unit 1 chemistry cover Flashcards
1
Q
What are ligands?
A
Negative ions or molecules with nonbonding pairs of electrons that they donate to the central metal atom or ion, forming dative covalent bonds.
2
Q
When do d orbitals split to higher and lower energies?
A
When the electrons present in approaching ligands cause the electrons in the orbitals lying along the axes to be repelled.
3
Q
How can heterogeneous catalysis be explained in terms of?
A
The formation of activated complexes and the adsorption of reactive molecules onto active sites.
4
Q
What is thought to allow activated complexes to form?
A
The presence of unpaired d electrons or unfilled d orbitals.
5
Q
What can homogeneous catalysis be explained in terms of?
A
Changing oxidation states with the formation of intermediate complexes.
