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 (B)</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}) (D)</p> Signup and view all the answers

What is the purpose of this exercise?

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

What type of reaction is the combustion of magnesium?

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

What is the product of the reaction in powdered form?

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

What is the purpose of a camera flash?

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

What is the result of magnesium igniting?

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

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

<p>Ignite (B)</p> Signup and view all the answers

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

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

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

<p>Magnesium oxide (B)</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 (C)</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 (B)</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 (B)</p> Signup and view all the answers

What was the historical use of magnesium powder?

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

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

<p>Oxygen (B)</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 (D)</p> Signup and view all the answers

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

<p>Magnesium oxide (D)</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 (B)</p> Signup and view all the answers

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

<p>Magnesium metal (A)</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 (D)</p> Signup and view all the answers

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

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

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

<p>2 (A)</p> Signup and view all the answers

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

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

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

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

What is the correct sequence of representations in this exercise?

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

What is the chemical formula for magnesium oxide?

<p>MgO (D)</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 (B)</p> Signup and view all the answers

Why was magnesium powder used in early camera flashes?

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

What is the correct sequence of representations in this exercise?

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

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

<p>2 (B)</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 (D)</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 (C)</p> Signup and view all the answers

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

<p>2Mg + O2 (A)</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 (A)</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 (A)</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 (B)</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 (D)</p> Signup and view all the answers

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

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

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