Free Printable WorksheetScienceGrade 9Science CurriculumNGSS HS-PS1-2, HS-PS1-7

9.34 Reactants, Products, and Conservation of Atoms Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Physical Science with Earth and Science Science worksheet provides structured practice on 9.34 Reactants, Products, and Conservation of Atoms. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Reactants, Products, and Conservation of Atoms: MCQ focus: identify reactants and products and explain how atoms are rearranged but not created or destroyed in reactions. Aligned to NGSS high school Physical Science, Earth and Space Science, and Engineering Design; NRC/DCI; SEP/CCC; CCSS math/literacy connections; selected CA NGSS, NYSSLS, Florida CPALMS, and Texas TEKS references NGSS HS-PS1-2, HS-PS1-7 - NGSS-aligned Reactants, Products, and Conservation of Atoms: NGSS: HS-PS1-2; HS-PS1-7; NRC/DCI: PS1.B; SEP/CCC: Constructing explanations / Energy and matter; Common: RST.9-10.7; State refs: CA/NYSSLS same HS-PS PE family; FL SC.912.P.8; TX IPC matter strand.

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

Physical Science with Earth and Science

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 9.34 Reactants, Products, and Conservation of Atoms skill assessments:

Problem 1Difficulty: Mastery

Which summary best connects reactants, products, and conservation of atoms?

AReactants and products must be the same substances if atoms are conserved.

BReactants are formed after the arrow, products are used up, and atoms may vanish.

CReactants are starting substances, products are formed substances, and balanced reactions show atoms rearranged without being created or destroyed.

DProducts are new atoms, while reactants are old atoms.

Solution & Explanation:This summary correctly identifies reactants and products and explains conservation: atoms are rearranged into new substances but not created or destroyed.

Problem 2Difficulty: Mastery

Use the reaction diagram to answer the question. The model starts with 3 Fe atoms and 2 S atoms and ends with 2 FeS units plus 1 Fe atom left over. Which explanation is best?

AAll atoms are accounted for; two Fe atoms reacted with two S atoms and one Fe atom remained unreacted.

BFeS contains atoms that were not shown in the reactants.

COne sulfur atom was destroyed during the reaction.

DThe leftover iron atom means products are not conserved.

Solution & Explanation:The after side contains 3 Fe atoms total and 2 S atoms total, the same as the before side. One Fe atom remains unreacted.

Problem 3Difficulty: Mastery

In 2C2H2 + 5O2 -> 4CO2 + 2H2O, what do the products contain?

Athe same 4 C atoms, 4 H atoms, and 10 O atoms as the reactants

B2 C atoms, 4 H atoms, and 5 O atoms

Cnew carbon atoms made during combustion

D4 C atoms, 2 H atoms, and 10 O atoms

Solution & Explanation:Counting with coefficients shows both sides contain 4 carbon atoms, 4 hydrogen atoms, and 10 oxygen atoms.

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Physical Science with Earth and Science Science students. It aligns with educational standard NGSS HS-PS1-2, HS-PS1-7 (NGSS: HS-PS1-2; HS-PS1-7; NRC/DCI: PS1.B; SEP/CCC: Constructing explanations / Energy and matter; Common: RST.9-10.7; State refs: CA/NYSSLS same HS-PS PE family; FL SC.912.P.8; TX IPC matter strand.).