Edexcel A Level Chemistry:复习笔记7.1.1 Chirality
Optical isomers A carbon atom that has four different atoms or groups of atoms attached to it is called a chiral carbon or chiral centre Chira comes from a Greek word meaning hand, so we talk about...
Edexcel A Level Chemistry:复习笔记6.3.4 Ligand Exchange
Ligand Exchange Ligand exchange (or ligand substitution) is when one ligand in a complex is replaced by another Ligand exchange forms a new complex that is more stable than the original one ...
Edexcel A Level Chemistry:复习笔记6.3.3 Reactions of Ions in Aqueous Solution
Reactions with Hydroxide & Ammonia When transition metal ions in aqueous solution react with aqueous sodium hydroxide and aqueous ammonia they form precipitates However some of these pre...
Edexcel A Level Chemistry:复习笔记6.3.2 Chromium
Reduction & Oxidation of Chromium Species For chromium we need to consider the following standard electrode potential values We will use zinc and hydrogen peroxide as oxidising agents Th...
Edexcel A Level Chemistry:复习笔记6.3.1 Vanadium
Colours & Oxidation States Vanadium is a transition metal which has variable oxidation states The table below shows the important ones you need to be aware of Addition of zinc to the van...
Edexcel A Level Chemistry:复习笔记6.2.12 Autocatalysis
Manganese(II) ions as an Autocatalyst Autocatalysis the term used to describe a reaction which is speeded up by a product which acts as a catalyst for the reaction If you plot a rate graph o...
Edexcel A Level Chemistry:复习笔记6.2.11 Homogeneous Catalysis
Homogeneous Catalysts Homogeneous catalyst is in the same physical state (phase) as the reactants This means they are either all gases, or more often, all in aqueous solution Homogenous cata...
Edexcel A Level Chemistry:复习笔记6.2.10 Heterogeneous Catalysis
Heterogeneous Catalysts A heterogeneous catalyst is in a different physical state (phase) from the reactants Heterogeneous catalysts are usually solids whereas the reactants are gaseous or i...
Edexcel A Level Chemistry:复习笔记6.2.9 Catalysis
Properties of Catalysts Transition metals are often used as catalysts in the elemental form or as compounds The ability of transition metals to form more than one stable oxidation state mean...
