Mastering Oxidation and Reduction
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Questions and Answers

Which term is defined as the loss of electrons from atoms of a substance?

  • Oxidation (correct)
  • Polarization
  • Reduction
  • Ionization

In an atom in an ionic compound, which term represents the number of electrons lost or gained by the atom when it forms an ion?

  • Reduction number
  • Mass number
  • Atomic number
  • Oxidation number (correct)

Which substance oxidizes another substance by accepting its electrons?

  • Ionizing agent
  • Oxidizing agent (correct)
  • Polarizing agent
  • Reducing agent

Which substance is considered the reducing agent in a redox reaction?

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

In the reaction 2Al + 2Fe3+ + 3O2– → 2Fe + 2Al3+ + 3O2–, which substance is oxidized?

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

Which element is more electronegative in the redox reaction N2(g) + 3H2(g) → NH3(g)?

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

What is the oxidation number of chlorine (Cl) in potassium chlorate (KClO3)?

<p>+5 (A)</p> Signup and view all the answers

Which of the following best defines oxidation in a redox reaction?

<p>The loss of electrons from atoms of a substance (B)</p> Signup and view all the answers

What is the oxidation number of Cl in the compound Cl2?

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

What is the net ionic equation for the reaction 2KI(aq) + Pb(NO₃)₂ (aq) → PbI₂ (s) + 2KNO₃ (aq)?

<p>2I⁻ (aq) + Pb²⁺ (aq) → PbI₂ (s) (C)</p> Signup and view all the answers

What is the definition of oxidation in a redox reaction?

<p>Oxidation is defined as the loss of electrons from atoms of a substance.</p> Signup and view all the answers

What is the definition of reduction in a redox reaction?

<p>Reduction is defined as the gain of electrons by the atoms of a substance.</p> Signup and view all the answers

What is the oxidation number of an atom in an ionic compound?

<p>The oxidation number represents the number of electrons lost or gained by the atom when it forms an ion.</p> Signup and view all the answers

Define oxidation and reduction?

<p>Oxidation is defined as the loss of electrons from atoms of a substance, while reduction is defined as the gain of electrons by the atoms of a substance.</p> Signup and view all the answers

What are oxidation numbers and how are they used in redox reactions?

<p>Oxidation numbers are tools that scientists use to keep track of the movement of electrons in a redox reaction. The oxidation number of an atom in an ionic compound is the number of electrons lost or gained by the atom when it forms an ion.</p> Signup and view all the answers

What is the net ionic equation for the reaction 2KI(aq) + Pb(NO₃)₂ (aq) → PbI₂ (s) + 2KNO₃ (aq)?

<p>2I⁻ (aq) + Pb²⁺ (aq) → PbI₂ (s)</p> Signup and view all the answers

Define oxidation and reduction in a redox reaction.

<p>Oxidation is the loss of electrons from an atom or molecule, resulting in an increase in oxidation number. Reduction is the gain of electrons by an atom or molecule, resulting in a decrease in oxidation number.</p> Signup and view all the answers

What is the role of an oxidizing agent in a redox reaction?

<p>An oxidizing agent is a substance that accepts electrons from another substance, causing it to be oxidized. It is itself reduced in the reaction.</p> Signup and view all the answers

Explain how electronegativity is related to the strength of oxidizing agents.

<p>Elements with high electronegativity are strong oxidizing agents. They have a high tendency to accept electrons from other substances, making them effective at causing oxidation in a redox reaction.</p> Signup and view all the answers

How can the oxidation number of an element be determined?

