Mississippi Science CHE.4.8
The Standard
- CHE.4
- Students will demonstrate an understanding of the types of bonds and resulting atomic structures for the classification of chemical compounds.
Plan and conduct controlled scientific investigations to produce mathematical evidence of the empirical composition of a compound.
2026 Mississippi College- and Career-Readiness Standards for Science · Bonding
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students plan a test that measures a reactant and its product while keeping the heating and weighing steps consistent. They use the mass change to find each element's mass, convert the masses to moles, and write the simplest whole-number formula.
What Mastery Looks Like
- A student records the mass of magnesium before heating and the mass of its oxide after heating. They find the oxygen gained, calculate a mole ratio near 1:1, and use it to justify MgO.
Common Misconceptions
- Students may use the full product mass as the oxygen mass instead of subtracting the starting magnesium mass. They may compare grams directly instead of converting to moles. Spilled product can make an incorrect result look like a different formula.
How to Assess It
- Exit ticket: A student heats 0.24 g of magnesium and gets 0.40 g of oxide. Find the oxygen mass, show the mole ratio, write the formula, and name one step that would make a repeat trial reliable.
Lesson moves
Ways to Teach It
In goggles, weigh magnesium in a covered crucible, heat with the lid ajar, then cool and reweigh until the mass stays constant.
Ask students to explain why two groups starting with the same magnesium mass might record different product masses.
Give pairs mass-data cards and have them race to calculate each oxygen-to-magnesium mole ratio and sort the cards by formula.
Hand out a paint pigment data card listing 70% iron and 30% oxygen, then ask students to calculate the oxide formula.
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Printable CHE.4.8 Worksheet
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- CHE.4.6
Use mathematical and computational analysis to determine the empirical formula and the percent composition of compounds.
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