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  • Chemistry Factsheet: 208. Calculating pH

    Chemistry Factsheet: 208. Calculating pH

    pH is a measure of the acidity or alkalinity of an aqueous solution with a scale commonly ranging from 0 to 14 and being estimated by indicators (e.g. Universal indicator paper) or measured more accur...

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  • Chemistry Factsheet: 209. Is Bio Ethanol Carbon Neutral?

    Chemistry Factsheet: 209. Is Bio Ethanol Carbon Neutral?

    A carbon neutral process is one that results in ZERO net emissions of carbon dioxide into the atmosphere.This concept has become very important since scientists identified carbon dioxide as a greenhou...

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  • Chemistry Factsheet: 210. Depletion of the Ozone Layer

    Chemistry Factsheet: 210. Depletion of the Ozone Layer

    Ozone (molecular formula O3) is the tri-atomic allotrope of oxygen (O). The more familiar allotrope is the diatomic form, O2. Allotropes are different structural forms of the same element. O2 is commo...

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  • Chemistry Factsheet: 211. How To Calculate Oxidation Numbers

    Chemistry Factsheet: 211. How To Calculate Oxidation Numbers

    From the very early days of chemistry, scientists such as Joseph Priestley and Antoine Lavoisier (1743-1794) were very interested in the behaviour of the element, oxygen. This was probably because it ...

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  • Chemistry Factsheet: 212. Ionisation Energies: Answering Exam Questions

    Chemistry Factsheet: 212. Ionisation Energies: Answering Exam Questions

    Investigating variations in successive ionisation energies for a particular element and first ionisation (I1) values for different elements across the Periodic table gives a lot of information about a...

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  • Chemistry Factsheet: 213. Amino Acids

    Chemistry Factsheet: 213. Amino Acids

    Amino acids are bifunctional compounds because their molecules contain two distinct functional group – the primary amine group (-NH2) and the carboxylic acid group (-COOH). In naturally occurrin...

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  • Chemistry Factsheet: 214. An Interesting Molecule

    Chemistry Factsheet: 214. An Interesting Molecule

    This Chem Factsheet is concerned with applying structural principles and other chemical priciples to the Sarin molecule. Sarin (also called GB) is a notorious organophosphorus compound which has been...

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  • Chemistry Factsheet: 215. Hessís Law for year 1 A Level

    Chemistry Factsheet: 215. Hess's Law for year 1 A Level

    Hess’s Law was first published in 1840 by the Swiss-born Russian chemist Germain Henri Hess. The law states that the total enthalpy change (ΔH) associated with a chemical reaction is inde...

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  • Chemistry Factsheet: 216. Water as a Reagent

    Chemistry Factsheet: 216. Water as a Reagent

    As with all molecules, its basic properties, behaviour and reactions are determined by its structure. Thereafter, its reactivity can be adjusted by varying reaction conditions such as temperature, pre...

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  • Chemistry Factsheet: 217. The reaction mechanism for a free radical substitution reaction

    Chemistry Factsheet: 217. The reaction mechanism for a free radical substitution reaction

    A reaction mechanism is a step by step sequence of elementary reactions by which the overall chemical change occurs. Each step typically shows how electrons move to either break an existing covalent b...

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