d block Flashcards
What are transition metals?
stable elements with an incomplete d sub level
What are some properties of transition metals?
high melting and boiling point, sonorous and malleable
What are the most common oxidation states of chromium?
2+ 3+ and 6+
What are the most common oxidation states of manganese?
2+ 4+ and 7+
What are the most common oxidation states of iron?
2+ and 3+
What are the most common oxidation states of cobalt?
2+ and 3+
What are the most common oxidation states of copper?
+1 and 2+
What colour is Cr3+ in solution?
green
what colour is CrO42- in solution?
yellow
what colour is Cr2O7,2- in solution?
orange
What colour is MnO4- in solution?
Purple
What colour is Co2+ in solution?
Pink
What colour is Fe2+ in solution?
pale green
What colour is Fe3+ in solution?
Brown yellow
How is a complex ion formed?
A central metal surrounded by molecules linked by coordinate bonds
What are ligands?
Molecules that donate a pair of electrons to a metal ion
What colour is [Cu(Cl4)]2- in solution?
olive green
What colour is [Cu(NH3)4(H2O)2]2+ in solution?
royal blue
What colour is [Cu(H2O)6]2+ in solution?
light blue
What colour is [Co(Cl4)]2- in solution?
royal blue
What colour is [Co(H2O)6]2+ in solution?
pink
What is a heterogenous catalyst?
The reactants and catalyst are in different phases. they form temporary coordinate bonds to fix the reactants and weaken the reactants bonds
What is a homogeneous catalyst?
The catalyst and reactants are in the same phase
What catalyst is used for the hydrogenation of alkanes?
Nickel
What catalyst is used for the Haber process?
Iron
What catalyst is used for the contact process?
V2O5
What catalyst is used for the decomposition of H2O2?
MnO2
What is the only transition metal ion that dissolves in excess OH-?
Chromium
What colour is chromium after OH- drops?
grey ppt
What colour is iron II after OH- drops?
dirty green ppt
What colour is iron III after OH- drops?
red brown ppt
What colour is copper II after OH- drops?
royal blue ppt
