Question detail
Which of the following best describes an enthalpy cycle?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Energetics
Question
- A. A graphical representation of temperature changes during a reaction
- B. A diagram showing the relationship between pressure and volume
- C. A pathway diagram illustrating enthalpy changes for a reaction
- D. A chart displaying the concentration of reactants over time
Answer
A pathway diagram illustrating enthalpy changes for a reaction
Explanation
An enthalpy cycle is a pathway diagram that illustrates the enthalpy changes associated with a chemical reaction. It visually represents how the enthalpy of the system changes as reactants are converted to products, allowing for the application of Hess's law to calculate overall enthalpy changes. This understanding is crucial for thermodynamic calculations.
Common mistake
Misunderstanding Enthalpy Cycles
Students often confuse the direction of arrows in enthalpy cycles, leading to incorrect interpretations of energy changes.
To fix this, students should practice drawing enthalpy cycles, ensuring they correctly represent exothermic and endothermic processes with appropriate arrow directions.
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