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Gr 11 Physical Sciences: Ch 11.3 Redox reactions
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Gr 11 Physical Sciences: Ch 11.3 Redox reactions

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Questions and Answers

What is the process of losing electrons by a molecule, atom, or ion called?

  • Synthesis
  • Decomposition
  • Oxidation (correct)
  • Reduction

    • What is the result of reduction in a redox reaction?

  • Decrease in oxidation state (correct)
  • No change in oxidation state
  • Loss of electrons
  • Increase in oxidation state

    • What is the oxidation number of any pure element?

  • +1
  • -1
  • +2
  • 0 (correct)

    • What is the sum of oxidation numbers for all atoms in a neutral molecule?

    <p>0</p> Signup and view all the answers

    What is the oxidation number of oxygen in most compounds?

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

    What is the term for the process of gaining electrons by a molecule, atom, or ion?

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

    What is the purpose of assigning oxidation numbers to atoms in a molecule or ion?

    <p>To track electron transfer in redox reactions</p> Signup and view all the answers

    What is the term for the combination of oxidation and reduction reactions?

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

    What is the oxidation number of hydrogen in metal hydrides?

    <p>-1</p> Signup and view all the answers

    What is the rule for determining the oxidation number of an atom in a compound?

    <p>The sum of oxidation numbers in a compound or ion must match the overall charge</p> Signup and view all the answers

    What is the characteristic of redox reactions?

    <p>A change in oxidation numbers of the reacting species</p> Signup and view all the answers

    How do you balance oxygen atoms in a redox reaction?

    <p>Add water molecules</p> Signup and view all the answers

    What is used to balance hydrogen atoms in a basic medium?

    <p>OH- ions</p> Signup and view all the answers

    What is an example of a redox reaction in biological systems?

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

    What is the purpose of balancing redox reactions?

    <p>To ensure the number of electrons lost in oxidation equals the number of electrons gained in reduction</p> Signup and view all the answers

    What is the oxidation number of fluorine in its compounds?

    <p>-1</p> Signup and view all the answers

    What is the first step in balancing a redox reaction?

    <p>Write the half-reactions</p> Signup and view all the answers

    What is an example of a redox reaction in chemical processes?

    <p>All of the above</p> Signup and view all the answers

    What is the consequence of oxidation in a redox reaction?

    <p>An increase in oxidation state</p> Signup and view all the answers

    Which of the following is a characteristic of redox reactions?

    <p>The transfer of electrons between substances</p> Signup and view all the answers

    What is the purpose of assigning oxidation numbers to atoms in a molecule?

    <p>To track electron transfer in redox reactions</p> Signup and view all the answers

    What is the oxidation number of a monatomic ion?

    <p>Equal to the charge of the ion</p> Signup and view all the answers

    What is the oxidation number of oxygen in peroxides?

    <p>-1</p> Signup and view all the answers

    What is the oxidation number of hydrogen in most compounds?

    <p>+1</p> Signup and view all the answers

    What is the result of reduction in a redox reaction?

    <p>A decrease in oxidation state</p> Signup and view all the answers

    Which step comes after balancing atoms in each half-reaction when balancing redox reactions?

    <p>Balance oxygen atoms</p> Signup and view all the answers

    What is the sum of oxidation numbers for all atoms in a polyatomic ion?

    <p>Equal to the charge of the ion</p> Signup and view all the answers

    What is the purpose of using H+ ions in acidic medium when balancing redox reactions?

    <p>To balance hydrogen atoms</p> Signup and view all the answers

    What is the oxidation number of hydrogen in its elemental state?

    <p>0</p> Signup and view all the answers

    What type of reaction involves a change in oxidation numbers of the reacting species?

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

    In what type of medium do you use OH- ions to balance hydrogen atoms when balancing redox reactions?

    <p>Basic medium</p> Signup and view all the answers

    What is the oxidation number of fluorine in its compounds?

    <p>-1</p> Signup and view all the answers

    Which process involves the oxidation of glucose and the reduction of oxygen?

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

    What is the result of assigning oxidation numbers to atoms in a compound?

    <p>To understand the behavior of substances during chemical reactions</p> Signup and view all the answers

    What is an example of a redox reaction in chemical processes?

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

    What is the purpose of balancing redox reactions?

    <p>To understand the behavior of substances during chemical reactions</p> Signup and view all the answers

    What is the oxidation state of an atom that gains an electron in a redox reaction?

