rxns

Question 1

F, Cl + supfuric

Answer 1

acid-base
NaF(s) + H2SO4(l) NaHSO4(s) + HF(g)
Observations: White steamy fumes of HF are evolved.
NaCl(s) + H2SO4(l)  NaHSO4(s) + HCl(g)
Observations: White steamy fumes of HCl are evolved.

Question 2

Br + supfuric 2 step

Answer 2

Acid- base step: NaBr(s) + H2SO4(l)  NaHSO4(s) + HBr(g)
Redox step: 2HBr + H2SO4  Br2(g) + SO2(g) + 2H2O(l)
White steamy fumes of HBr are evolved.
Red fumes of Bromine evolved and a colourless, acidic gas SO2

Question 3

I sulphuric

Answer 3

NaI(s) + H2SO4(oxidises)  NaHSO4(s) + HI(g)
2HI  SO2(g) 
6HI S (s) 
8HI H2S(g)

White fumes of HI evolved.
Black solid  Iodine
A colourless, acidic gas SO2
A yellow solid of Sulphur
H2S (Hydrogen Sulphide), a gas with a bad egg
smel

Question 4

silver Cl, Br, I in ammonia

Answer 4

dissolve to form complex ion
AgCl(s) + 2NH3(aq) [Ag(NH3)2]+
(aq) + Cl
bromide =, Iodide nothing

Question 5

halide + phosphoric acid

Answer 5

NaCl(s) + H3PO4(l)  NaH2PO4(s) + HCl(g)
Observations: White steamy fumes of the hydrogen
halides are evolved.

Steamy fumes of HCl produced when the HCl
meets the air as it dissolves in moisture in
air

Question 6

H halide + ammonia

Answer 6

HCl(g) + NH3(g)  NH4Cl (s)

see: white smoke ie ammonium halide

Question 7

sulphiric, k br, prd w alcohol

Answer 7

fm hbr, combine w alcohol 2 fm bromo alk

R oh +hbr -> R br + wr

Question 8

red phos, iodine

Answer 8

1st: 2P + 3i2 -> 2pi3

n react alcohol 2 fm iodoalk: R Oh +pi3 -> R I + H3po3

Question 9

disproportionation;

Answer 9

species both oxidized, reduced

eg Cl2 +(cold) H2O -> ClO - + Cl- +2H+

Question 10

vol gas xp Ca carbonate, ethanoic

Answer 10

CaCO3
+ 2CH3COOH → Ca(CH3COO)2
+ CO2
+ H2O

Question 11

Cl halk + AgNo3 2 step

Answer 11

w wr: CH2Cl + h2o-> CH3Oh +H+ + cl-

Ag+ + Cl-> AgCl

Question 12

chlorinate 2-methlypropan-2-ol

Answer 12

(CH3
)3COH + HCl → (CH3
)3CCl + H2O.