Group 7 QP
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How do weak intermolecular forces arise between chlorine? [3]
[1] Random movement of electrons in one molecule [2] Induces a temporary molecule in the neighbouring molecule [3] Temporary dipoles attract
What is the equation between chlorine and water? [1]
[1] Cl2 + 2H2O <–> HCl + HClO
Equation for the manufacturing of bleach? [1]
[1] Cl2 + 2NaOH –> NaClO + NaCl
Why is excess of silver nitrate used in practicals? [1]
[1] To ensure all halide ions are removed
State an observation when sodium chlorine reacts with concentrated sulfuric acid? What is the equation? What is the role of the chlorine ions? [3]
[1] Misty fumes [2] H2SO4 + NaCl –> NaHSO4 + HCl [3] Base
Give the equation for the redox reaction between solid sodium bromide and concentrated sulfuric acid? Why is it redox? [3]
[1] 2NaBr + 2H2SO4 –> Na2SO4 + Br2 + SO2 + 2H20 [2] Br changes oxidation state from −1 to 0 and is oxidised [3] S changes oxidation state from +6 to +4 and is reduced
What is observed when aqueous chlorine is added to sodium bromide solution? What is the ionic equation? [2]
[1] Orange solution [2] Cl2 + 2Br- –> 2Cl- + Br2
What is the role of sulfuric acid when reacting with group 7? [1]
[1] Proton donor
What is the equation, an observation and role of sulfuric acid when sodium bromide reacts with conc sulfuric acid? [3]
[1] 2NaBr + 2H2SO4 + SO2 + Br2 + 2H20 [2] Orange fumes [3] Oxidisng agent
Out of bromine, strontium chloride and iodine mono chloride, give the order of melting points. [6]
[1 + 2] SrCl2 > ICl > Br2 [3] SrCl2 has ionic bonding / giant ionic lattice [4] SrCl2 strong ionic bonds need a lot of energy to overcome [5] ICl has permanent dipole - dipole forces [6] Bromine has VdW forces
What is the reaction of phosphorus and bromine to form phosphorus tribromide? [1]
[1] 6Br2 + P4 –> 4PBr3
Shape of PBr4+ and the bond angle? [2]
[1] Tetrahedral [2] 109
Out of bromide and chloride ions, which is better oxidised? [2]
[1] Br- ions are bigger then Cl- ions [2] Br- ions are more easily oxidised
Reaction between silver chloride and dilute ammonia? [1]
[1] AgCl + 2NH3 –> Ag(NH3)2+ + Cl-
How to get a pure sample of AgBr after just separating it from AgCl? [2]
[1] Filter off remaining AgBr precipitate [2] Dry to remove water
Ionic equations between chlorine and dilute sodium hydroxide. Oxidation of chlorine? [3]
[1] Cl2 + 2HO- –> OCl- +Cl- + H2O [2] +1 in OCl- [3] -1 in Cl-
When is sulfuric acid a proton donor?
A base pH, titration or neutralisation
When is sulfuric acid an oxidising agent?
Redox reaction Sulfur products