Free Printable WorksheetScienceGrade 11Science CurriculumNGSS SEPs/CCCs; CCSS RST.11-12.1-3, 7-9; WHST.11-12.2, 7-9; HSN-Q.A.1-3; HSS-ID; AP Chem Science Practices 1-6; ACS RAMP

11.9 Error, Uncertainty, and Validity of Evidence Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.9 Error, Uncertainty, and Validity of Evidence. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Error, Uncertainty, and Validity of Evidence: Evaluate random and systematic error, uncertainty, calibration limits, reproducibility, and whether evidence supports a claim. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks NGSS SEPs/CCCs; CCSS RST.11-12.1-3, 7-9; WHST.11-12.2, 7-9; HSN-Q.A.1-3; HSS-ID; AP Chem Science Practices 1-6; ACS RAMP - Error, Uncertainty, and Validity of Evidence Chemistry Standards Crosswalk: National: NGSS SEPs/CCCs; CCSS RST.11-12.1-3, 7-9; WHST.11-12.2, 7-9; HSN-Q.A.1-3; HSS-ID; AP Chem Science Practices 1-6; ACS RAMP. State frameworks: TX TEKS 112.43(c)(1)-(4); CA/NY/NJ NGSS practices; MA STE practices; FL, GA, and VA inquiry/lab-safety practices.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Chemistry

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 11.9 Error, Uncertainty, and Validity of Evidence skill assessments:

Problem 1Difficulty: Mastery

A claim says a buffer keeps pH constant. Initial pH is 7.20 ± 0.02. After adding acid, pH is 7.16 ± 0.02. After adding base, pH is 7.25 ± 0.02. What conclusion is most valid?

AThe buffer keeps pH exactly constant because all values round to 7.2.

BThe buffer fails completely because any change disproves buffering.

CThe acid and base data are invalid because uncertainty is reported.

DThe buffer limits pH change, but the data do not show pH is exactly constant under additions.

Solution & Explanation:The pH changes are small, supporting buffering, but the intervals do not all collapse to one exact value. Evidence supports limited change, not perfect constancy.

Problem 2Difficulty: Mastery

A student tests whether rinsing glassware reduces sodium contamination. The rinsed group has 0.08 ± 0.02 mg/L sodium; the unrinsed group has 0.13 ± 0.02 mg/L. A blank has 0.07 mg/L sodium. What is the best conclusion?

ARinsing definitely removes all sodium because 0.08 is lower than 0.13.

BThe blank is irrelevant because it is not a glassware sample.

CThe high blank suggests background contamination, so the rinsing effect should be interpreted only after blank correction or improved cleaning controls.

DThe unrinsed group must be invalid while the rinsed group is exact.

Solution & Explanation:The blank is nearly as high as the rinsed sample, indicating substantial background sodium. This threatens the validity of comparing glassware treatments without correction or better controls.

Problem 3Difficulty: Mastery

A validation report states that a method is accurate because the average of ten biased high readings and ten biased low readings equals the certified value. What is the main weakness?

AAn average can never be compared with a certified value.

BOpposite biases can cancel in the average while individual measurements remain invalid for unknown samples.

CTwenty readings are too many for validation.

DEqual high and low readings prove the instrument has no error.

Solution & Explanation:A correct overall average can hide structured error. Validation should examine bias patterns, individual residuals, and conditions, not only the grand mean.

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Frequently Asked Questions

Common questions about printing, using, and solving this worksheet

QHow do I download and print this 11.9 Error, Uncertainty, and Validity of Evidence worksheet?

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Chemistry Science students. It aligns with educational standard NGSS SEPs/CCCs; CCSS RST.11-12.1-3, 7-9; WHST.11-12.2, 7-9; HSN-Q.A.1-3; HSS-ID; AP Chem Science Practices 1-6; ACS RAMP (National: NGSS SEPs/CCCs; CCSS RST.11-12.1-3, 7-9; WHST.11-12.2, 7-9; HSN-Q.A.1-3; HSS-ID; AP Chem Science Practices 1-6; ACS RAMP. State frameworks: TX TEKS 112.43(c)(1)-(4); CA/NY/NJ NGSS practices; MA STE practices; FL, GA, and VA inquiry/lab-safety practices.).