Mississippi Science CHE.6.6
The Standard
- CHE.6
- Students will demonstrate an understanding of the types, causes, and effects of chemical reactions.
Use mathematics and computational analysis to support the concept of percent yield and limiting reagent.
2026 Mississippi College- and Career-Readiness Standards for Science · Chemical Reactions
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students use a balanced equation and starting amounts to find which reactant runs out first. They calculate the most product possible, then compare it with the amount actually made to find percent yield.
What Mastery Looks Like
- A student converts amounts to moles and uses the mole ratio to identify the limiting reactant. They calculate theoretical yield and percent yield, showing their steps and units.
Common Misconceptions
- Students often pick the reactant with the smaller starting mass without checking the mole ratio. They may divide theoretical yield by actual yield, or treat unused reactant as product lost.
How to Assess It
- Exit ticket: Given 2Mg + O2 → 2MgO, 4 mol Mg and 3 mol O2 produce 3 mol MgO. Identify the limiting reactant, calculate percent yield, and show your mole-ratio steps.
Lesson moves
Ways to Teach It
In a large cup, react 2 g baking soda with 20 mL 5% vinegar, measure mass loss, and calculate CO2 percent yield.
Ask students to explain why 3 mol O2 cannot all react with 4 mol Mg in 2Mg + O2 → 2MgO.
Enter three reactant-pair cases into a spreadsheet with mole-ratio formulas; compare predicted yields and flag the limiting reactant in each.
Give a cookie recipe: 2 eggs and 3 cups flour make 24 cookies; with 5 eggs, 9 cups flour, and 48 cookies made, calculate yield.
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Printable CHE.6.6 Worksheet
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Related Standards
- CHE.8.1
Use mathematical and computational analysis to quantitatively express the concentration of solutions using concepts such as molarity, percent by mass, and dilut...
- CHE.6.7
Plan and conduct a controlled scientific investigation to produce mathematical evidence to predict and confirm the limiting reagent and percent yield in the rea...
- CHE.8.7
Use mathematical and computational analysis to predict the results of reactions using the concentration of solutions (i.e., solution stoichiometry).
- CHE.4.6
Use mathematical and computational analysis to determine the empirical formula and the percent composition of compounds.
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