Mississippi Science CHE.8.8
The Standard
- CHE.8
- Students will demonstrate an understanding of the nature of properties of various types of chemical solutions.
Enrichment: Investigate parts per million and/or parts per billion as it applies to environmental concerns in your geographic region, and reference laws that govern these factors.
2026 Mississippi College- and Career-Readiness Standards for Science · Solutions
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students read a local drinking water report and identify contaminant levels in parts per million or parts per billion. They convert units, compare a reported level with its legal limit, and identify the law behind that limit.
What Mastery Looks Like
- A student can convert 0.004 ppm to 4 ppb and compare it with the 10 ppb federal limit for arsenic in drinking water. They can name the Safe Drinking Water Act and explain that a level below the limit is not zero.
Common Misconceptions
- Students may treat 1 ppm and 1 ppb as equal, or reverse the conversion. They may confuse a measured level with the legal limit. Some assume that a level below the limit means no contaminant is present.
How to Assess It
- Exit ticket: A sample water report lists arsenic at 0.007 ppm. Convert the reading to ppb, compare it with the 10 ppb federal limit, and name the law behind that limit.
Lesson moves
Ways to Teach It
Dilute 1 mL colored water in 999 mL water three times, using each new mixture; label the original mixture's concentration in ppm and ppb.
Give pairs a local water report and ask: Does a reading below the legal limit mean the contaminant is absent?
Give teams cards labeled 0.005 ppm, 5 ppb, 0.5 ppm, and 500 ppb; have them race to match equivalent concentrations.
Find your water utility's latest report, choose one contaminant, and compare its reported concentration with the EPA limit under the Safe Drinking Water Act.
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Printable CHE.8.8 Worksheet
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