Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:### Drawing the Structural Formula for Pentanoic Acid
#### Instructions:
- **You do not have to consider stereochemistry.**
- **You do not have to explicitly draw H atoms.**
#### Tools Available:
The interface provides a range of drawing tools for constructing the structural formula:
- **Selection tool** (hand icon)
- **Eraser**
- **Bond tool (single, double, triple, or other types of bonds)**
- **Ring structures (different kinds)**
- **Chain tool**
- **Plus and minus tools for zooming in and out**
- **Various carbon-based structures and heteroatoms**
The tool being demonstrated in the image is from **ChemDoodle**, a popular software for drawing chemical structures.
#### Example of a Partially Drawn Structure:
- The workspace shows `CH₄` (Methane) as an initial example in the workspace.
#### Step-by-Step Guide to Drawing Pentanoic Acid:
1. **Start with a Carbon Chain**:
- Pentanoic acid has a backbone of five carbon atoms, arranged in a chain. Using the carbon chain tool, draw a zigzag line representing 5 carbon atoms in sequence.
2. **Add Functional Group**:
- At the end of the carbon chain, add a carboxyl group (-COOH) to the first carbon, representing the acid part of pentanoic acid.
3. **Complete the Structure**:
- Ensure that all other bonds not part of the backbone or COOH group are saturated with hydrogen atoms (not explicitly needed in the drawing).
#### Final Structure Representation:
The final structure should look like this (without explicitly drawn hydrogen atoms):
```
H H H H
| | | |
H - C - C - C - C - C = O
| |
H OH
```
This structure represents pentanoic acid (CH₃CH₂CH₂CH₂COOH).
### Additional Tips:
- **Use the appropriate bond tools** to ensure clarity in structural representation.
- **Check all valencies** to make sure the structure is accurate.
- **Utilize zoom and cleaning tools** to tidy up your drawing.
This exercise helps understand organic chemistry principles and the structural composition of carboxylic acids, a crucial functional group in organic compounds.
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