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    Chemistry is a branch of science dealing with the structure, composition, properties and reactive characteristics of substances, especially at the atomic and molecular levels. We look at the historical and current developments, applications in everyday life and the social, environmental and economic implications.

    Chemistry is taught as a separate subject by science teachers in Year 7 and by specialist chemistry teachers to all pupils up to Year 11.

    We also have around 100 students studying Chemistry in our Sixth Form.

    At CGS, we have high expectations for our students who achieve excellent results with the majority achieving A* or A grade at GCSE and a A*-B grade at A level.


    Key Stage 3 Chemistry

    Our Key Stage 3 course is based on the 2014 national curriculum.  The course has been designed to help students develop the knowledge and skills required to access the Science GCSEs.  Students study the following Chemistry topics in Year 7 & 8.


    Year 7

    Chemistry Term 1: The particulate nature of matter Chemistry Term 2: Atoms, elements and compounds Chemistry Term 3: Reaction, metals and non-metals

    Matter and its properties The Particle Model
    Particle Behaviour Changing State
    Filtering and evaporation


    Elements and the periodic table
    Groups and periods
    Atoms, Elements and Compounds
    The difference between mixtures and compounds
    Naming compounds
    Chemical sybols and formulae
    Chemical reactions - introduction
    Chemical reactions
    Conservation of mass


    Metals and non-metals
    Reactivity series
    More on the reactivity series
    Properties of metal and non-metal oxides
    Energy changes, endo and exothermic
    Changes – reversible, irreversible,  physical, chemical
    How can we measure changes in a reaction?
    Combustion and thermal decomposition
    Oxidation and reduction

    Year 8

    Chemistry Term 4: Acids and alkalis Chemistry Term 5: Materials and everyday Chemistry Chemistry Term 6: The Earth and atmosphere

    Acids & Alkalis
    Everyday acids and alkalis
    Working safely with acids and alkalis
    Reactions of acids and alkalis
    The importance of neutralisation
    pH scale and indicators
    Making indicators
    Problematic acids
    Acids and metals

    Everyday chemistry
    Where does the waste go?
    Sustainable development
    Composite materials Hydrocarbons and fuels

    The Earth
    Sedimentary rock
    Metamorphic rock
    Igneous rock
    The rock cycle
    The Earth as a resource
    Biofuels and the carbon cycle
    The atmosphere
    Human impact on climate change



    Key Stage 4 (GCSE)

    We begin our Key Stage 4 courses in Year 9.  We follow the AQA GCSE Chemistry course, students studying topics including:

    1. The fundamental ideas in Chemistry

    2. Metals and their uses

    3. Structures and bonding

    4. Crude oil and fuels

    5. Exothermic and endothermic reactions

    6. Atomic structure, analysis and quantitative chemistry

    7. Rates of reaction

    8. The periodic table

    9. Water

    10. Calculating and explaining energy change

    11. The production of ammonia

    12. Alcohols, carboxylic acids and esters

    The GCSE course is designed to build the knowledge base, practical, investigative and research skills required to move on to study A-Level Chemistry.

    Students sit their final exams in the Summer of Year 11. There is also a practical assessment component that, for students sitting their final exams in 2018 and beyond, involves the completion of a series of assessed practical tasks during the course and keeping a record of progress in a lab book.  Students completing their final exams before this date will continue to complete an individual controlled assessment.


    A level Chemistry:  Please see the Sixth Form section of our website: sixth-form-subject-information