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  • Chemistry Factsheet: 180. Bonding and Anti-Bonding Molecular Orbitals

    Chemistry Factsheet: 180. Bonding and Anti-Bonding Molecular Orbitals

    To succeed in this topic you need to:-• Be familiar with basic ideas about atomic orbitals• Be familiar with the Pauli Exclusion principle (in the form “themaximum number of electrons ...

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  • Chemistry Factsheet: 181. Genetic Fingerprinting

    Chemistry Factsheet: 181. Genetic Fingerprinting

    The Process of Genetic FingerprintingOften, only tiny samples are available. This requires the DNA tobe first copied to increase the amount present. This is done usingthe polymerase chain reaction.Enz...

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  • Chemistry Factsheet: 182. Electronegativity  Predicting Reaction Products

    Chemistry Factsheet: 182. Electronegativity Predicting Reaction Products

    This Factsheet gives guidance on the use of relative electronegativities to help you predict reactions involving reactants with polar covalentbonds. Before starting this Factsheet make sure you know t...

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  • Chemistry Factsheet: 183. How To Answer Questions On Enthalpy Changes

    Chemistry Factsheet: 183. How To Answer Questions On Enthalpy Changes

    A good way to begin serious revision for this topic would be tostudy FactSheet 08.If you are revising the Born Haber Cycle at A2 level, then studyFactSheets 28 and 29.The topic always deals with energ...

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  • Chemistry Factsheet: 185. Structure and Function of DNA

    Chemistry Factsheet: 185. Structure and Function of DNA

    DNA or deoxyribonucleic acid is a self-replicating molecule. It passes on genetic information from one generation to the next. Every time a cell divides the genetic information is duplicated and so be...

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  • Chemistry Factsheet: 186. Halogenation in Organic Chemistry

    Chemistry Factsheet: 186. Halogenation in Organic Chemistry

    Halogenation is a chemical reaction that introduces one or more halogen atoms into a molecule. Halogenation can be subdivided into fluorination, chlorination, bromination, and iodination depending on ...

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  • Chemistry Factsheet: 187. Avoidable Errors in Reaction Mechanism Questions

    Chemistry Factsheet: 187. Avoidable Errors in Reaction Mechanism Questions

    The aim of this Factsheet is to enable you to score full marks when answering AS questions on reaction mechanisms.Mechanisms must be written with care: curly arrows, lone pairs, electrical charges and...

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  • Chemistry Factsheet: 188. Equilibrium at AS-Level : Interactively

    Chemistry Factsheet: 188. Equilibrium at AS-Level : Interactively

     The equilibrium between bromine liquid and bromine vapour Read the following description of a series of observations and then answer the self-assessed questions (SAQ) that follow by crossing out...

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  • Chemistry Factsheet: 189. Chemistry of Dyes

    Chemistry Factsheet: 189. Chemistry of Dyes

    A diazonium compound is first made by reacting a primary aromatic (derived from benzene type compounds) amine with excess hydrochloric acid and sodium nitrate(III) [“sodium nitrite”, NaNO2...

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  • Chemistry Factsheet: 190. Rate vs Yield II

    Chemistry Factsheet: 190. Rate vs Yield II

    To succeed in this topic you need to:-• Be able to write balanced equations for reactions• Be familiar with basic concepts related to equilibria and leChatelier’s Principle (Factsheet ...

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