Chemical Reactions and Equations Quiz
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Questions and Answers

What happens when food is cooked?

  • The nature and identity of the food remain the same
  • A chemical change occurs (correct)
  • The food becomes poisonous
  • A physical change occurs

    • Which of the following situations is an example of a chemical change?

  • Food getting digested in our body
  • Grapes getting fermented (correct)
  • Leaving milk at room temperature during summers
  • Leaving an iron tawa/pan/nail exposed to humid atmosphere

    • How do we know that a chemical reaction has taken place?

  • By observing a change in color
  • By observing the formation of a gas
  • By observing the release of energy
  • All of the above (correct)

    • What is the difference between a physical change and a chemical change?

    <p>Physical changes involve a change in the state of matter, while chemical changes involve a change in the composition of matter</p> Signup and view all the answers

    What is the main purpose of the activities mentioned in the text?

    <p>To explain the concept of chemical reactions</p> Signup and view all the answers

    Which of the following is NOT an example of a chemical change?

    <p>An iron tawa/pan/nail left exposed to humid atmosphere</p> Signup and view all the answers

    What is the main difference between a physical change and a chemical change?

    <p>Physical changes involve a change in the state of matter, while chemical changes involve a change in the composition of matter</p> Signup and view all the answers

    What is the purpose of performing activities to observe chemical reactions?

    <p>To determine the nature and identity of the initial substance</p> Signup and view all the answers

    What is the teacher's role in Activity 1.1 mentioned in the text?

    <p>To assist the students in performing the activity</p> Signup and view all the answers

    What is the definition of a chemical reaction?

    <p>A change in the composition of matter</p> Signup and view all the answers

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