Mississippi Science CHE.11.1
The Standard
- CHE.11
- Enrichment: Students will understand that chemical equilibrium is a dynamic process at the molecular level.
Enrichment: Construct explanations to explain how to use Le Chatelier’s principle to predict the effect of changes in concentration, temperature, and pressure. CHE.11.2 Enrichment: Predict when equilibrium is established in a chemical 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 use a balanced reaction to predict which way it shifts when concentration, temperature, or pressure changes. They count gas molecules when pressure changes and treat heat as a reactant or product. They recognize equilibrium when the forward and reverse reactions happen at the same rate.
What Mastery Looks Like
- Given N₂ + 3H₂ ⇌ 2NH₃ + heat, a student predicts that adding H₂ or compressing the gases favors NH₃, while heating favors N₂ and H₂. They explain that a new equilibrium is reached when both reaction rates match and concentrations stay steady.
Common Misconceptions
- Students may think equilibrium means the reaction stops or that reactants and products have equal amounts. Some predict that adding a reactant shifts the reaction toward reactants. Others assume compressing any gas mixture causes a shift, even when both sides have the same number of gas molecules.
How to Assess It
- Give students N₂ + 3H₂ ⇌ 2NH₃ + heat. Ask them to predict the effect of adding H₂, heating, and compressing the gases, then state how they would know equilibrium has been reached again.
Lesson moves
Ways to Teach It
Use red and blue paper circles to build H₂, I₂, and HI; add an H₂ pair and rebuild molecules to show the shift.
Ask students to explain in three sentences why heating N₂ + 3H₂ ⇌ 2NH₃ + heat reduces ammonia yield.
Deal reaction and change cards; students place a left, right, or no-shift card beside each pair and defend their choice.
Show a fertilizer plant diagram for ammonia production; ask students to predict what raising the pressure does to ammonia yield.
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Printable CHE.11.1 Worksheet
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Related Standards
- CHE.11
Enrichment: Students will understand that chemical equilibrium is a dynamic process at the molecular level.
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Enrichment: Use mathematical and computational thinking to calculate an equilibrium constant expression for a reaction.
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