Chemistry Year 12 - Module 5 - Lesson 12
Reaction Quotient Q — Predicting Direction of Shift
1. Key Ideas
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- The definition of reaction quotient Q and how it differs from Keq
- Why Q is a snapshot of current concentrations while Keq describes the equilibrium destination
2. Success Criteria
By the end, you should be able to:
- The definition of reaction quotient Q and how it differs from Keq
- The Q vs Keq decision rule: Q > Keq shifts left, Q < Keq shifts right, Q = Keq means no net change
- How to calculate Q using the same algebraic expression as Keq but with current concentrations
3. Key Terms
4. Activity: Build the Lesson Map
Use the lesson to complete the table. Keep answers brief but specific.
| Prompt | Your answer |
|---|---|
| Main concept | |
| Important example | |
| Common mistake to avoid | |
| How this links to the next lesson |
5. Short Answer Questions
1. Explain this lesson goal in your own words: "The definition of reaction quotient Q and how it differs from Keq". Use one specific example from the lesson.
2. Apply this idea to a new example: "The Q vs Keq decision rule: Q > Keq shifts left, Q < Keq shifts right, Q = Keq means no net change". Show your reasoning clearly.
3. Analyse why this idea matters for understanding Reaction Quotient Q — Predicting Direction of Shift: "How to calculate Q using the same algebraic expression as Keq but with current concentrations".
6. Extend: Apply the Idea
A student gives a memorised answer about Reaction Quotient Q — Predicting Direction of Shift but does not use evidence or reasoning.
Improve the answer by writing a stronger response that uses accurate terminology, a relevant example and a clear explanation.
7. Multiple Choice
1. What is the best first step when answering a question about Reaction Quotient Q — Predicting Direction of Shift?
A. Identify the key concept being tested
B. Write every fact from memory
C. Ignore the command word
D. Skip examples and evidence
2. Which answer would show stronger understanding of Reaction Quotient Q — Predicting Direction of Shift?
A. An answer with accurate terms and reasoning
B. A copied definition only
C. A single-word response
D. An answer with no example
3. What should you do if a question asks you to explain?
A. Link the idea to a reason or cause
B. List unrelated facts
C. Only draw a diagram
D. Write the shortest possible answer
8. Success Criteria Proof
Finish with evidence that you can do each success criterion.