAGANATE IN DILUTE SULPHURIC ACID. |
IODIDE IONS STRONG REDUCING AGENTS SO ARE... | OXIDISED BY MANY. E.G. FE2+ REDUCED TO FE3+ IODINE IONS IN SOLUTION. 2 HALF EQUATIONS ARE: 2I-(AQ) àI2(S) +2E- , FE3+(AQ) + E- à FE2+(AQ). |
BECAUSE KBROMIDE IS COLOURLESS THE EQUATIONS ARE ... | KBR +H2SO4 à HBR +KHSO4. 2HBR +H2SO4 àBR2 + SO2 +2H2O |
WHEN IODIDE PRODICED WHAT COLOUR FUMES... | STEAMY FUMES OF IODIDE BUT MOSTLY VIOLET CLOUD OF IODINE VAPOUR & YELLOW SULPHUR. SMELL OF ROTTEN EGGS COZ HYDROGEN SULFIDE ALSO PRODUCED. |
WHAT MAKES SMELL OF ROTTEN EGGS .. | HYDROGEN SULFIDE. |
TEST FOR HALIDES ... | DILUTE NITRIC ACID IS ADDED TO SOLUTION OF UNKNOWN HALIDE UNTIL JUST ACIDIC. AG NITRATE SOLUTION ADDED. CL-,BR-,I- ALL PRODUCE A PRECIPITATE OF SILVER HALIDE. |
WHAT COLOUR PRECIPITATE DOES HALIDES GIVE IN TEST ... | CHLORIDE (INCLUDING HCL) GIVE A WHITE PRECIPITATE SOLUBLE IN DILUTE AQUEOUS AMMONIA. |
BROMIDES GIVE CREAM PRECIPITATE WHICH IS INSOLUBLE IN DILUTE AQUEOUS AMMONIA BUT SOLUBLE IN CONCENTRATED AQUEOUS AMMONIA. IODIDES GIVE PALE YELLOW PRECIPITATE – INSOLUBLE IN BOTH DILUTE AND CONCENTRATED AQUEOUS AMMONIA | |
WHY IS DILUTE NITRIC ACID ADDED TO SILVER HALIDE PRECIPITATE... | TO PREVENT THE PRECIPITATION OF OTHER IONS (CARBONATE) BY SILVER IONS. |