Chemical Equations and Formulae
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Questions and Answers

What is the purpose of using chemical formulae instead of words in a chemical equation?

  • To make the equation longer and less useful
  • To make the equation more concise and useful (correct)
  • To make the equation harder to understand
  • To make the equation less accurate

    • What does the law of conservation of mass state?

  • The number of atoms of each element changes before and after a chemical reaction
  • Mass can be created in a chemical reaction
  • Mass can be destroyed in a chemical reaction
  • The total mass of the elements present in the products must be equal to the total mass of the reactants (correct)

    • Why do we need to balance a skeletal chemical equation?

  • To ensure that the number of atoms of each element remains the same before and after a chemical reaction (correct)
  • To violate the law of conservation of mass
  • To create more confusion
  • To make the equation longer

    • How can you determine if a chemical equation is balanced?

    <p>By comparing the number of atoms of each element on both sides of the arrow</p> Signup and view all the answers

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

    <p>It ensures that the number of atoms remains the same before and after a chemical reaction</p> Signup and view all the answers

    What is represented by 'Mg' in a chemical equation?

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

    What is represented by 'O' in a chemical equation?

    <p>Oxygen atom</p> Signup and view all the answers

    What does 'MgO' represent in a chemical equation?

    <p>Magnesium oxide</p> Signup and view all the answers

    What happens if the mass is not the same on both sides of a chemical equation?

    <p>The equation is unbalanced because mass must be equal on both sides</p> Signup and view all the answers

    What word-equation can be represented as Mg + O -> MgO?

    <p>Magnesium + Oxygen -&gt; Magnesium Oxide</p> Signup and view all the answers

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