Multiple Choice
What is the oxidation state of the carbonyl carbon in the following molecule?
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13. Alcohols and Carbonyl Compounds
Oxidizing and Reducing Agents
5:15 minutesProblem 5b
Textbook Question
Use oxidation numbers to determine which of the following are redox reactions.
(b) 
Verified step by step guidance1
Identify the oxidation states of each element in the reactants and products. For example, in a compound like H2O, hydrogen typically has an oxidation state of +1 and oxygen -2.
Write down the chemical equation for the reaction you are analyzing. Ensure that all reactants and products are clearly identified.
Assign oxidation numbers to each element in the reactants and products. Remember that the sum of oxidation numbers in a neutral compound is zero, and in an ion, it is equal to the charge of the ion.
Compare the oxidation numbers of each element in the reactants and products. Look for any changes in oxidation numbers, which indicate that a redox reaction has occurred.
Determine which element is oxidized (increase in oxidation number) and which is reduced (decrease in oxidation number). This will confirm the presence of a redox reaction if both oxidation and reduction occur.
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5mKey Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Oxidation Numbers
Oxidation numbers are assigned to atoms in a molecule to indicate the distribution of electrons among them. They help in identifying the oxidation state of an element in a compound, which is crucial for determining electron transfer in redox reactions. Typically, elements in their standard state have an oxidation number of zero, while common rules apply for compounds and ions.
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Redox Reactions
Redox reactions, or oxidation-reduction reactions, involve the transfer of electrons between two species. One species undergoes oxidation (loss of electrons) while the other undergoes reduction (gain of electrons). Identifying changes in oxidation numbers of elements in a reaction helps determine if a redox process has occurred.
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Identifying Redox Reactions
To identify redox reactions, compare the oxidation numbers of elements in the reactants and products. A change in oxidation number indicates a redox process. If an element's oxidation number increases, it is oxidized; if it decreases, it is reduced. This method is essential for distinguishing redox reactions from other types of chemical reactions.
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