Transition Elements 0.0 / 5 ? ChemistryTransition metalsA2/A-levelOCR Created by: missemmaceCreated on: 21-05-17 12:44 What is a transition element? An element that forms at least one ion with a partially filled d-subshell. 1 of 13 What 2 d-block elements are not transition metals? Zinc & Scandium 2 of 13 What is a catalyst? A substance that increases the rate of a reaction without being changed or used up. Lowers the activation energy of a reaction. 3 of 13 How does a catalyst work? Provides an alternative reaction pathway. 4 of 13 What is a homogeneous catalyst? Catalyst is in the same state as the reactants. 5 of 13 What is a heterogeneous catalyst? Catalyst is in a different state to the reactants. 6 of 13 What is the catalyst for hydrogenation and what type of catalyst is it? Nickel. Heterogeneous. 7 of 13 What is the catalyst in the reaction between iodide and peroxodisulphate ions and what type of catalyst is it? Iron (II) and Iron (III) ions. Homogeneous. 8 of 13 What is a dative covalent bond? Where the bonding pair of electrons comes from one species. 9 of 13 What is a ligand? An electron pair donor that forms dative covalent bonds to transition metal ions. 10 of 13 What is a complex ion? A transition metal ion that has ligands datively covalently bonded to it. 11 of 13 What does the term bidentate mean? There are 2 lone pairs of electrons on the ligand. 12 of 13 What is a coordination number? The number of dative colvalent bonds to the transition metal ion. 13 of 13
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