Free Printable WorksheetScienceGrade 8Science CurriculumSCI.8.21

8.21 Physical versus Chemical Changes and Conservation Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 8 Science worksheet provides structured practice on 8.21 Physical versus Chemical Changes and Conservation. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Physical versus Chemical Changes and Conservation - Which use best evidence such as gas formation, color change, precipitate, and temperature change to identify reactions and explain that atoms rearrange while the total number of each type is conserved (qualitative)? (NGSS MS‑PS1‑2, MS‑PS1‑5; DCI PS1.B; SEP: Constructing Explanations; CCC: Energy/Matter; CCSS RST.6–8.1; TEKS §112.28 Grade 8; FL NGSSS; VA SOL; MA STE)

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

Grade 8

Subject

Science

Domain

Science Curriculum

Formats

PDF & DOCX

Sample Practice Problems

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Below are sample questions representative of the exercises included on this worksheet and related 8.21 Physical versus Chemical Changes and Conservation skill assessments:

Problem 1Difficulty: Mastery

Which statement best uses conservation to evaluate this claim?

AGas cannot be made in a sealed container.

BAny gas inside a container must have entered from outside.

CThe gas can be produced from the reactants inside by rearranging atoms; unchanged mass supports that all matter stayed in the sealed container.

DUnchanged mass proves atoms were destroyed.

Solution & Explanation:Gas products can form from reactant atoms already present. In a closed system, matter doesn’t enter or leave, so gas production must come from rearrangement of internal atoms.

Problem 2Difficulty: Mastery

Which response is best?,A. The student is correct because mass depends only on temperature. | B. The student is correct because atoms can appear if energy is present. | C. The student is incorrect because mass can never be measured. | D. Mass conservation comes from atom conservation; if atoms were created or destroyed in ordinary chemistry

Solution & Explanation:and that leads to conservation of mass in a closed system. Creating/destroying atoms would require nuclear processes

Problem 3Difficulty: Mastery

Which statement best corrects this misunderstanding?

ACooling means no reaction happened because reactions always warm up.

BCooling proves atoms were destroyed.

CCooling can mean the reaction is endothermic (absorbs energy) while still producing products; it does not by itself mean the reaction stopped.

DCooling proves the gas is not a product.

Solution & Explanation:Temperature decrease can be evidence of an endothermic chemical reaction. You need other information (like reactant amounts or completion tests) to know whether it stopped early.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 8 Science students. It aligns with educational standard SCI.8.21 (Differentiate physical and chemical changes and apply conservation ideas to matter.).