Free Printable WorksheetScienceGrade 8Science CurriculumSCI.8.18

8.18 Identify Substances by Characteristic Properties Worksheet

Download our free printable Grade 8 Science worksheet on 8.18 Identify Substances by Characteristic Properties. Ideal for classroom practice, homeschool learning, independent homework, and standardized test preparation. Available in both print-ready PDF and editable DOCX formats.

Choose your preferred download format:

100% Free • No registration or login required • Instant file access

Download PDF Download DOCX

Prefer interactive practice with instant grading and explanations?Practice Identify Substances by Characteristic Properties Online

Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 8 Science worksheet provides structured practice on 8.18 Identify Substances by Characteristic Properties. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Identify Substances by Characteristic Properties - Which analysis best density, melting/boiling point, solubility, and conductivity data to determine if samples are the same substance? (NGSS MS‑PS1‑2; DCI PS1.A; SEP: Analyzing and Interpreting Data; CCC: Patterns; CCSS Math 8.SP; TEKS §112.28 Grade 8; FL NGSSS; VA SOL; MA STE)

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

Grade 8

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 8.18 Identify Substances by Characteristic Properties skill assessments:

Problem 1Difficulty: Mastery

A teacher sets up an “unknown” challenge with deliberate measurement traps. Sample 1:,,Science - density 4.78 g/cm³,,Science - melts sharply at 223.8°C,,Science - boils at 632.7°C,,Science - solubility (25°C) 30 g/100 mL,,Science - conductivity (solid) conducts electricity,,Science Sample 2:,,Science - density 4.88 g/cm³,,Science - melts from 202.0°C to 234.2°C,,Science - boils near 620.9°C,,Science - solubility (25°C) 30 g/100 mL,,Science - conductivity (solid) conducts electricity,,Science "Which claim is most defensible?,A. Sample 2 must be purer because its melting range includes the melting point of Sample 1. | B. Sample 1 is more likely the pure substance; Sample 2 likely contains impurities because it melts over a range. | C. Both samples are pure because they have boiling points. | D. Purity cannot be evaluated using melting behavior.,B,A sharp melting point indicates a pure substance. Impurities usually broaden the melting point into a range and can slightly change density or solubility.,NO,,,,,online_practice_skill_page,practice,grade 8 science identifying substances by characteristic properties practice questions,identify substances by characteristic properties online practice | identify substances by characteristic properties review | SCI.8.18 practice | grade 8 science physical science: matter and its interactions questions,Identify Substances by Characteristic Properties Practice Questions for Grade 8 Science,Identify Substances by Characteristic Properties Practice Questions,Grade 8 Science Identify Substances by Characteristic Properties Online Practice | FreeK12Practice,Grade 8 science practice on identifying substances by characteristic properties. Review matter and interactions with online questions and explanations.,identify-substances-by-characteristic-properties-practice,/grade-8/science/physical-science-matter-and-its-interactions/sci-8-18/identify-substances-by-characteristic-properties-practice/,Grade 8 Science: Matter and Its Interactions,Physical versus Chemical Changes and Conservation | Factors Affecting Reaction Rates,sci-8-18,,/grade-8/science/ | /grade-8/science/physical-science-matter-and-its-interactions/ | /grade-8/science/physical-science-matter-and-its-interactions/sci-8-21/physical-versus-chemical-changes-and-conservation-practice/ | /grade-8/science/physical-science-matter-and-its-interactions/ps-8-22/factors-affecting-reaction-rates-practice/,/grade-8/,/grade-8/science/,/grade-8/science/physical-science-matter-and-its-interactions/,/grade-8/science/physical-science-matter-and-its-interactions/sci-8-18/,Home|/ > Grade 8|/grade-8/ > Science|/grade-8/science/ > Physical Science: Matter and Its Interactions|/grade-8/science/physical-science-matter-and-its-interactions/ > SCI.8.18|/grade-8/science/physical-science-matter-and-its-interactions/sci-8-18/ > Identify Substances by Characteristic Properties Practice|/grade-8/science/physical-science-matter-and-its-interactions/sci-8-18/identify-substances-by-characteristic-properties-practice/,BreadcrumbList|CollectionPage|FAQPage,index

Solution & Explanation:preview

Problem 2Difficulty: Mastery

Two liquids might be the same, but one contains dissolved impurities. Sample A (tested as a pure liquid at 25°C): - density 2.28 g/mL - boiling point 191.1°C - solubility in water (25°C) 0.1 g/100 mL - conductivity (pure liquid) does not conduct electricity Sample B (tested after dissolving in water at 25°C): - density 2.28 g/mL - boiling point 192.3°C - solubility in water (25°C) 0.1 g/100 mL - conductivity (aqueous solution) solution conducts strongly Which is the BEST conclusion/plan for deciding if A and B are the same substance?

AIgnore boiling point because it changes with sample size.

BDecide they are different because solution conductivity can never match pure-liquid conductivity.

CDecide they are the same because density alone proves identity.

DCompare conductivity in the same condition (both as pure liquid or both as aqueous solution) and use density and boiling point as the main identifiers.

Solution & Explanation:Conductivity depends on the condition (pure substance vs dissolved). To compare fairly, test the same phase/condition, then use characteristic properties like density and boiling point together.

Problem 3Difficulty: Mastery

A mystery substance is either a metal, an ionic compound, or a molecular compound; two samples are tested. Sample A (tested as a pure liquid at 25°C):,,Science - density 1.69 g/mL,,Science - boiling point 76.2°C,,Science - solubility in water (25°C) 5 g/100 mL,,Science - conductivity (pure liquid) conducts electricity,,Science Sample B (tested after dissolving in water at 25°C):,,Science - density 1.7 g/mL,,Science - boiling point 73.9°C,,Science - solubility in water (25°C) 5 g/100 mL,,Science - conductivity (aqueous solution) solution conducts strongly,,Science "Which is the BEST conclusion/plan for deciding if A and B are the same substance?,A. Decide they are the same because density alone proves identity. | B. Decide they are different because solution conductivity can never match pure-liquid conductivity. | C. Compare conductivity in the same condition (both as pure liquid or both as aqueous solution) and use density and boiling point as the main identifiers. | D. Ignore boiling point because it changes with sample size.,C,Conductivity depends on the condition (pure substance vs dissolved). To compare fairly

Solution & Explanation:follow; noindex

Want more practice questions with step-by-step guidance?

Practice All Questions Online

Frequently Asked Questions

Common questions about printing, using, and solving this worksheet

QHow do I download and print this 8.18 Identify Substances by Characteristic Properties worksheet?

Click either the "Download PDF" or "Download DOCX" button at the top of the page. You can print the PDF directly from your browser or edit the DOCX file in Microsoft Word or Google Docs to tailor the questions to your students.

QIs this 8.18 Identify Substances by Characteristic Properties worksheet free for teachers and homeschoolers?

Yes! All learning materials, worksheets, and practice resources on Free K12 Practice are 100% free for teachers, students, parents, tutors, and homeschooling families for non-commercial educational use. No account or subscription is required.

QCan students practice 8.18 Identify Substances by Characteristic Properties online with instant feedback?

Yes! In addition to this printable worksheet, students can practice 8.18 Identify Substances by Characteristic Properties interactively on our platform with automated grading, instant score tracking, and detailed step-by-step solutions.

QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 8 Science students. It aligns with educational standard SCI.8.18 (Use characteristic properties to identify unknown substances and compare materials.).