Problem 27 - Chemistry: An Atoms-Focused Approach

Question

What are the names of these compounds of nitrogen and oxygen? (a) \(\mathrm{NO}_{3} ;\) (b) \(\mathrm{N}_{2} \mathrm{O}_{5} ;\) (c) \(\mathrm{N}_{2} \mathrm{O}_{4} ;\) (d) \(\mathrm{NO}_{2} ;\) (e) \(\mathrm{N}_{2} \mathrm{O}_{3}\) (f) \(\mathrm{NO} ;(\mathrm{g}) \mathrm{N}_{2} \mathrm{O} ;\) (h) \(\mathrm{N}_{4} \mathrm{O}\)

Step-by-Step Solution

Answer

(a) NO₃ (b) N₂O₅ (c) N₂O₄ (d) NO₂ (e) N₂O₃ (f) NO (g) N₂O (h) N₄O Answer: (a) Nitrogen trioxide (b) Dinitrogen pentoxide (c) Dinitrogen tetroxide (d) Nitrogen dioxide (e) Dinitrogen trioxide (f) Nitrogen monoxide (g) Dinitrogen monoxide (h) Tetranitrogen monoxide

Step 1: Identify the compound elements

In each of these chemical formulas, we have two elements which are nitrogen (N) and oxygen (O).

Step 2: Use the prefix system for naming the compounds

We will now use the prefix system to assign a name to each of the listed compounds. (a) \(\mathrm{NO}_{3}\) The formula contains one nitrogen atom and three oxygen atoms. Name: Nitrogen trioxide (b) \(\mathrm{N}_{2} \mathrm{O}_{5}\) The formula contains two nitrogen atoms and five oxygen atoms. Name: Dinitrogen pentoxide (c) \(\mathrm{N}_{2} \mathrm{O}_{4}\) The formula contains two nitrogen atoms and four oxygen atoms. Name: Dinitrogen tetroxide (d) \(\mathrm{NO}_{2}\) The formula contains one nitrogen atom and two oxygen atoms. Name: Nitrogen dioxide (e) \(\mathrm{N}_{2} \mathrm{O}_{3}\) The formula contains two nitrogen atoms and three oxygen atoms. Name: Dinitrogen trioxide (f) \(\mathrm{NO}\) The formula contains one nitrogen atom and one oxygen atom. Name: Nitrogen monoxide (g) \(\mathrm{N}_{2} \mathrm{O}\) The formula contains two nitrogen atoms and one oxygen atom. Name: Dinitrogen monoxide (h) \(\mathrm{N}_{4} \mathrm{O}\) The formula contains four nitrogen atoms and one oxygen atom. Name: Tetranitrogen monoxide

Key Concepts

Nitrogen Compounds

Nitrogen compounds are diverse and essential in chemistry. They are formed by the combination of nitrogen atoms with other elements. Nitrogen can share, gain, or lose electrons when reacting with other elements. In this exercise, nitrogen combines with oxygen to form different compounds. These compounds are called nitrogen oxides. They are important in many natural processes and industrial applications.
The way nitrogen bonds with oxygen dictates the properties of each compound. For example, nitrogen dioxide (\( \text{NO}_{2} \)) is a brown gas and a significant air pollutant. In contrast, dinitrogen monoxide (\( \text{N}_{2} \text{O} \)) is the laughing gas used in medicine and industry.
Nitrogen oxides also play a role in atmospheric reactions. They can contribute to photochemical smog and acid rain. Understanding their chemical behavior is crucial for both environmental and industrial chemistry.

Prefix System

The prefix system is crucial for naming compounds accurately and unambiguously. It helps chemists communicate the exact composition of a compound using standard names. Here’s how it works:

• "Mono-" is used for one atom (e.g., NO is nitrogen monoxide).
• "Di-" indicates two atoms (e.g., \( \text{N}_{2}\text{O}_{3} \) is dinitrogen trioxide).
• "Tri-" is used for three atoms (e.g., \( \text{N}_{2}\text{O}_{3} \) has this prefix).
• "Tetra-" signals four atoms (e.g., \( \text{N}_{2}\text{O}_{4} \) is dinitrogen tetroxide).
• "Penta-" for five atoms (e.g., \( \text{N}_{2}\text{O}_{5} \) is dinitrogen pentoxide).

When naming compounds, we first look at the number of atoms of each element. The prefixes describe the number of atoms in the compound. This system ensures clear communication and avoids confusion with similar compounds.

Oxides of Nitrogen

Oxides of nitrogen are a group of compounds containing only nitrogen and oxygen. They occur naturally and from human activities such as burning fossil fuels. The primary oxides of nitrogen include:

• Nitrogen monoxide (\( \text{NO} \))
• Nitrogen dioxide (\( \text{NO}_{2} \))
• Dinitrogen tetroxide (\( \text{N}_{2}\text{O}_{4} \))
• Dinitrogen pentoxide (\( \text{N}_{2}\text{O}_{5} \))
• Dinitrogen monoxide (\( \text{N}_{2}\text{O} \))
• Nitrogen trioxide (\( \text{NO}_{3} \), though less common)

Each oxide has unique properties and roles in both chemistry and environmental science. For instance, nitrogen monoxide is colorless and reacts with oxygen to form nitrogen dioxide, a harmful air pollutant.
Oxides of nitrogen also influence the greenhouse effect and global warming. Understanding their chemistry helps in developing strategies to reduce pollution and mitigate climate change impacts.

Chemical Formulas

Chemical formulas are shorthand representations of compounds. They provide information about the elements and the number of atoms in each compound. For nitrogen oxides, chemical formulas are written based on the number of nitrogen and oxygen atoms present.
A chemical formula helps chemists understand the structure and composition of a compound quickly. For instance, for \( \text{N}_{2}\text{O}_{5} \), the formula tells us there are two nitrogen atoms and five oxygen atoms. This detail helps predict the compound's behavior and reactions.
In writing chemical formulas, the element with a lower electronegativity is usually written first. This is why nitrogen appears before oxygen in all nitrogen oxide formulas.
Mastering chemical formulas is essential for diagnosing chemical reactions, balancing equations, and understanding molecular interactions.