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  • Biology Factsheet: 276. Should we cull the Geese?

    Biology Factsheet: 276. Should we cull the Geese?

    This Factsheet:• Discusses the case for and against culling geese• Discusses why some geese populations are increasing butothers are in decline• Reviews recent exam questions on bird co...

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  • Biology Factsheet: 277. Project frozen dumbo: elephant sperm banks

    Biology Factsheet: 277. Project frozen dumbo: elephant sperm banks

    Zoos remain controversial amongst some conservationists. Somebelieve that they are cruel and should be closed and that the moneysaved should be used to protect species in their natural habitats.Others...

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  • Biology Factsheet: 278. Enzymes and activation energy

    Biology Factsheet: 278. Enzymes and activation energy

    This Factsheet:• Explains the concept of activation energy• Outlines the advantages of using enzymes in industrial processes• Provides examples of the use of enzymes in industrial proce...

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  • Biology Factsheet: 279. Is Earth the only living planet?

    Biology Factsheet: 279. Is Earth the only living planet?

    This Factsheet:• Describes the composition of Earth’s early atmosphere• Explains how life changed Earth’s atmosphere• Discusses the possibility of life on Venus and Mars...

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  • Chemistry Factsheet: 178. Inorganic Reaction Trends

    Chemistry Factsheet: 178. Inorganic Reaction Trends

    The importance of reaction trends in chemistry cannot be overstated. In 1869 Dmitri Ivanovich Mendeleev (1834-1907) published his periodic table of the elements. He did this when only some sixty-odd e...

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  • Chemistry Factsheet: 179. Common Confusions : Structure and Bonding - When, and When Not, to Use IMF

    Chemistry Factsheet: 179. Common Confusions : Structure and Bonding - When, and When Not, to Use IMF

    Structure and Bonding - Likely Candidate ErrorsThe aim of this Factsheet is to enable ‘A’ level candidates to scorefull marks when answering questions on structure and bonding. Towrite ans...

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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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