Chemistry of the atmosphere

    AQA
    GCSE

    This topic explores the evolution of the Earth's atmosphere from its early volcanic origins to its current stable composition, highlighting the pivotal role of photosynthesis in oxygen production and carbon sequestration. It examines the greenhouse effect as a fundamental mechanism for maintaining planetary temperature and analyzes how human activities are enhancing this effect, leading to climate change. Furthermore, the topic investigates the chemistry of combustion, detailing the formation and environmental impact of atmospheric pollutants such as carbon monoxide, sulfur dioxide, and particulates.

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    Objectives
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    Exam Tips
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    Pitfalls
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    Key Terms
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    Learning Objectives

    What you need to know and understand

    • The proportions of different gases in the atmosphere
    • The Earth's early atmosphere
    • How oxygen increased
    • How carbon dioxide decreased
    • Greenhouse gases
    • Human activities which contribute to an increase in greenhouse gases in the atmosphere
    • Global climate change
    • The carbon footprint and its reduction
    • Atmospheric pollutants from fuels
    • Properties and effects of atmospheric pollutants

    Key Terminology

    Essential terms to know

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