Logical Fallacies worksheet for identifying rhetorical devices and fallacies in statements.
Worksheet titled "Logical Fallacies" with a table for identifying rhetorical devices and fallacies, including statements like "You cannot believe anything in this book because it's written by a Trump supporter."
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Step-by-step solution for: Logical Fallacies in Four Articles worksheet
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Show Answer Key & Explanations
Step-by-step solution for: Logical Fallacies in Four Articles worksheet
Let's go through each statement one by one, identify whether it is a rhetorical device or a logical fallacy, and then specify the type.
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- Device/Fallacy: Ad Hominem (circumstantial)
- Type: Fallacy
- Explanation: This attacks the author’s identity (being a Trump supporter) instead of addressing the content of the book. It dismisses the argument based on the person's affiliation rather than evaluating the evidence.
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- Device/Fallacy: Rhetorical Device
- Type: Objective Tone / Impersonal Language
- Explanation: This is a stylistic choice to sound neutral or unbiased. It’s not a logical fallacy—it's a technique used to enhance perceived objectivity, even if the content may still be subjective.
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- Device/Fallacy: Appeal to Authority / False Dilemma
- Type: Fallacy
- Explanation:
- First, "Satanist Quarterly" is likely a made-up or satirical source—this is an appeal to false authority.
- Second, the conclusion ("there is no God") doesn’t logically follow from statistical data about belief. That’s a non sequitur.
- Also, it assumes that atheism = proof of no God, which is a false dichotomy (either God exists or doesn't; but belief ≠ existence).
- So, multiple fallacies here: Appeal to False Authority, Non Sequitur, and False Dilemma.
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- Device/Fallacy: Rhetorical Device
- Type: Metaphor / Analogy
- Explanation: This is a metaphorical comparison to evoke emotion or imagery. It's not a logical fallacy per se, but could be seen as hyperbole or emotive language. However, since it’s a rhetorical strategy to influence perception, it's classified as a rhetorical device.
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- Device/Fallacy: Rhetorical Device
- Type: Generalization / Overgeneralization (if misused)
- Explanation: On the surface, this is just a summary of data. But if "most" is vague or misleading, it might be a hasty generalization. However, as stated, it's neutral and descriptive. So, unless context suggests otherwise, it's best labeled as a rhetorical device for summarizing trends.
> Note: If the term "success" is undefined or biased, it could become a fallacy, but here we assume it's used fairly.
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- Device/Fallacy: Rhetorical Device
- Type: Truism / Cliché
- Explanation: This is a common saying meant to promote compromise or balance. While it sounds wise, it's often misleading because it assumes the "truth" is always a midpoint between two opposing views (which isn't necessarily true). But since it's widely used as a rhetorical cliché, it's best categorized as a rhetorical device.
> Bonus note: This can also be a fallacy if used to avoid critical analysis — false compromise.
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- Device/Fallacy: Slippery Slope
- Type: Fallacy
- Explanation: This claims that one action (using stem cells) will inevitably lead to a drastic outcome (human cloning), without providing evidence for such a chain of events. It’s a classic slippery slope fallacy.
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- Device/Fallacy: Rhetorical Device
- Type: Hyperbole / Exaggeration
- Explanation: The phrase “a little uncomfortable” is understated, but the temperature (115°F) is extreme. This is irony or understatement (litotes), possibly used for effect. It's not a logical fallacy but a rhetorical device to emphasize discomfort.
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- Device/Fallacy: Post Hoc Ergo Propter Hoc
- Type: Fallacy
- Explanation: This assumes that because one event followed another (scratch → fever), the first caused the second. But correlation does not imply causation. This is a post hoc fallacy.
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| STATEMENT | DEVICE/FALLACY | TYPE |
|----------|----------------|------|
| "You cannot believe anything in this book because it's written by a Trump supporter." | Ad Hominem (Circumstantial) | Fallacy |
| Using 3rd person pronouns to give the appearance that information is more objective. | Rhetorical Device | Objective Tone / Impersonal Language |
| "Satanist Quarterly reports that 87% of Americans are atheists. Therefore there is no God." | Appeal to False Authority + Non Sequitur | Fallacy |
| In enforcing its patents so harshly, Monsanto Company acted as a feudal king demanding heavy taxes from his subjects. | Rhetorical Device | Metaphor / Analogy |
| The general trend in the data shows that most of the experiments were a success. | Rhetorical Device | Generalization (Neutral Summary) |
| There are three sides to every story: your story, my story and the truth that lies in the middle. | Rhetorical Device | Truism / Cliché |
| "Embryonic stem cells used for research will lead to full-scale reproductive human cloning." | Slippery Slope | Fallacy |
| It gets a little uncomfortable in the sun on those 115-degree summer afternoon. | Rhetorical Device | Hyperbole / Understatement |
| Joan was scratched by a cat... The cat's scratch therefore caused the fever. | Post Hoc Ergo Propter Hoc | Fallacy |
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- Rhetorical devices are tools used to persuade or style language. They’re not inherently flawed.
- Logical fallacies are errors in reasoning that weaken arguments.
- Some entries (like #3 and #6) could be debated, but the above classifications reflect standard logic and rhetoric.
Let me know if you'd like this formatted as a printable table!
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1. "You cannot believe anything in this book because it's written by a Trump supporter."
