Conservation of mass is the focus of this Grade 6 Science worksheet, with students tracing atoms and using mass evidence to explain what happens during physical and chemical changes. The resource emphasizes closed systems, particle models, atom counts, and measurements before and after matter changes.

Build Evidence-Based Understanding

Students examine why atoms are conserved during changes and how particles can move, spread out, or rearrange without atoms being created or destroyed. They distinguish physical changes from chemical changes while applying the idea that the kinds and numbers of atoms remain constant in a closed system.

Mass data gives students another way to support the concept. They work with examples such as a sealed container with the same mass before and after a change, using measurements and atom counts as evidence for conservation of mass.

Practice the Science of Matter

The worksheet includes a reading passage followed by multiple-choice questions, true-or-false statements, short-answer questions, a labeled diagram, a categorization activity, and a short note. Students interpret particle models, determine expected mass in closed systems, identify evidence of conserved mass, and explain how atoms are rearranged during chemical changes.

Designed for Classroom Use

Use this Grade 6 matter and interactions resource for lesson practice, guided instruction, independent work, review, or assessment preparation. The combination of conceptual questions, numerical mass examples, particle-model reasoning, and written explanations gives students several ways to demonstrate their understanding of matter changes.

Student and Teacher Support

• Student Notes lines at the bottom of the worksheet provide space for recording key ideas.
• An Answer Key PDF includes a Teacher Guide with learning objectives, teaching tips, discussion questions, and common mistakes.

The resource is identified with the NGSS framework and centers on observable evidence: students compare mass measurements, count atoms in particle representations, and use those observations to explain why matter is conserved in a closed system.