Free Printable WorksheetScienceGrade 11Science CurriculumNGSS HS-PS1-2, HS-PS1-7; AP Chem Unit 4; Pre-AP Unit 4; CCSS HSN-Q.A.1-3, MP2, MP6

11.74 Particle Level Reaction Models Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Chemistry Science worksheet provides structured practice on 11.74 Particle Level Reaction Models. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Particle-Level Reaction Models: Use particle diagrams to show conservation of atoms, limiting reactants, products formed, and species remaining after reaction. Aligned to NGSS, CCSS, AP Chemistry/Pre-AP Chemistry, and representative state chemistry framework crosswalks NGSS HS-PS1-2, HS-PS1-7; AP Chem Unit 4; Pre-AP Unit 4; CCSS HSN-Q.A.1-3, MP2, MP6 - Particle-Level Reaction Models Chemistry Standards Crosswalk: National: NGSS HS-PS1-2, HS-PS1-7; AP Chem Unit 4; Pre-AP Unit 4; CCSS HSN-Q.A.1-3, MP2, MP6. State frameworks: TX TEKS 112.43(c)(9), (11), (12); FL SC.912.P.8.7-8.10; MA HS-PS1-9(MA), HS-PS1-10(MA); CA/NY/NJ HS-PS1-7; GA/VA reaction and stoichiometry standards.

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 11.74 Particle Level Reaction Models skill assessments:

Problem 1Difficulty: Mastery

For 2C2H2 + 5O2 -> 4CO2 + 2H2O, a particle model begins with 4 C2H2 molecules and 10 O2 molecules. Which explanation best connects the diagram to conservation of atoms?

AThe product count must equal 14 because there are 14 reactant molecules.

BO2 is excess because oxygen has the larger coefficient in the equation.

CThe model cannot be checked because molecules change during reaction.

DThe starting particles are exactly two balanced sets, so they form 8 CO2 and 4 H2O with no leftovers.

Solution & Explanation:The starting mixture doubles every coefficient in the balanced equation. All carbon, hydrogen, and oxygen atoms are conserved in 8 CO2 and 4 H2O.

Problem 2Difficulty: Mastery

A generic reaction has the particle ratio 2A + B -> 2C. If the before model has 10 A particles and 7 B particles, what should the complete after model show?

A14 C particles and no leftovers

B10 C particles and 2 A particles

C10 C particles and 2 B particles

D5 C particles and 5 B particles

Solution & Explanation:Ten A particles can support five complete reaction events, using five B particles and forming ten C particles. Two B particles remain excess.

Problem 3Difficulty: Mastery

For 2Fe + 3Cl2 -> 2FeCl3, a particle model begins with 5 Fe atoms and 8 Cl2 molecules. What is the maximum complete after model?

A5 FeCl3 formula units and 0.5 Cl2 molecule

B4 FeCl3 formula units, 1 Fe atom, and 2 Cl2 molecules

C4 FeCl3 formula units and 1 Cl2 molecule

D8 FeCl3 formula units and no leftovers

Solution & Explanation:Only two complete balanced sets can form: they use 4 Fe atoms and 6 Cl2 molecules to make 4 FeCl3. One Fe and two Cl2 remain.

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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 HS-PS1-2, HS-PS1-7; AP Chem Unit 4; Pre-AP Unit 4; CCSS HSN-Q.A.1-3, MP2, MP6 (National: NGSS HS-PS1-2, HS-PS1-7; AP Chem Unit 4; Pre-AP Unit 4; CCSS HSN-Q.A.1-3, MP2, MP6. State frameworks: TX TEKS 112.43(c)(9), (11), (12); FL SC.912.P.8.7-8.10; MA HS-PS1-9(MA), HS-PS1-10(MA); CA/NY/NJ HS-PS1-7; GA/VA reaction and stoichiometry standards.).