Question detail
Scenario ALC-9d089088: Which answer best applies Kp and partial pressure (A-level only) to the objective "Calculate Kp and determine appropriate units."?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Equilibrium constant Kp for homogeneous systems (A-level only)
Question
- A. The evidence must be applied specifically to Kp and partial pressure (A-level only) using the ALC-9d089088 context.
- B. A generic recall statement that does not use the ALC-9d089088 context.
- C. A distractor that swaps Kp and partial pressure (A-level only) with a different A-Level Chemistry topic.
- D. A distractor that gives a conclusion without evidence for ALC-9d089088.
Answer
The evidence must be applied specifically to Kp and partial pressure (A-level only) using the ALC-9d089088 context.
Explanation
The correct option is The evidence must be applied specifically to Kp and partial pressure (A-level only) using the ALC-9d089088 context. It is unique to ALC-9d089088, names Kp and partial pressure (A-level only), and links the answer to Calculate Kp and determine appropriate units.. Other options are weaker because they are generic, swap the topic, or make an unsupported conclusion.
Common mistake
Misidentifying the Units of Kp
Students often write the equilibrium constant Kp as a dimensionless quantity, ignoring that it is expressed in terms of pressure units such as atm or bar.
Kp must be expressed with the same pressure units as the partial pressures used in the equilibrium expression, e.g. atm, bar, or kPa. When all partial pressures are in atm, Kp is given in atm⁰⁰ (dimensionless), but the convention is to state the units explicitly as atm or bar to avoid confusion. Keep the correction anchored to Kp and partial pressure (A-level only) and the objective: Calculate Kp and determine appropriate units.
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