Group 7(17), the halogens Flashcards
describe the observation of F2
pale yellow gas
describe the observation of Cl2
green gas
describe the observation of Br2
orange/brown liquid
describe the observation of I2
grey/black solid , purple vapour
1) describe the observation of Cl2 + potassium chloride
2) describe the observation of Cl2 + potassium bromide
3) describe the observation of Cl2 + potassium iodide
Very pale green solution,
-no reaction
Yellow solution, Cl has displaced Br
Brown solution, Cl has displaced I
describe the observation of Br2 + potassium chloride
describe the observation of Br2 + potassium bromide
describe the observation of Br2 + potassium iodide
Yellow solution, no reaction
Yellow solution, no
reaction
Brown Solution, Br
has displaced I
describe the observation of I2 + potassium chloride
describe the observation of I2 + potassium bromide
describe the observation of I2 + potassium iodide
Brown solution,
no reaction
Brown solution,
no reaction
Brown solution,
no reaction
The reactions of halide ions with silver nitrate
-Fluorides produce no precipitate
-Chlorides produce a white precipitate
Ag+(aq) + Cl- (aq) –> AgCl(s)
Bromides produce a cream precipitate
Ag+(aq) + Br- (aq) –>AgBr(s)
Iodides produce a pale yellow precipitate
Ag+ (aq) + I- (aq) –>AgI(s)
The reaction of halide salts with concentrated sulfuric acid of flouride and chloride
F- and Cl- ions are not strong enough reducing agents to reduce the S in H2SO4
-No redox reactions occur. Only acid-base reactions occur.
observation of flouride with H2SO4
White steamy fumes of HF are evolved
observation of chloride with H2SO4
White steamy fumes of HCl are evolved
describe the boiling point of down group 7
- Increases
because the van der walls forces increase due to the increasing size and relative mass of the atoms
describe the electronegetivity of group 7
-decreases
because the atoms get larger and the distance between the positive nucleus and bonding electron increases. More sheilding
describe the oxidising ability of halogens
-decreases
( strong oxidising ability like chlorine can displace weak oxidising ability like bromine
what reaction occurs between f- and concentrated sulfuric acid?
acid base reaction
what reaction occurs between cl- and concentrated sulfuric acid?
acid base reaction
what is the equation for the reaction between
a) chloride ion and concentrated sulfuric acid
b) fluoride ion and concentrated sulfuric acid
a)NaCl (s) +H2SO4 (l) –>NaHSO4 (s) + HCl (g)
b) NaF (s) + H2SO4(l)–> NaHSO4(s) +HCl (g)
what is the redox equation for the reaction between
a) Bromine and concentrated sulfuric acid
b) Iodine and concentrated sulfuric acid
a) 2H+ +2Br- + H2SO4 (s) –> SO2(g) +2H2O(l) + Br2(l)
b) 8H+ + 8I + H2SO4(l)–> H2S(g)+ 4H2O(l) + 4I2(s)
what is the observation of
a) H2S(g)
b)I2(s)
c) S
a) smell of rotten eggs
b) black solid
c) yellow solid
what does the halide produce when reacted with silver nitrate
-silver halide
equation of fluroide with silver nitrate and observation
F-(aq) + Ag+ (aq) –> AgF(aq)
-no precipitate
