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

What is the oxidation number of oxygen in most compounds?

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

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

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

What is the oxidation number of hydrogen in metal hydrides?

<p>-1 (C)</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 (D)</p> Signup and view all the answers

What is the characteristic of redox reactions?

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

How do you balance oxygen atoms in a redox reaction?

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

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

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

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

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

What is the oxidation number of fluorine in its compounds?

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

What is the first step in balancing a redox reaction?

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

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

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

What is the consequence of oxidation in a redox reaction?

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

Which of the following is a characteristic of redox reactions?

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

What is the oxidation number of a monatomic ion?

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

What is the oxidation number of oxygen in peroxides?

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

What is the oxidation number of hydrogen in most compounds?

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

What is the result of reduction in a redox reaction?

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

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

<p>0 (D)</p> Signup and view all the answers

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

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

What is the oxidation number of fluorine in its compounds?

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

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

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

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

<p>Combustion of fuels (C)</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 (A)</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 (C)</p> Signup and view all the answers

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

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

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

<p>-1 (D)</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 (A)</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 (A)</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 (A)</p> Signup and view all the answers

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

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

What is the oxidation number of hydrogen in metal hydrides?

<p>-1 (D)</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 (B)</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 (C)</p> Signup and view all the answers

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

<p>All of the above (D)</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 (D)</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 (D)</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 (A)</p> Signup and view all the answers

What is the oxidation number of oxygen in peroxides?

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

Which of the following is an application of redox reactions?

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

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

<p>+1 (C)</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 (B)</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 (D)</p> Signup and view all the answers

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

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

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

<p>-1 (C)</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 (A)</p> Signup and view all the answers

What is the consequence of oxidation in a redox reaction?

<p>Increase in oxidation number (B)</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 (C)</p> Signup and view all the answers

What is the result of reduction in a redox reaction?

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

What is the oxidation number of fluorine in its compounds?

<p>-1 (D)</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 (A)</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 (C)</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 (C)</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 (A)</p> Signup and view all the answers

What is the result of oxidation in a redox reaction?

<p>The substance loses electrons (B)</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 (A)</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 (A)</p> Signup and view all the answers

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

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

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