The Fascinating World of Gases
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Questions and Answers

What is a simple test for identifying oxygen?

  • It turns hydrogencarbonate indicator from red to yellow
  • It relights a glowing splint (correct)
  • It changes dry cobalt chloride paper from blue to pink
  • It turns limewater from colorless to milky

    • How can carbon dioxide be identified?

  • It changes dry cobalt chloride paper from blue to pink
  • It turns limewater from colorless to milky (correct)
  • It turns hydrogencarbonate indicator from red to yellow
  • It relights a glowing splint

    • What is the main use of oxygen in industrial applications?

  • Fire extinguishing
  • Metal cutting (correct)
  • Production of fog effects
  • Assisting in breathing difficulties

    • In what form is solid carbon dioxide commonly known?

    <p>Dry ice</p> Signup and view all the answers

    What is a characteristic of neon mentioned in the text?

    <p>Changes directly to a gas at room temperature</p> Signup and view all the answers

    Which gas is mentioned to be denser than air?

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

    What is the focus of Experiment 7.2 mentioned in the text?

    <p>Testing for water and water vapor</p> Signup and view all the answers

    What is the reason mentioned for the lack of simple tests for nitrogen and noble gases?

    <p>Due to their unreactive nature</p> Signup and view all the answers

    Which gas is mentioned to be used in the production of fog effects?

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

    What is the application of solid carbon dioxide mentioned in the text?

    <p>Used for cooling and creating a fog effect</p> Signup and view all the answers

    What is the application of neon mentioned in the text?

    <p>Used in advertising lights</p> Signup and view all the answers

    What is a test for water and water vapor mentioned in the text?

    <p>Using dry cobalt chloride paper and hot water</p> Signup and view all the answers

    What is air made up of?

    <p>Nitrogen, oxygen, carbon dioxide, noble gases, water vapour, and small amounts of other gases</p> Signup and view all the answers

    What is the main component of the Earth's atmosphere?

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

    What is the percentage of nitrogen in air?

    <p>78%</p> Signup and view all the answers

    Which gas is found in small amounts in the air?

    <p>Noble gases</p> Signup and view all the answers

    What is the layer of air surrounding the Earth called?

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

    What is essential to living things according to the text?

    <p>Layer of air</p> Signup and view all the answers

    What is the percentage of oxygen in air?

    <p>21%</p> Signup and view all the answers

    What gas is mentioned to be denser than air?

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

    What is the main use of oxygen in industrial applications?

    <p>Supporting combustion</p> Signup and view all the answers

    What is the application of solid carbon dioxide mentioned in the text?

    <p>Creating fog effects</p> Signup and view all the answers

    What is a test for the gases in air according to the text?

    <p>Studying their properties</p> Signup and view all the answers

    Who discovered oxygen according to the text?

    <p>Joseph Priestley</p> Signup and view all the answers

    Study Notes

    Properties and Applications of Gases in Air

    • Experiment 7.1 involves testing for oxygen and carbon dioxide using various methods such as observing color, smell, and reaction with indicators.
    • Experiment 7.2 focuses on testing for water and water vapor using dry cobalt chloride paper and hot water.
    • Oxygen can be identified as it relights a glowing splint and causes a burning splint to burn more brightly.
    • Carbon dioxide can be identified as it turns hydrogencarbonate indicator from red to yellow and turns limewater from colorless to milky.
    • There are no simple tests for nitrogen and noble gases due to their unreactive nature.
    • A checkpoint question involves identifying a gas based on its reaction with specific tests.
    • Oxygen is used to assist in breathing difficulties and in industrial applications such as metal cutting and fire extinguishing.
    • Carbon dioxide is denser than air and is used in fire extinguishers and in the production of fog effects.
    • Solid carbon dioxide (dry ice) changes directly to a gas at room temperature and is used for cooling and creating a fog effect.
    • Neon is used in advertising lights.

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    Science 7.1 Air PDF

    Description

    Test your knowledge of the properties and applications of gases in air with this quiz. Explore experiments to test for oxygen, carbon dioxide, water, and water vapor, and learn about the unique characteristics of nitrogen and noble gases. Discover the practical uses of oxygen, carbon dioxide, and neon in various industrial and everyday applications.

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