Mississippi Science CHE.11.3
The Standard
- CHE.11
- Enrichment: Students will understand that chemical equilibrium is a dynamic process at the molecular level.
Enrichment: Use mathematical and computational thinking to calculate an equilibrium constant expression for a reaction.
2026 Mississippi College- and Career-Readiness Standards for Science · Equilibrium (Enrichment)
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students write a ratio of product and reactant concentrations for a balanced reaction. They use coefficients as exponents and equilibrium concentrations to calculate K. They leave pure solids and liquids out of the ratio.
What Mastery Looks Like
- Given N2O4 ⇌ 2NO2, they write K = [NO2]^2/[N2O4]. With equilibrium concentrations of 0.30 M NO2 and 0.20 M N2O4, they calculate K = 0.45.
Common Misconceptions
- Students may multiply by a coefficient instead of using it as an exponent. They may use starting concentrations instead of equilibrium concentrations. Some include solids in the expression or put reactants on top.
How to Assess It
- Exit ticket: For N2O4 ⇌ 2NO2, the equilibrium concentrations are 0.20 M N2O4 and 0.30 M NO2. Write the K expression and calculate K.
Lesson moves
Ways to Teach It
Give pairs one N2O4 card, two NO2 cards, and concentration slips; have them build the K fraction and calculate its value.
Ask, 'Why is the NO2 concentration squared for N2O4 ⇌ 2NO2?' Have students write one sentence, then compare answers.
Race pairs to calculate K for 2SO2 + O2 ⇌ 2SO3 using equilibrium concentrations of 0.20 M, 0.10 M, and 0.40 M, respectively.
Show the fertilizer reaction N2 + 3H2 ⇌ 2NH3; have students write its K expression and identify which concentration is cubed.
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Printable CHE.11.3 Worksheet
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