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  • Chemistry Factsheet: 204. Chlorine and Chlorates

    Chemistry Factsheet: 204. Chlorine and Chlorates

    Chlorine as an Oxidising AgentChlorine is a strong oxidising agent.An Oxidising agent is a reagent that takes electrons (oxidises) from another species e.g. Cl2 (aq) + 2KI(aq) → 2KCl(aq) + I2(aq)...

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  • Chemistry Factsheet: 205. Applying electrode potential data

    Chemistry Factsheet: 205. Applying electrode potential data

    Reminders from Chem FactSheet 199: 1. Each half equation has an associated standard electrode potential e.g. Cu2+(aq) + 2e-  Cu(s) ; E = +0.34V2. Each electrode potential is measured relative to ...

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  • Chemistry Factsheet: 206. Enthalpy change of neutralisation

    Chemistry Factsheet: 206. Enthalpy change of neutralisation

    Measuring an Enthalpy Change of NeutralisationThis is achieved by a technique called calorimetry.Known quantities of acid and base (alkali) are mixed in a calorimeter. In a simple experiment, a polyst...

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  • Chemistry Factsheet: 207. E-Z Isomerism

    Chemistry Factsheet: 207. E-Z Isomerism

    Isomers are molecules with the same molecular formula but different structural formulas. Structural isomers differ in the sequence in which the atoms are bonded together....

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  •  Environmental Studies Factsheet: 142. The Living Planet Index

    Environmental Studies Factsheet: 142. The Living Planet Index

    WWF (the Worldwide Fund for Nature) has published Living Planet Reports annually since 1998. The report describes the changing state of global biodiversity. One of the two indicators in the report is ...

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  •  Environmental Studies Factsheet: 143. - Shale gas and earthquakes!

    Environmental Studies Factsheet: 143. - Shale gas and earthquakes!

    This Factsheet:• Describes the nature of shale gas• Explains the process and environmental impacts of fracking• Uses shale gas drilling near Blackpool as a Case Study...

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  •  Environmental Studies Factsheet: 144. Mercury in the Arctic

    Environmental Studies Factsheet: 144. Mercury in the Arctic

    Mercury is released naturally into the environment from volcanoes and from rock weathering. Humans release mercury during mining operations but the biggest human source is coal burning. Human sources ...

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  •  Environmental Studies Factsheet: 145. Desalination or a new reservoir for Melbourne?

    Environmental Studies Factsheet: 145. Desalination or a new reservoir for Melbourne?

    This Factsheet describes the arguments for and against increasing Melbourne’s water supply by desalination or via a new reservoir. Desalination involves extracting salt from seawater to increase...

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  •  Environmental Studies Factsheet: 147. Aquatic predator-prey relationships

    Environmental Studies Factsheet: 147. Aquatic predator-prey relationships

    Aquatic habitats such as ponds and streams are convenient to study and commonly feature in exam questions. This Factsheet:• Describes the ecological principles behind aquatic predatorpreyrelation...

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  •  Environmental Studies Factsheet: 148. Can we use beetles instead of herbicides?

    Environmental Studies Factsheet: 148. Can we use beetles instead of herbicides?

    Weeds compete with crops for light, water and soil nutrients. Farmers use herbicides – chemicals that kill weeds e.g. 2,4-D – to reduce this competition and increase the yield of their cro...

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