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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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  • Chemistry Factsheet: 191. Reactions Producing Stereoisomers

    Chemistry Factsheet: 191. Reactions Producing Stereoisomers

    The stereochemistry of a molecule is extremely important, especially where pharmaceutical products are concerned. Thus it is safe to sell Ibruprofen as a racemate (a 50:50 mixture of enantiomers &ndas...

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  • Chemistry Factsheet: 192. Avoidable Errors in Reaction Mechanisms at A2-Level

    Chemistry Factsheet: 192. Avoidable Errors in Reaction Mechanisms at A2-Level

    The aim of this Factsheet is to enable ‘A2’ level candidates to score full marks when answering A2 questions on reaction mechanisms. Mechanisms must be written with care: curly arrows, dot...

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  • Chemistry Factsheet: 193. Brønsted - Lowry Bases in ‘A’ level Chemistry

    Chemistry Factsheet: 193. Brønsted - Lowry Bases in ‘A' level Chemistry

    The use of the word “base” as a substance that reacts with an acid was first used in 1754 by Rouelle. The term base superseded the word alkali (from the Arabic for “calcined ashes&rd...

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  • Chem Factsheet: 194. How to Answer Questions Involving Entropy and Free Energy Changes of Systems

    Chem Factsheet: 194. How to Answer Questions Involving Entropy and Free Energy Changes of Systems

    This Chem Factsheet covers:(a) entropy (S) as a “measure of disorder” of a substance or system,(b) each term in the relationship ∆G = ∆H – T∆Ssystem and(c) the effe...

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  • Chemistry Factsheet: 195. How to Answer Questions on Isomerism

    Chemistry Factsheet: 195. How to Answer Questions on Isomerism

    To succeed in this topic you need to:-• Be able to interpret molecular, structural and displayed formulas• Be familiar with organic functional groupsAfter working through this Factsheet you ...

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  • Chemistry Factsheet: 196. How to Balance Chemical Equations

    Chemistry Factsheet: 196. How to Balance Chemical Equations

    Chemistry, like all other sciences, is the study of the behaviour ofmaterials. What especially sets chemistry apart from other sciences are chemical reactions. A chemical reaction is a process that le...

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  • Chemistry Factsheet: 197. Why do some Ionic Compounds Dissolve and Some do Not?

    Chemistry Factsheet: 197. Why do some Ionic Compounds Dissolve and Some do Not?

    To succeed in this topic you need to:-• Be familiar with basic enthalpy change definitions includinglattice enthalpy, enthalpy change of solution and enthalpychange of hydration.• Be familia...

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  • Chemistry Factsheet: 198. Answering Questions Involving Entropy Changes

    Chemistry Factsheet: 198. Answering Questions Involving Entropy Changes

    How to Answer Questions Involving Entropy, Entropy Changes and Total Entropy Changes This Factsheet initially covers entropy in a qualitative manner and the factors that affect the entropy (S) of a ...

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