Free Printable WorksheetScienceGrade 8Science Curriculum8.27

8.27 Law of Conservation of Mass in Closed Systems (Qualitative) Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 8 Science worksheet provides structured practice on 8.27 Law of Conservation of Mass in Closed Systems (Qualitative). Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Law of Conservation of Mass in Closed Systems (Qualitative) - Which use best models and data to show that mass is conserved in reactions in closed systems, accounting for gases produced or consumed? (NGSS MS‑PS1‑5 (qualitative); SEP: Analyzing Data; CCC: Energy/Matter; 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

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 8.27 Law of Conservation of Mass in Closed Systems (Qualitative) skill assessments:

Problem 1Difficulty: Mastery

Two students debate the results of a gas-producing reaction. One says, "The lower mass in the open cup proves matter was destroyed." The other says, "The sealed-flask data are better evidence because they include the gas." Which evaluation is best?

AThe first student is correct because any mass decrease proves matter was destroyed.

BThe second student is correct because the sealed-flask data include the gas, so they are better evidence for conservation of mass.

CBoth students are wrong because chemical reactions always change total mass.

DNeither setup can provide evidence about mass.

Solution & Explanation:The open cup is an open system, so gas can escape. The sealed flask provides stronger evidence because it includes all of the matter involved in the reaction.

Problem 2Difficulty: Mastery

A student heats steel wool in a jar with a sealed lid. The steel wool gains mass, but the total mass of the jar system does not change. Which conclusion is correct?

AThe steel wool created extra matter as it glowed.

BThe jar lost mass because oxygen was used up.

CHeat from the burning added permanent mass to the jar.

DOxygen inside the jar combined with the steel wool, so mass shifted from the gas to the solid while the total jar system stayed the same.

Solution & Explanation:The steel wool gained mass because oxygen from inside the jar became part of the solid product. The total jar system still conserved mass.

Problem 3Difficulty: Mastery

Dry ice is placed in an open cup and in a sealed bottle. Which outcome best supports conservation of mass?

AThe open cup keeps the same mass because dry ice disappears.

BThe sealed bottle should lose mass faster because pressure increases.

CThe open cup shows lower measured mass as gas escapes, while the sealed bottle keeps the same total mass because the gas remains inside.

DDry ice has no mass once it becomes gas.

Solution & Explanation:When dry ice turns into gas, the gas can leave an open cup but stays inside a sealed bottle. The sealed bottle better shows conservation of mass.

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Frequently Asked Questions

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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 8.27 (Learners compare open and closed systems, interpret particle models and graphs, and use evidence from experiments to explain why total mass stays constant.).