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

9.33 Chemical Formulas and Molecular Models 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 9.33 Chemical Formulas and Molecular Models. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Chemical Formulas and Molecular Models: MCQ focus: interpret subscripts, coefficients, ball-and-stick models, and simple formula meanings without advanced mole calculations. 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-PS1-7, HS-PS1-2 - NGSS-aligned Chemical Formulas and Molecular Models: NGSS: HS-PS1-7; HS-PS1-2; NRC/DCI: PS1.B; SEP/CCC: Developing models / Scale, proportion, quantity; Common: HSN-Q.A; 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 9.33 Chemical Formulas and Molecular Models skill assessments:

Problem 1Difficulty: Mastery

The model shows 2NO2 -> N2O4, with two smaller molecules joining to form one larger molecule. Which conclusion is best supported?

ANitrogen atoms are destroyed when the larger molecule forms.

BThe atoms are conserved while the particles regroup into a larger molecule.

COxygen atoms turn into nitrogen atoms in the product.

DThe coefficient 2 changes NO2 into two different elements.

Solution & Explanation:The reactant side has two NO2 molecules, for 2 nitrogen atoms and 4 oxygen atoms. The product N2O4 has the same atom counts in one larger molecule.

Problem 2Difficulty: Mastery

A formula card shows Ca(OH)2. Which count is correct for one formula unit?

A1 Ca, 1 O, and 2 H

B1 Ca, 2 O, and 2 H

C1 Ca, 2 O, and 1 H

D2 Ca, 1 O, and 1 H

Solution & Explanation:The subscript 2 outside (OH) applies to both O and H, while Ca has no written subscript and counts as 1.

Problem 3Difficulty: Mastery

Which equation matches this model-based description: one nitrogen molecule and three hydrogen molecules form two ammonia molecules?

A2N2 + H2 -> NH3

BN2 + H2 -> 2NH3

CN + H3 -> NH3

DN2 + 3H2 -> 2NH3

Solution & Explanation:N2 supplies two nitrogen atoms, and 3H2 supplies six hydrogen atoms. Two NH3 molecules contain two nitrogen atoms and six hydrogen atoms.

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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 Physical Science with Earth and Science Science students. It aligns with educational standard NGSS HS-PS1-7, HS-PS1-2 (NGSS: HS-PS1-7; HS-PS1-2; NRC/DCI: PS1.B; SEP/CCC: Developing models / Scale, proportion, quantity; Common: HSN-Q.A; RST.9-10.7; State refs: CA/NYSSLS same HS-PS PE family; FL SC.912.P.8; TX IPC matter strand.).