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  • Chemistry Factsheet: 218. Variations in Gibbs Free Energy

    Chemistry Factsheet: 218. Variations in Gibbs Free Energy

    Introduction The energetic feasibility (also called spontaneity) of a chemical reaction was originally assessed using the enthalpy change (DH) of the reaction.   Note: “Energetic feasib...

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  • Chemistry Factsheet: 219. Isomerism in Transition Metal Complexes

    Chemistry Factsheet: 219. Isomerism in Transition Metal Complexes

    Isomerism is usually associated with organic molecules but the concept also applies to some transition metal complexes....

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  • Chemistry Factsheet: 220. Nucleophilic Substitution v Elimination in Haloalkanes

    Chemistry Factsheet: 220. Nucleophilic Substitution v Elimination in Haloalkanes

    The hydroxide ion is a nucleophile since its oxygen atom has lone pairs of electrons (:) which it can donate to form a new covalent bond....

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  • Chemistry Factsheet: 221. Electrophilic Addition to Alkenes

    Chemistry Factsheet: 221. Electrophilic Addition to Alkenes

    Alkenes are unsaturated hydrocarbons which characteristically contain a carbon-carbon double bond (C=C) which consists of a stronger (sigma) bond and a weaker (pi) bond. ...

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  • Chemistry Factsheet: 222. Compromise Conditions

    Chemistry Factsheet: 222. Compromise Conditions

    Introduction When a chemical substance is manufactured on a large scale, chemical theory can be used to predict the best experimental conditions to maximise the yield of a substance and the rate of p...

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  •  Chemistry Factsheet: 223. Electrophilic Substitution

    Chemistry Factsheet: 223. Electrophilic Substitution

    The term electrophilic substitution refers to a chemical reaction involving an electrophilic species causing a substitution reaction of an organic molecule. More specifically it refers to the mechanis...

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  •  Chemistry Factsheet: 224. Nucleophilic Addition

    Chemistry Factsheet: 224. Nucleophilic Addition

    The term nucleophilic addition refers to a chemical reaction involving a nucleophilic species causing an addition reaction of an organic molecule. More specifically it refers to the mechanism for such...

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  • Chemistry Factsheet: 225. Electrochemical Cells : Concentration Effects

    Chemistry Factsheet: 225. Electrochemical Cells : Concentration Effects

    Typical electrochemical cells encountered at A-level....

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  • Chemistry Factsheet: 226. Carbocations

    Chemistry Factsheet: 226. Carbocations

    “Cation” is the general term for a positively charged ion. Metals generally lose electrons when they react and so form the most common cations such as Na+, Mg2+ and Al3+. However, an ion s...

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  • Chemistry Factsheet: 227.  Fats and Oils

    Chemistry Factsheet: 227. Fats and Oils

    Fats and oils are natural materials found in both animals and plants. They are particularly important for insulation against the cold, protecting body organs against physical shocks, promoting healthy...

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