Chemical Changes Quiz
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Questions and Answers

Which of the following statements is correct regarding the process of biogas production by anaerobic bacteria?

  • Process – B involves a physical change.
  • None of these processes involve any changes.
  • Process – A involves a chemical change. (correct)
  • Both processes A and B involve physical changes.

    • Why does adding cooking oil to water in bottle C create a change that is different from the other two bottles?

  • The oil turns into a solid
  • The oil evaporates quickly
  • The oil increases the volume of water
  • The oil causes a chemical reaction (correct)

    • What is the outcome when the gas produced from the cylinder burns?

  • The gas changes color
  • The gas undergoes a physical change
  • The gas combines with oxygen to form new substances (correct)
  • The gas dissolves in water

    • What happens to the iron nails left in the bottles after being observed for a few days?

    <p>The nails rust</p> Signup and view all the answers

    Which of the following is true about lime water used to test for carbon dioxide?

    <p>Lime water bubbles when carbon dioxide is added</p> Signup and view all the answers

    Upon burning, what type of change occurs in biogas used as fuel?

    <p>A chemical change</p> Signup and view all the answers

    What is a common characteristic of a chemical change?

    <p>Formation of a new substance</p> Signup and view all the answers

    Which process is an example of a chemical change?

    <p>Burning of coal</p> Signup and view all the answers

    What indicates that the burning of a substance is a chemical change?

    <p>Production of heat</p> Signup and view all the answers

    Which situation involves the formation of new substances?

    <p>Spoiled food producing a foul smell</p> Signup and view all the answers

    What occurs when an acid is neutralized with a base?

    <p>Formation of water and salt</p> Signup and view all the answers

    Which process involves the breakdown of ozone into oxygen?

    <p>Protection from ultraviolet radiation</p> Signup and view all the answers

    Why does ultraviolet radiation not harm the earth's surface?

    <p>Because ozone absorbs it, acting as a shield.</p> Signup and view all the answers

    In the equation for rusting of iron, what is the role of water (H2O)?

    <p>It combines with oxygen to form iron oxide (rust).</p> Signup and view all the answers

    How does the presence of moisture in the air affect the process of rusting?

    <p>It speeds up the process of rusting.</p> Signup and view all the answers

    What is a common method to prevent rusting of iron articles?

    <p>Applying a coat of paint or grease on the iron surface.</p> Signup and view all the answers

    How does galvanization help prevent rusting of iron?

    <p>By reacting with oxygen in the air and forming a protective layer.</p> Signup and view all the answers

    Which process can be compared to photosynthesis in terms of being a chemical change?

    <p>The digestion of food.</p> Signup and view all the answers

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