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Iodine forms a diatomic molecule

Iodine forms a diatomic molecule

Postby alics » Mon Oct 20, 2014 2:44 am

Iodine forms a diatomic molecule, I(2)
a) Explain why solid iodine does not conduct electricity. ?

(b) When heated, solid iodine turns directly into iodine
gas .Use the kinetic particle theory to explain this change of state.?

(c) Draw a ‘dot-and-cross’ diagram to show the bonding in an iodine molecule.
Show only the outer shell electrons.?

(d) Chlorine, bromine, iodine and astatine are all in Group VII.
(i) What is the formula for an astatide ion?

(ii) Complete the table about the appearance at room temperature of the elements in
Group VII.?


(iii) Predict the appearance of astatine at room temperature.?

(e) Chlorine is bubbled into aqueous potassium iodide.?
(i) Describe what you would see.
?
(ii) Construct the ionic equation for the reaction that takes place.?

(f) Explain why astatine will not react with aqueous potassium iodide.?
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Re: Iodine forms a diatomic molecule

Postby umercm » Mon Oct 20, 2014 3:01 am

(a) No free electrons / no delocalised electrons / no sea of electrons / all electrons are in
covalent bonds / electrons cannot move .

(b) Molecules gain (kinetic) energy .
Allow particles move faster
Not atoms gain energy
Overcome intermolecular forces / break attraction between molecules
Ignore weak forces between particles
Not break covalent bonds


(c) Correct structure – ignore inner shells
Allow all crosses or all dots

(d) (i) At–

(ii) element colour state
Cl(2) gas
Br(2) orange liquid
I(2) grey / black
Correct states
Correct colour
Allow red / brown for bromine .

(iii) Black solid / dark grey solid

(e) (i) (colourless to) yellow solution / straw solution / brown solution / dark grey solid .

(ii) Cl(2) + 2I^–  I(2) + 2Cl^–Ignore state symbols


(f) Astatine is less reactive than iodine / astatine is less oxidising that iodine / iodide is a better
reducing agent than astatide
Ignore reference to reactivity series
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Re: Iodine forms a diatomic molecule

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Re: Iodine forms a diatomic molecule

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Re: Iodine forms a diatomic molecule

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