A pollutant in smog is nitrogen dioxide, NO₂. The gas has a reddish brown color and is responsible for the red-brown color associated with this type of air pollution. Nitrogen dioxide is also a contributor to acid rain because when rain passes through air contaminated with NO2, it dissolves and undergoes the following reaction: 3NO2(g) + H₂O → NO(g) + 2H*(aq) + 2NO3(aq). In this reaction, which element is reduced and which is oxidized? OH is both reduced and oxidized. OO is oxidized and H is reduced. O is oxidized and N is reduced. ON is both reduced and oxidized. ON is oxidized and H is reduced. ON is oxidized and O is reduced.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
![**Nitrogen Dioxide and Its Role in Smog and Acid Rain**
A common pollutant in smog is nitrogen dioxide, NO₂. This gas has a reddish-brown color and contributes to the red-brown hue associated with this type of air pollution. In addition to its role in smog, nitrogen dioxide is a precursor to acid rain. When rain interacts with air containing NO₂, it dissolves and undergoes the following chemical reaction:
\[ 3\text{NO}_2(g) + \text{H}_2\text{O} \rightarrow \text{NO}(g) + 2\text{H}^+(aq) + 2\text{NO}_3^-(aq) \]
**Question:**
In this reaction, which element is reduced and which is oxidized?
- H is both reduced and oxidized.
- O is oxidized and H is reduced.
- O is oxidized and N is reduced.
- N is both reduced and oxidized.
- N is oxidized and H is reduced.
- N is oxidized and O is reduced.
**Explanation:**
This question explores the concepts of reduction and oxidation (redox reactions) in a chemical context. Understanding which elements gain or lose electrons will help in identifying the changes in oxidation states.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1ef7f5eb-3b23-4b84-b4d5-64fb4f7f54de%2F1dcc4db0-0410-46c4-a700-63c0ad95cc08%2Fntrx9rb_processed.jpeg&w=3840&q=75)
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