<p>The oxidation number of an element can be determined using a set of rules. These rules help assign a charge or oxidation number to each atom in a compound or ion, based on its electron gain or loss.</p> Signup and view all the answers

Match the following terms with their definitions in the context of redox reactions:

<p>Oxidation = The loss of electrons from atoms of a substance Reduction = The gain of electrons by the atoms of a substance Oxidizing Agent = A substance that oxidizes another substance by accepting its electrons Oxidation Number = The number of electrons lost or gained by an atom in an ion</p> Signup and view all the answers

Match the following equations with the correct terms from redox reactions:

<p>Na → Na+ + e– = Oxidation Cl2 + 2e– → 2Cl– = Reduction 2I⁻ (aq) + Pb²⁺ (aq) → PbI₂ (s) = Net Ionic Equation 2KI(aq) + Pb(NO₃)₂ (aq) → PbI₂ (s) + 2KNO₃ (aq) = Complete Ionic Equation</p> Signup and view all the answers

Match the following terms to their correct descriptions in the context of redox reactions:

<p>Oxidizing Agent = A substance that causes oxidation by accepting electrons Reduction = The gain of electrons by an atom or ion Oxidation Number = The charge of an atom or ion after it has gained or lost electrons Spectator Ion = An ion that does not participate in a reaction</p> Signup and view all the answers

Match the following terms with their correct definitions:

<p>Oxidation = The process in which an atom or ion loses electrons Reduction = The process in which an atom or ion gains electrons Oxidizing agent = The substance that oxidizes another substance by accepting its electrons Oxidation number = The number of electrons lost or gained by an atom in an ionic compound</p> Signup and view all the answers

Match the following terms with their correct definitions:

<p>Oxidation = The process in which an atom or ion loses electrons Reduction = The process in which an atom or ion gains electrons Reducing agent = The substance that causes the reduction of another substance by losing its electrons Oxidation number = The number of electrons lost or gained by an atom in an ionic compound</p> Signup and view all the answers

Match the following terms with their correct definitions:

<p>Oxidation = The process in which an atom or ion loses electrons Reduction = The process in which an atom or ion gains electrons Oxidizing agent = The substance that causes the oxidation of another substance by accepting its electrons Oxidation number = The number of electrons lost or gained by an atom in an ionic compound</p> Signup and view all the answers

Match the following terms with their correct definitions in redox reactions:

<p>Oxidizing Agent = The substance that oxidizes another substance by accepting its electrons Reducing Agent = The substance that reduces another substance by losing its electrons Oxidation = A reactant loses an electron. Reducing agent is oxidized. Oxidation number increases Reduction = Other reactant gains an electron. Oxidizing agent X loses an electron. X is the reducing agent and becomes oxidized. The oxidation number of X increases</p> Signup and view all the answers

Match the following elements with their correct oxidation numbers in the given compounds:

<p>Chlorine (Cl) in KClO3 = +5 Sulfur (S) in SO32– = +4 Oxygen (O) in KClO3 = -2 Potassium (K) in KClO3 = +1</p> Signup and view all the answers

Match the following steps in determining oxidation numbers with their correct order:

<p>ANALYZE THE PROBLEM = You are given the reactants and products in the reaction. You must determine the electron transfers that occur SOLVE FOR THE UNKNOWN = Assign the known oxidation numbers to their elements, set the sum of all oxidation numbers to zero or to the ion charge, and solve for the unknown oxidation number EVALUATE THE ANSWER = In this process, aluminum atoms lost electrons and were oxidized, whereas iron ions gained electrons and were reduced KNOWN UNKNOWN = Use the rules for determining oxidation numbers to find the oxidation number of each element in a given compound or ion</p> Signup and view all the answers

Match the following terms with their correct definitions in redox reactions:

<p>Oxidation = The process in which a reactant loses an electron. The reducing agent is oxidized and the oxidation number of the element increases Reduction = The process in which another reactant gains an electron. The oxidizing agent loses an electron and its oxidation number decreases Oxidizing Agent = The substance that is reduced in a redox reaction. It causes the oxidation of another substance by accepting its electrons Reducing Agent = The substance that is oxidized in a redox reaction. It causes the reduction of another substance by losing its electrons</p> Signup and view all the answers

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