- Created by: Bethany
- Created on: 25-01-12 18:56
What are transition elements?
Elements within the D-block in periodic table where the D subshells are being filled.
Give the electron configeration of Fe...
Which two transition elements have unexpected electron configerations and why does this happen?
Cronium and Copper, as the elements strive to having half filled subshells or full subshells in order to be more stable, therfore electrons move to fulfill this need.
Explain why scandium and zinc are not true transition metals...
Scandium has no 3d or 4s subshell and Zinc has 3d10 and 4s2 and are therefore completely stable.
What are the three chemical properties of transition metals?
Coloured ions, varible oxidation states, action as catalysts.
Describe how transition metals can be coloured ions...
They have partially filled d orbitals and can therefore absorb energy in order to make them more stable.
Give the definition of a cataylst...
A substance that increases the rate of a reaction without being used up in the process.
What are the three important catalysts from transition elements?
1. Born Haber (Fe catalyst) for fertiliser
2. Hydrogenation of Alkenes (Ni) for margerine
3. Contact process (V2O5) for sulfuric acid.
What are the four precipitation reactions, their ionic equations and colour changes?
1. Fe2+(aq) + OH-(aq) ------> Fe(OH)2(s)
Changes from pale green to green.
2. Fe2+(aq) + OH-(aq) ------> Fe(OH)2(s)