Match the words in the left column to the appropriate blanks in the sentence on the right. Reset He positive slope On the graph of In[A] versus time, the rate constant, is the of the straight line. y-Intercept A negative slope In[A]:

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### Calculating the Rate Constant for a First-Order Reaction

To determine the rate constant for a first-order reaction from a graph, you can use the following methodology:

#### Instructions

1. **Graph Plotting**:
   - Plot the natural logarithm of the concentration of reactant \([A]\) against time \(t\).
   - The y-axis will represent \(\ln [A]\), and the x-axis will represent time \(t\).

2. **Graph Analysis**:
   - The graph of \(\ln [A]\) versus time will yield a straight line if the reaction is first-order.

#### Matching Concepts to Graph Analysis

**Fill-in-the-Blank Question:**

- **Sentence**: "On the graph of \(\ln[\text{A}]\) versus time, the rate constant, \_\_\_\_, is the \_\_\_\_ of the straight line."

**Options to Fill in the Blanks**:
   - positive slope
   - negative slope
   - y-intercept
   - \(t\)
   - \(A\)
   - \(\ln[A]_t\)
   - \(k\)

**Correct Answers**:
   - First Blank: \(k\)
   - Second Blank: negative slope

**Completed Sentence**: "On the graph of \(\ln[\text{A}]\) versus time, the rate constant, \(k\), is the negative slope of the straight line."

#### Practical Example:

Consider you have graph data where:

- The y-axis (vertical) shows \(\ln [A]\).
- The x-axis (horizontal) shows time \(t\).

Plot the data points, draw the best-fit straight line through these points, and determine the slope of the line. The negative of this slope equals the rate constant \(k\) for the first-order reaction.

#### Conclusion

Understanding how to extract the rate constant from a graphical analysis is crucial in chemical kinetics. This method allows for an accurate determination of reaction rates and understanding of reaction mechanisms.
Transcribed Image Text:### Calculating the Rate Constant for a First-Order Reaction To determine the rate constant for a first-order reaction from a graph, you can use the following methodology: #### Instructions 1. **Graph Plotting**: - Plot the natural logarithm of the concentration of reactant \([A]\) against time \(t\). - The y-axis will represent \(\ln [A]\), and the x-axis will represent time \(t\). 2. **Graph Analysis**: - The graph of \(\ln [A]\) versus time will yield a straight line if the reaction is first-order. #### Matching Concepts to Graph Analysis **Fill-in-the-Blank Question:** - **Sentence**: "On the graph of \(\ln[\text{A}]\) versus time, the rate constant, \_\_\_\_, is the \_\_\_\_ of the straight line." **Options to Fill in the Blanks**: - positive slope - negative slope - y-intercept - \(t\) - \(A\) - \(\ln[A]_t\) - \(k\) **Correct Answers**: - First Blank: \(k\) - Second Blank: negative slope **Completed Sentence**: "On the graph of \(\ln[\text{A}]\) versus time, the rate constant, \(k\), is the negative slope of the straight line." #### Practical Example: Consider you have graph data where: - The y-axis (vertical) shows \(\ln [A]\). - The x-axis (horizontal) shows time \(t\). Plot the data points, draw the best-fit straight line through these points, and determine the slope of the line. The negative of this slope equals the rate constant \(k\) for the first-order reaction. #### Conclusion Understanding how to extract the rate constant from a graphical analysis is crucial in chemical kinetics. This method allows for an accurate determination of reaction rates and understanding of reaction mechanisms.
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