Free Printable WorksheetScienceGrade 9Science CurriculumNGSS HS-PS1-1, HS-PS1-7

9.15 Elements, Compounds, and Chemical Symbols 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 9.15 Elements, Compounds, and Chemical Symbols. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Elements, Compounds, and Chemical Symbols: MCQ focus: match symbols, formulas, and particle models to elements or compounds and interpret subscripts at an introductory level. 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-PS1-1, HS-PS1-7 - NGSS-aligned Elements, Compounds, and Chemical Symbols: NGSS: HS-PS1-1; HS-PS1-7; NRC/DCI: PS1.A; PS1.B; SEP/CCC: Models / Patterns; Common: RST.9-10.4; 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 9.15 Elements, Compounds, and Chemical Symbols skill assessments:

Problem 1Difficulty: Mastery

Which option correctly classifies each formula: N2, CO, CaO, and Ar?

AN2 is an element; CO and CaO are compounds; Ar is an element.

BN2, CO, CaO, and Ar are all compounds.

CN2 and CO are elements; CaO and Ar are compounds.

DN2, CO, CaO, and Ar are all elements.

Solution & Explanation:N2 and Ar contain only one element type, so they are elements. CO contains carbon and oxygen, and CaO contains calcium and oxygen, so they are compounds.

Problem 2Difficulty: Mastery

A formula card is shown. If the card represents the sample amount shown, how many oxygen atoms are represented total?

A6 oxygen atoms

B4 oxygen atoms

C2 oxygen atoms

D1 oxygen atom

Solution & Explanation:The coefficient 2 means two CO2 molecules. Each CO2 molecule has two oxygen atoms, so the total number of oxygen atoms is 2 times 2, or 4.

Problem 3Difficulty: Mastery

Use the particle diagram shown. Which statement correctly compares the two carbon-oxygen compounds?

ACO2 has fewer oxygen atoms per carbon atom than CO.

BThey are the same compound because both contain carbon and oxygen.

CThey are different compounds because CO has a 1:1 ratio and CO2 has a 1:2 ratio.

DCO is an element, while CO2 is a compound.

Solution & Explanation:Both formulas contain carbon and oxygen, but their atom ratios differ. CO has one O for each C, while CO2 has two O atoms for each C.

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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-PS1-1, HS-PS1-7 (NGSS: HS-PS1-1; HS-PS1-7; NRC/DCI: PS1.A; PS1.B; SEP/CCC: Models / Patterns; Common: RST.9-10.4; State refs: CA/NYSSLS same HS-PS PE family; FL SC.912.P.8; TX IPC matter strand.).