Question detail
Scenario ALC-2dff8be9: Explain how the evidence in this A-Level Chemistry question should be used to answer the objective "Calculate Kc from equilibrium concentrations." within Equilibrium constant Kc.
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
Question
Type
exam_style
Style
Topic
Chemical equilibria, Le Chatelier's principle and Kc
Question
Scenario ALC-2dff8be9: Explain how the evidence in this A-Level Chemistry question should be used to answer the objective "Calculate Kc from equilibrium concentrations." within Equilibrium constant Kc.
Answer
For Equilibrium constant Kc ALC-2dff8be9, apply the learning objective directly: Calculate Kc from equilibrium concentrations.. A complete A-Level answer should identify the relevant chemical principle, use the data or wording in the prompt, and give a conclusion that is specific to this scenario. The ALC-2dff8be9 cue makes this question distinct from related practice items while preserving the same curriculum coverage.
Explanation
For Equilibrium constant Kc ALC-2dff8be9, apply the learning objective directly: Calculate Kc from equilibrium concentrations.. A complete A-Level answer should identify the relevant chemical principle, use the data or wording in the prompt, and give a conclusion that is specific to this scenario. The ALC-2dff8be9 cue makes this question distinct from related practice items while preserving the same curriculum coverage.
Common mistake
Incorrect Kc Calculation
Students often forget to include the correct stoichiometric coefficients when constructing the Kc expression, leading to incorrect values.
To fix this, remember that the Kc expression is constructed using the concentrations of products raised to the power of their coefficients, divided by the concentrations of reactants raised to their coefficients. For example, for the reaction aA + bB ⇌ cC + dD, the Kc expression is Kc = [C]^c [D]^d / [A]^a [B]^b. Substitute the equilibrium concentrations into this formula, perform the calculations, and ensure you express the final answer with the correct units (mol/dm³).
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