5 - physical chem & transition elements Flashcards
name common uses of :
- Iron
- Copper
- Titanium
iron: construction
copper: electrical cables + water pipes
titanium: aerospace + cosmetic dentistry
what two d-block elements have special electronic configs
Chromium and copper
what is the electronic config of chromium
electronic config of coppper
1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^5
1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^10
both elements only fill till 4s1 then move to 3d
define transition elements
d-block elements that form at least one ion with a partially filled d-orbital.
which two d-block elements are not classed as transition metals and why?
Scandium and zinc (first and last d-block in p4)
sc forms Sc3+ ion with no d-subshell
and Zn forms a Zn2+ ion with a full filled s-subshell
3 properties of transition metals and their compounds in general?
form coloured compounds
elements and compounds can acts as catalysts
form compounds in which the transition element has different oxidation states
what is the trend of number of oxidation states across transition elements
Sc -> Mn increases
Mn -> Zn decreases
iron has two common oxidation states, what are the colours of these solutions
Chromium has two common oxidation states, what are the colours of these
Fe2+ -> pale green
Fe 3+ -> yellow
Cr3+ -> green
Cr 6+ -> yellow/orange
eq for Haber process, catalyst, homogenous or heterogenous
N2 (g) + 3H2 (g) -> 2NH3 (g)
Iron catalyst
heterogenous
contact process for production of SO3
catalyst? eq? what type of catalyst?
2SO2(g) + O2 (g) -> 2SO3 (g)
Vanadium Oxide, V2O5
heterogenous
hydrogenation of vegetable fats
catalyst? eq? type of catalyst?
alkene + h2 -> alkane
Nickel catalyst
heterogenous
catalytic decomposition of H2O2
catalyst? eq? type of catalyst?
2H2O2 (aq) -> 2H2O (l) + O2 (g)
heterogenous
Manganese Oxide, MnO2
S2O8^2- (aq) + 2I- (aq) -> 2SO4^2- (aq) + I2 (aq)
this uses a homogenous catalyst, what is it?
Fe2+ (aq)
zinc + acid
catalyst? what type? eq?
Zn (s) + H2SO4 (aq) -> ZnSO4 (aq) + H2 (g)
Cu2+ (aq)
homogenous
