6.2 Groups in the periodic table-group 7 Flashcards
What is the colour and physical state of Chlorine?
It is a yellow-green gas
What is the colour and physical state of Bromine?
It is a red-brown liquid
What is the colour and physical state of Iodine?
It is a purple solid
Why is there a trend in state as you go down the group?
.The melting and boiling points increase as you go down the group
What can you predict from the melting and boiling points increasing as you go down the group?
.Any halogens above chlorine will be gases
.Any below iodine will be solid
Describe the chemical test for Chloirne?
When damp litmus paper is put into a gas the litmus paper is bleached and turned white
When reacting with metals what do Halogens from?
Ionic compounds
What is the charge of a Halide ion?
-1
What is the trend shown by the reaction as you move down group 7?
The reaction gets less vigorous
What does a Halogen+Hydrogen form?
Hydrogen Halide
True or False? Hydrogen Halides dissolve in water
True
When dissolved in water what do Hydrogen Halides produce?
Acidic solutions
Will the Hydrogen Halide fully or Partially dissociate in water?
It will fully dissociate
When dissociated what will hydrogen halides form?
H+ and Halide- ions
Where can a more reactive halogen displace a less reactive halogen?
In an aqueous solution of its salt
What two halogens will chlorine displace?
Bromine and Iodine
What will Bromine displace?
It will displace Iodine but not chlorine
What will Iodine displace?
Neither Chlorine or Bromine
Name three trends seen as you go down the group
.Outer shell becomes further from Nucleus
.Electron Shielding increases
.Attraction decreases between nucleus and outer electrons
.Electrons are gained less easily
.Halogens become less reactive
What does OILRIG stand for?
Oxidation is loss of electrons Reduction is gain of electrons
What does the more reactive Halogen which has displaced the less reactive one form?
A negative ion, therefore being reduced
What will happen to the less reactive halogen that has been displaced?
It is oxidised as it gains electrons and goes from a negative ion to an atom of 0 charge
What is the electron configuration of Fluorine?
2,7
What is the electron configuration of Chlorine?
2,8,7
What does an extra shell of electrons lead to?
Greater shielding and weaker attraction, reduced reactivity
