C1 2014 Flashcards
Write an equation for the process that has an enthalpy equal to the electron affinity of chlorine
Cl (g) + e- -> Cl- (g)
In terms of electrostatic forces, suggest why the electron affinity of fluorine has a negative value
Attraction between nucleus and protons and electrons
Explain why the theoretical enthalpy of lattice dissociation for silver fluoride is different from the experimental value that can be calculated using a born haber cycle
AgF has covalent character
AgF is not perfectly ionic
Suggest why hydration of the chloride ion is an exothermic process
Water is polar
Cl- attracts water molecules
Sulfur oxide reacts with water to form a solution containing ions
Write an equation for this
SO2 + H2O -> H+ + HSO3-
[Cu(H2O)6]2+
Pale blue ppt to deep blue sol equation
[Cu(H2O)4(OH)2] + 4NH3 -> [Cu(H2O)2(NH3)4]2+
Deduce half equations for the electrode reactions in a hydrogen-oxygen fuel cell
H2 -> 2H+ + 2e-
O2 + 4H+ +4e- -> 2H2O
Using these equations to explain how an electric current can be generated
Hydrogen produces electrons
Oxygen accepts electrons
Suggest the main adv of using hydrogen in a fuel cell rather than in an internal combustion engine
Less energy wasted as more efficient
Explain in terms of electrons why the complexes are different colours
Ligands are different
Different energies of d electrons
Different wavelengths are absorbed
Different wavelength are transmitted
Name the strongest attractive force between two ammonia molecules
H bonds
State why magnesium chloride solution could not be used for this purpose
Insoluble
Write an equation for this reaction of magnesium with titanium chloride
2Mg -> 2MgCl2 + Ti
Use your knowledge of the reactions of group 2 metals with water to explain why water should not be used to put out a fire in which magnesium metal is burning
H2 produced
Risk of explosion as H2 is flammable
State what is observed when conc ammonia solution is added to this yellow ppt
No effect