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

    What is the term used to describe the combination of oxidation and reduction reactions?

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

    What is the rule for determining the oxidation number of an atom in a compound?

    <p>The sum of oxidation numbers is always zero</p> Signup and view all the answers

    What is the purpose of assigning oxidation numbers to atoms in a molecule or ion?

    <p>To track electron transfer in redox reactions</p> Signup and view all the answers

    What is the oxidation number of oxygen in peroxides, such as H2O2?

    <p>-1</p> Signup and view all the answers

    In a redox reaction, what is the relationship between the substance that loses electrons and the substance that gains electrons?

    <p>One substance is oxidized and the other is reduced</p> Signup and view all the answers

    What is the characteristic of redox reactions that distinguishes them from other chemical reactions?

    <p>Involve a change in oxidation states</p> Signup and view all the answers

    What is the oxidation number of a monatomic ion, such as Na+?

    <p>Equal to the charge of the ion</p> Signup and view all the answers

    Which of the following elements always has an oxidation number of -1 in its compounds?

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

    What is the oxidation number of hydrogen in metal hydrides?

    <p>-1</p> Signup and view all the answers

    Which step is used to balance the charges in half-reactions when balancing redox reactions?

    <p>Add electrons to one side of each half-reaction</p> Signup and view all the answers

    What is the purpose of balancing redox reactions?

    <p>To ensure the number of electrons lost in oxidation equals the number gained in reduction</p> Signup and view all the answers

    What is an example of a redox reaction in daily life?

    <p>All of the above</p> Signup and view all the answers

    Which of the following is a characteristic of redox reactions?

    <p>Change in oxidation numbers of the reacting species</p> Signup and view all the answers

    What is used to balance hydrogen atoms in an acidic medium when balancing redox reactions?

    <p>H+ ions</p> Signup and view all the answers

    Which step comes after balancing atoms in each half-reaction when balancing redox reactions?

    <p>Balance oxygen atoms</p> Signup and view all the answers

    What is the oxidation number of oxygen in peroxides?

    <p>-1</p> Signup and view all the answers

    Which of the following is an application of redox reactions?

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

    What is the oxidation number of hydrogen in a compound, except in metal hydrides?

    <p>+1</p> Signup and view all the answers

    What is the step that follows balancing atoms in each half-reaction when balancing redox reactions?

    <p>Balance the charges</p> Signup and view all the answers

    What is the purpose of using water molecules to balance oxygen atoms in acidic medium?

    <p>To balance oxygen atoms</p> Signup and view all the answers

    What is the characteristic that distinguishes redox reactions from other chemical reactions?

    <p>Change in oxidation numbers</p> Signup and view all the answers

    What is the oxidation number of oxygen in peroxides, such as H2O2?

    <p>-1</p> Signup and view all the answers

    What is the purpose of multiplying the half-reactions by appropriate coefficients when balancing redox reactions?

    <p>To equalize the number of electrons</p> Signup and view all the answers

    What is the consequence of oxidation in a redox reaction?

    <p>Increase in oxidation number</p> Signup and view all the answers

    What is the term used to describe the process of assigning oxidation numbers to atoms in a compound?

    <p>Oxidation number assignment</p> Signup and view all the answers

    What is the result of reduction in a redox reaction?

    <p>Gain of electrons</p> Signup and view all the answers

    What is the oxidation number of fluorine in its compounds?

    <p>-1</p> Signup and view all the answers

    What is the oxidation state of an atom that loses an electron in a redox reaction?

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

    Which of the following rules is not applicable when determining oxidation numbers?

    <p>The oxidation number of an element in its elemental state is always -1</p> Signup and view all the answers

    What is the purpose of assigning oxidation numbers in a redox reaction?

    <p>To track the transfer of electrons</p> Signup and view all the answers

    What is the characteristic of redox reactions that distinguishes them from other chemical reactions?

    <p>Involves the transfer of electrons</p> Signup and view all the answers

    What is the result of oxidation in a redox reaction?

    <p>The substance loses electrons</p> Signup and view all the answers

    Which of the following statements is true about oxidation numbers?

    <p>The oxidation number of an element in its elemental state is always zero</p> Signup and view all the answers

    What is the relationship between the substance that loses electrons and the substance that gains electrons in a redox reaction?

    <p>The substance that loses electrons is the reducing agent, while the substance that gains electrons is the oxidizing agent</p> Signup and view all the answers

    Which of the following is an example of a redox reaction in biological systems?

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

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