Question | Answer |
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 |