Redox Reactions and Oxidation States Quiz

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Questions and Answers

Which type of chemical reaction involves a change in the oxidation states of a substrate?

  • Acid-base reaction
  • Precipitation reaction
  • Redox reaction (correct)
  • Combustion reaction

What is oxidation in a redox reaction?

  • The decrease in the oxidation state
  • The increase in the oxidation state (correct)
  • The gain of electrons
  • The loss of electrons

What is reduction in a redox reaction?

  • The increase in the oxidation state
  • The loss of electrons
  • The decrease in the oxidation state
  • The gain of electrons (correct)

Which class of redox reactions involves electron transfer?

<p>Atom transfer reactions (D)</p> Signup and view all the answers

What happens to the oxidation state of iron atoms in the rusting of iron?

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

What is redox?

<p>Redox is a type of chemical reaction in which the oxidation states of a substrate change.</p> Signup and view all the answers

What is oxidation?

<p>Oxidation is the loss of electrons or an increase in the oxidation state.</p> Signup and view all the answers

What is reduction?

<p>Reduction is the gain of electrons or a decrease in the oxidation state.</p> Signup and view all the answers

What are the two classes of redox reactions?

<p>The two classes of redox reactions are electron-transfer and atom transfer.</p> Signup and view all the answers

Give an example of an atom transfer redox reaction.

<p>An example of an atom transfer redox reaction is the rusting of iron, where the oxidation state of iron atoms increases as the iron converts to an oxide, and the oxidation state of oxygen decreases as it accepts electrons released by the iron.</p> Signup and view all the answers

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Study Notes

Redox Reactions

  • Redox reactions involve a change in the oxidation states of a substrate.
  • Oxidation in a redox reaction refers to the loss of electrons or an increase in oxidation state.
  • Reduction in a redox reaction refers to the gain of electrons or a decrease in oxidation state.
  • Electron transfer is a class of redox reactions where electrons are transferred from one species to another.
  • In the rusting of iron, iron atoms lose electrons and their oxidation state increases from 0 to +3.
  • Redox is a shortened term used to refer to reduction-oxidation reactions.
  • Oxidation is the process of losing electrons and increasing oxidation state.
  • Reduction is the process of gaining electrons and decreasing oxidation state.
  • The two classes of redox reactions are electron transfer and atom transfer.
  • Atom transfer is a class of redox reactions where atoms are transferred from one species to another, for example, the combustion of methane, where oxygen atoms are transferred from oxygen gas to methane.

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