Balanced Chemical Equations Quiz
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Questions and Answers

Why is it important for a chemical equation to be balanced?

  • To speed up the reaction
  • To follow the law of conservation of mass (correct)
  • To increase the yield of products
  • To ensure the products are formed correctly

    • What does a balanced chemical equation ensure about the number of atoms of each element?

  • They decrease in the products
  • They increase in the products
  • They remain the same before and after the reaction (correct)
  • They are only balanced in certain reactions

    • What does a double displacement reaction involve?

  • Release of energy in the form of light
  • Exchange of ions between reactants to form new products (correct)
  • Transfer of electrons between reactants
  • Formation of a precipitate in the reaction mixture

    • In a chemical equation, what does oxidation refer to?

    <p>Loss of electrons by a species</p> Signup and view all the answers

    In a double displacement reaction, how do the atoms get rearranged?

    <p>Atoms remain the same, they only change partners</p> Signup and view all the answers

    What type of reaction takes place when barium chloride and sodium sulphate solutions are mixed?

    <p>Double displacement reaction</p> Signup and view all the answers

    What is the product formed when sodium hydroxide solution reacts with hydrochloric acid solution?

    <p>Sodium chloride solution</p> Signup and view all the answers

    Why is it important to balance chemical equations?

    <p>To equalize the mass of reactants and products</p> Signup and view all the answers

    When balancing a chemical equation, why are physical states like (s), (l), (g), and (aq) mentioned?

    <p>To provide information about the physical state of reactants and products.</p> Signup and view all the answers

    In the balanced equation 3Fe(s) + 4H2O(g) → Fe3O4(s) + 4H2(g), why is (g) used with H2O?

    <p>To signify that H2O is present as steam.</p> Signup and view all the answers

    Why are reaction conditions like temperature, pressure, catalyst, etc., sometimes indicated in a chemical equation?

    <p>To provide additional information about the reaction process.</p> Signup and view all the answers

    Why is it mentioned that physical states are usually not included in a chemical equation unless necessary?

    <p>To avoid overcrowding the equation with unnecessary details.</p> Signup and view all the answers

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