Composition of Air and Gas Testing
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Questions and Answers

What is the primary gas in the air that supports burning?

  • Noble gases
  • Nitrogen
  • Carbon Dioxide
  • Oxygen (correct)
  • The process of photosynthesis produces carbon dioxide as a byproduct.

    False

    What chemical equation represents respiration?

    C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

    The main component of exhaled air that is increased is ________.

    <p>carbon dioxide</p> Signup and view all the answers

    Match the following gases with their effects related to air pollution:

    <p>Sulphur dioxide = Irritation to the eyes Ozone = Causes headaches Nitrogen oxides = Irritation to throat Carbon monoxide = Reduces oxygen transport</p> Signup and view all the answers

    Which gas indicator changes color from purple to yellow, indicating changes in CO₂ levels?

    <p>Hydrogen Carbonate Indicator</p> Signup and view all the answers

    The gas exchange process refers only to the intake of oxygen in the lungs.

    <p>False</p> Signup and view all the answers

    What is the primary purpose of the AQHI (Air Quality Health Index)?

    <p>To inform the public about potential health risks caused by air pollutants.</p> Signup and view all the answers

    Study Notes

    Composition of Air

    • Air is composed of Nitrogen (78%), Oxygen (21%), Carbon Dioxide (0.04%), and Noble Gases (0.9%).
    • Water vapor and other gases are also present in varying amounts.

    Testing for Gases

    • Oxygen: Supports burning; relights a glowing splint.
    • Carbon Dioxide: Supports burning but is denser than air; turns a bicarbonate indicator from red to yellow; turns limewater from colorless to milky.

    Respiration and Photosynthesis

    • Respiration is a process where glucose and oxygen react to produce carbon dioxide and water in living organisms.
    • Photosynthesis is a process where carbon dioxide and water, using sunlight, produce glucose and oxygen in plants.
    • Both processes are related by the exchange of gases (CO2 and O2).

    Respiration Details

    • Respiration involves a series of controlled chemical reactions.
    • The chemical energy stored in glucose is used to support bodily functions.
    • Oxygen is needed and carbon dioxide is removed during cellular respiration.
    • Respiration takes place in cells.

    Photosynthesis Details

    • Photosynthesis uses light energy.
    • Involves converting carbon dioxide and water into glucose and oxygen.
    • Takes place in chloroplasts of plants.
    • The products of photosynthesis provide useful support to the body.
    • Chemical reactions are controlled.

    Human Respiration

    • Air sacs (lungs) are involved in gas exchange.
    • Oxygen inhaled and enters the blood in the capillaries.
    • Carbon dioxide is produced by body cells during respiration. Carried by blood to the air sacs.
    • Carbon dioxide removed when exhaled.
    • Oxygen-carrying ability is crucial for respiration and survival.

    Environmental Impacts of Respiration and Photosynthesis

    • Human activities (e.g., burning fossil fuels and deforestation) disrupt the balance between CO2 and O2 in the atmosphere.
    • This leads to increased greenhouse effect and global warming.
    • Results in climate change and its associated environmental consequences.

    Effects of Pollutants

    • Air pollutants like sulphur dioxide, nitrogen oxides, ozone, and carbon monoxide can irritate the eyes, cause headaches, and affect the respiratory system.
    • They impact human health and cause health concerns.

    Additional Noteworthy Facts

    • Tar deposited in the lungs affects gas exchange efficiency.
    • Dark conditions allow respiration to take place and photosynthesis cannot occur without light.   
    • Respiration occurs constantly, but photosynthesis needs light.

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    Description

    Explore the composition of air, including key gases like nitrogen, oxygen, and carbon dioxide. Understand the processes of respiration and photosynthesis, along with methods to test for various gases. This quiz delves into the importance of these gases in biological systems.

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