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CHAP 7 1

QuestionAnswer
HALOGENS AND IODINE TITRATION: 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. S
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 BROMINE 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
Created by: ufuoma