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    PracticeAQA GCSEAQA GCSE Chemistry Higher Tier Paper 2Question 05.2
    Easy2 marksStructured
    Chemistry of the atmosphereHigheratmospheric chemistrycombustionclimate change

    AQA GCSE · Question 05.2 · Chemistry of the atmosphere

    Table 2Natural gasHydrogenFuelEnergy released in kJ11.937.1Mass of carbon dioxideproduced in grams0.001.83Mass of water vapourproduced in grams0.751.50Mass of oxides of nitrogenproduced in grams6.6 × 10⁻⁴4.9 × 10⁻⁴

    Explain one positive impact on the environment of burning hydrogen rather than natural gas as a fuel. Use Table 2.

    How to approach this question

    1. Look at Table 2 and find a product that is environmentally damaging. 2. Compare the amount of this product produced by hydrogen versus natural gas. 3. Identify the case where hydrogen is "better" (produces less of a harmful substance). 4. State the harmful substance and explain *why* it is harmful to the environment.

    Full Answer

    Burning hydrogen produces no carbon dioxide (0.00 g). Carbon dioxide is a greenhouse gas which contributes to global warming/climate change. Therefore, using hydrogen helps to reduce the greenhouse effect.
    By examining Table 2, we can compare the combustion products of hydrogen and natural gas. - The row for "Mass of carbon dioxide produced" shows that burning 1 dm³ of hydrogen produces 0.00 g of CO₂, while natural gas produces 1.83 g. - This is a significant positive impact because hydrogen fuel does not contain carbon atoms (it is just H₂), so it cannot produce carbon dioxide upon combustion. The only product is water (2H₂ + O₂ → 2H₂O). - Carbon dioxide is a major greenhouse gas. It traps infrared radiation in the atmosphere, leading to an increase in the Earth's average temperature, known as global warming or climate change. - Therefore, using hydrogen as a fuel instead of natural gas (which is mostly methane, CH₄) would eliminate these CO₂ emissions and help to mitigate climate change.

    Common mistakes

    ✗ Just stating "it produces no carbon dioxide" without explaining the environmental consequence. ✗ Discussing other products like water or nitrogen oxides without focusing on a clear positive impact. ✗ Not using the data from the table to support the answer.
    Question 05.1All questionsQuestion 05.3

    Practice the full AQA GCSE Chemistry Higher Tier Paper 2

    48 questions · hints · full answers · grading

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