- Device/Fallacy: Ad Hominem (circumstantial)
- Type: Fallacy
- Explanation: This attacks the author’s identity (being a Trump supporter) instead of addressing the content of the book. It dismisses the argument based on the person's affiliation rather than evaluating the evidence.
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2. Using 3rd person pronouns to give the appearance that information is more objective.
- Device/Fallacy: Rhetorical Device
- Type: Objective Tone / Impersonal Language
- Explanation: This is a stylistic choice to sound neutral or unbiased. It’s not a logical fallacy—it's a technique used to enhance perceived objectivity, even if the content may still be subjective.
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3. "Satanist Quarterly reports that 87% of Americans are atheists. Therefore there is no God."
- Device/Fallacy: Appeal to Authority / False Dilemma
- Type: Fallacy
- Explanation:
- First, "Satanist Quarterly" is likely a made-up or satirical source—this is an appeal to false authority.
- Second, the conclusion ("there is no God") doesn’t logically follow from statistical data about belief. That’s a non sequitur.
- Also, it assumes that atheism = proof of no God, which is a false dichotomy (either God exists or doesn't; but belief ≠ existence).
- So, multiple fallacies here: Appeal to False Authority, Non Sequitur, and False Dilemma.
---
4. In enforcing its patents so harshly, Monsanto Company acted as a feudal king demanding heavy taxes from his subjects.
- Device/Fallacy: Rhetorical Device
- Type: Metaphor / Analogy
- Explanation: This is a metaphorical comparison to evoke emotion or imagery. It's not a logical fallacy per se, but could be seen as hyperbole or emotive language. However, since it’s a rhetorical strategy to influence perception, it's classified as a rhetorical device.
---
5. The general trend in the data shows that most of the experiments were a success.
- Device/Fallacy: Rhetorical Device
- Type: Generalization / Overgeneralization (if misused)
- Explanation: On the surface, this is just a summary of data. But if "most" is vague or misleading, it might be a hasty generalization. However, as stated, it's neutral and descriptive. So, unless context suggests otherwise, it's best labeled as a rhetorical device for summarizing trends.
> Note: If the term "success" is undefined or biased, it could become a fallacy, but here we assume it's used fairly.
---
6. There are three sides to every story: your story, my story and the truth that lies in the middle.
- Device/Fallacy: Rhetorical Device
- Type: Truism / Cliché
- Explanation: This is a common saying meant to promote compromise or balance. While it sounds wise, it's often misleading because it assumes the "truth" is always a midpoint between two opposing views (which isn't necessarily true). But since it's widely used as a rhetorical cliché, it's best categorized as a rhetorical device.
> Bonus note: This can also be a fallacy if used to avoid critical analysis — false compromise.
---
7. "Embryonic stem cells used for research will lead to full-scale reproductive human cloning."
- Device/Fallacy: Slippery Slope
- Type: Fallacy
- Explanation: This claims that one action (using stem cells) will inevitably lead to a drastic outcome (human cloning), without providing evidence for such a chain of events. It’s a classic slippery slope fallacy.
---
8. It gets a little uncomfortable in the sun on those 115-degree summer afternoon.
- Device/Fallacy: Rhetorical Device
- Type: Hyperbole / Exaggeration
- Explanation: The phrase “a little uncomfortable” is understated, but the temperature (115°F) is extreme. This is irony or understatement (litotes), possibly used for effect. It's not a logical fallacy but a rhetorical device to emphasize discomfort.
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9. Joan was scratched by a cat while visiting her friend and came down with a fever two days later. The cat's scratch therefore caused the fever.
- Device/Fallacy: Post Hoc Ergo Propter Hoc
- Type: Fallacy
- Explanation: This assumes that because one event followed another (scratch → fever), the first caused the second. But correlation does not imply causation. This is a post hoc fallacy.
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✔ Final Table:
| STATEMENT | DEVICE/FALLACY | TYPE |
|----------|----------------|------|
| "You cannot believe anything in this book because it's written by a Trump supporter." | Ad Hominem (Circumstantial) | Fallacy |
| Using 3rd person pronouns to give the appearance that information is more objective. | Rhetorical Device | Objective Tone / Impersonal Language |
| "Satanist Quarterly reports that 87% of Americans are atheists. Therefore there is no God." | Appeal to False Authority + Non Sequitur | Fallacy |
| In enforcing its patents so harshly, Monsanto Company acted as a feudal king demanding heavy taxes from his subjects. | Rhetorical Device | Metaphor / Analogy |
| The general trend in the data shows that most of the experiments were a success. | Rhetorical Device | Generalization (Neutral Summary) |
| There are three sides to every story: your story, my story and the truth that lies in the middle. | Rhetorical Device | Truism / Cliché |
| "Embryonic stem cells used for research will lead to full-scale reproductive human cloning." | Slippery Slope | Fallacy |
| It gets a little uncomfortable in the sun on those 115-degree summer afternoon. | Rhetorical Device | Hyperbole / Understatement |
| Joan was scratched by a cat... The cat's scratch therefore caused the fever. | Post Hoc Ergo Propter Hoc | Fallacy |
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📝 Notes:
- Rhetorical devices are tools used to persuade or style language. They’re not inherently flawed.
- Logical fallacies are errors in reasoning that weaken arguments.
- Some entries (like #3 and #6) could be debated, but the above classifications reflect standard logic and rhetoric.
Let me know if you'd like this formatted as a printable table!
Parent Tip: Review the logic above to help your child master the concept of logical fallacy worksheet.
