Chemical Reactions in Class 10
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Questions and Answers

Which of the following best describes a chemical reaction?

  • The transformation of a substance into a new and completely different substance (correct)
  • A change in state from solid to liquid
  • The rearrangement of atoms without forming a new substance
  • A physical change in properties of a substance
  • What is the term used to describe the substances that take part in a chemical reaction?

  • Agitators
  • Reactors
  • Catalysts
  • Reactants (correct)
  • In the context of chemical reactions, what does the evolution of gas typically indicate?

  • The release of energy
  • The formation of a solid product
  • The occurrence of a chemical reaction (correct)
  • The consumption of oxygen
  • What is the purpose of cleaning the magnesium ribbon before burning it in air?

    <p>To remove the protective layer of basic magnesium carbonate</p> Signup and view all the answers

    What is the main purpose of a chemical equation?

    <p>To represent a chemical reaction using symbols and formulae</p> Signup and view all the answers

    What is the difference between a balanced and unbalanced chemical equation?

    <p>The balanced equation has equal numbers of atoms of each element on both sides, while the unbalanced equation does not</p> Signup and view all the answers

    Which characteristic of a chemical reaction is NOT represented by a chemical equation?

    <p>Change in state of substance</p> Signup and view all the answers

    What do the reactants and products represent in a chemical equation?

    <p>Reactants represent the substances before the reaction, while products represent the substances after the reaction</p> Signup and view all the answers

    Which law is adhered to when creating a balanced chemical equation?

    <p>Law of Conservation of Mass</p> Signup and view all the answers

    What type of information is generally written above the arrow in a chemical equation?

    <p>Conditions for the reaction to occur</p> Signup and view all the answers

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