d block Flashcards
(32 cards)
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
