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CCEA Exemplar Scheme of Work: GCE Chemistry. Unit AS 2: .. www.chemguide.co.uk/basicorg/isomerism/geometric.html How does catalyst work? Look at how this Introduce factors affecting – cation size and lattice enthalpy of oxide.
This page looks at the the different types of catalyst (heterogeneous and homogeneous) with examples of each kind, and explanations of how they work. You will
Ionic 'an electrostatic force of attraction between a lattice of oppositely charged a part – look up 'hybridisation' on chemguide if you want to understand more) using average bond energies to do calculations is pretty much the same level as .. to explain the effect of increased temperature and how a catalyst works in the
In this scheme of work we have made the assumption that it will be taught over about 30 weeks . including the generation of the nitronium ion and acylation using AlCl3 as a catalyst. .. Compare lattice enthalpies from Born–Haber cycles with those from . www.chemguide.co.uk/inorganic/complexions/colour.html.
Chemguide: Support for CIE A level Chemistry to come up, and how much you need to learn as opposed to working it out if you have to. If you think of these as ionic, then SnO and PbO will have giant ionic lattices consisting of . In the case of carbon monoxide, a catalyst is needed even at relatively high temperatures.
The Lewis acid acts as a catalyst or a halogen carrier, as its function is to carry the in symmetrical structure, molecules are closely packed in the crystal lattice.
You will find some of this covered quite briefly on this page with links to other . is released either as lattice enthalpy or the hydration enthalpy of the metal ion. . Transition metals and their compounds function as catalysts either because of
This page describes and explains the way that adding a catalyst affects the Note: If you haven't already read the page about collision theory, you should do so
Chemguide: Support for CIE A level Chemistry What the list might do is to give you ideas for answers to some of CIE's Use catalysts where possible. . In that case, the ions find it very difficult to come together to produce a stable lattice. Whatever order you have been working through the syllabus in, Section 11.3 is
You should talk about "lattice dissociation enthalpy" if you want to talk about the Or you can do physics-style calculations working out how much energy would
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