Gr 9 NATURAL SCIENCES: CH 2.3 The reaction of magnesium with oxygen
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Questions and Answers

What is observed during the reaction of magnesium with oxygen?

  • A loud bang
  • A bright blue flame
  • A bright white flame (correct)
  • A slow release of energy

    • What is formed when magnesium reacts with oxygen?

  • Magnesium sulfate
  • Magnesium hydroxide
  • Magnesium oxide (correct)
  • Magnesium chloride

    • What is the macroscopic representation of the reaction 'before'?

  • Magnesium strip (correct)
  • Oxygen molecules
  • Magnesium oxide molecules
  • White ash of magnesium oxide

    • What is the submicroscopic representation of the reaction 'after'?

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

    What is the symbolic representation of the reaction?

    <p>(2 ext{Mg} + ext{O}_2 ightarrow 2 ext{MgO})</p> Signup and view all the answers

    What is the purpose of this exercise?

    <p>To illustrate the different representations of a chemical reaction</p> Signup and view all the answers

    What type of reaction is the combustion of magnesium?

    <p>Exothermic reaction</p> Signup and view all the answers

    What is the product of the reaction in powdered form?

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

    What is the purpose of a camera flash?

    <p>To produce a brief burst of bright light</p> Signup and view all the answers

    What is the result of magnesium igniting?

    <p>A bright white flame</p> Signup and view all the answers

    What is the term for catching fire or causing to catch fire?

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

    What is the symbolic representation of the reaction of magnesium with oxygen?

    <p>2Mg + O₂ → 2MgO</p> Signup and view all the answers

    What is the product of the reaction of magnesium with oxygen?

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

    What is the submicroscopic representation of the reactants in the reaction of magnesium with oxygen?

    <p>Atoms of magnesium and oxygen</p> Signup and view all the answers

    What is the description of the reaction of magnesium with oxygen?

    <p>Magnesium reacts with oxygen to produce magnesium oxide</p> Signup and view all the answers

    What is the main reason for the combustion of magnesium being highly exothermic?

    <p>The reaction releases a significant amount of energy in the form of light and heat</p> Signup and view all the answers

    What was the historical use of magnesium powder?

    <p>To produce a camera flash</p> Signup and view all the answers

    What is the reactant in the air that reacts with magnesium?

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

    What is the result of the combustion of magnesium in terms of energy?

    <p>Energy is released to the surroundings</p> Signup and view all the answers

    What is the white solid produced during the reaction of magnesium with oxygen?

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

    What is the term for the process of magnesium reacting rapidly with oxygen in the air?

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

    What is the reactant 'Mg' in the symbolic representation of the reaction?

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

    What is the outcome of the reaction between magnesium and oxygen in terms of energy?

    <p>Energy is released</p> Signup and view all the answers

    What type of substance is formed as a result of the reaction?

    <p>Powdery solid</p> Signup and view all the answers

    How many magnesium atoms react with one oxygen molecule according to the chemical equation?

    <p>2</p> Signup and view all the answers

    What is the macroscopic representation of the reaction 'after' completion?

    <p>White ash of magnesium oxide</p> Signup and view all the answers

    What represents the reactants in the submicroscopic representation of the reaction?

    <p>Oxygen molecules and magnesium atoms</p> Signup and view all the answers

    What is the purpose of this exercise in terms of understanding chemical concepts?

    <p>To enhance our grasp of chemical concepts from different perspectives</p> Signup and view all the answers

    What is the correct sequence of representations in this exercise?

    <p>Macroscopic, Submicroscopic, Symbolic</p> Signup and view all the answers

    What is the chemical formula for magnesium oxide?

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

    What is the primary role of oxygen in the combustion of magnesium?

    <p>To react with magnesium forming magnesium oxide</p> Signup and view all the answers

    Why was magnesium powder used in early camera flashes?

    <p>To produce a bright flash of light</p> Signup and view all the answers

    What is the correct explanation for the combustion of magnesium being highly exothermic?

    <p>The reaction releases energy in the form of light and heat</p> Signup and view all the answers

    What is the correct sequence of representations in this exercise?

    <p>Macroscopic, submicroscopic, symbolic</p> Signup and view all the answers

    What is the term for the process of magnesium reacting rapidly with oxygen in the air?

    <p>Combustion process</p> Signup and view all the answers

    What is the outcome of the reaction between magnesium and oxygen in terms of energy?

    <p>Energy is released in the form of light and heat</p> Signup and view all the answers

    How many magnesium atoms react with one oxygen molecule according to the chemical equation?

    <p>2</p> Signup and view all the answers

    What is the primary cause of the bright white flame observed during the combustion of magnesium?

    <p>The rapid release of energy from the reaction</p> Signup and view all the answers

    At the submicroscopic level, what happens to the magnesium atoms during the reaction?

    <p>They combine with oxygen molecules to form magnesium oxide molecules</p> Signup and view all the answers

    What is the symbolic representation of the reactants in the combustion of magnesium?

    <p>2Mg + O2</p> Signup and view all the answers

    What is the main advantage of using multiple representations to understand a chemical reaction?

    <p>It enhances our understanding of chemical concepts from different perspectives</p> Signup and view all the answers

    What is the result of the combustion of magnesium in terms of the energy released?

    <p>Energy is released in the form of light and heat</p> Signup and view all the answers

    What is the relationship between the magnesium strip and the white ash of magnesium oxide?

    <p>The magnesium strip is a reactant, and the white ash is a product</p> Signup and view all the answers

    What is the role of oxygen in the combustion of magnesium?

    <p>It reacts with magnesium to form magnesium oxide</p> Signup and view all the answers

    What is the submicroscopic representation of the products in the combustion of magnesium?

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

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