Mississippi Science CHE.4.7
The Standard
- CHE.4
- Students will demonstrate an understanding of the types of bonds and resulting atomic structures for the classification of chemical compounds.
Use scientific investigation to determine the percentage of composition for a substance (e.g., sugar in gum, water and/or unpopped kernels in popcorn, percent water in a hydrate). Compare results to justify conclusions based on experimental evidence.
2026 Mississippi College- and Career-Readiness Standards for Science · Bonding
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students measure or count a part and the whole, then calculate the part as a percentage. They test two samples the same way and use their results to explain a difference.
What Mastery Looks Like
- A student can calculate the percent of unpopped kernels in two batches and say which batch popped more completely. They support the claim with numbers and identify a possible counting error.
Common Misconceptions
- Some students divide the whole by the part or mix kernel counts with masses in one calculation. Others assume all mass lost from chewed gum was sugar, though flavorings and moisture can leave too.
How to Assess It
- Exit ticket: Batch A had 6 unpopped kernels out of 30. Batch B had 3 out of 30. Calculate each percentage and explain which batch popped more completely.
Lesson moves
Ways to Teach It
Pop two labeled batches of 30 kernels in a microwave popcorn popper, then count unpopped kernels and compare percentages.
Ask: One batch left 4 of 20 kernels unpopped; another left 6 of 60. Which popped more completely? Defend your answer.
Give pairs part-and-whole mass cards and percentage cards; have them match each pair and check with a calculation.
Use sugar grams and serving mass from two cereal boxes to calculate and compare percent sugar by mass.
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Printable CHE.4.7 Worksheet
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Related Standards
- CHE.4.8
Plan and conduct controlled scientific investigations to produce mathematical evidence of the empirical composition of a compound.
- 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...
- PHS.1.3
Conduct an investigation to determine the identity of unknown substances by comparing properties to known substances.
- CHE.4.6
Use mathematical and computational analysis to determine the empirical formula and the percent composition of compounds.
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