100+ Free CMAS Science Grade 11 Practice Questions

Prepare for the Colorado Measures of Academic Success (CMAS) Science — Grade 11 exam with instant access — no signup required.

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Key Facts: CMAS Science Grade 11 Exam

Grade 11

CMAS Science tested grade (CDE)

ed.cde.state.co.us/assessment/cmas

Free

No student exam fee for standard school administration

CDE Assessment FAQs

Pearson

CDE assessment contractor; TestNav / PearsonAccessnext delivery

Spring 2026 CMAS Overview

Spring

Primary administration window (2026: April 6–24 for CMAS)

CDE Fact Sheets and FAQs

CAS

Aligned to Colorado Academic Standards grade-level expectations

CDE CMAS overview

650–850

Overall scale score range reported on CMAS score reports

CDE interpretive guides

5/8/11

Science tested grades statewide

CDE CMAS overview

SEP

Science and Engineering Practices integrated across large share of points

CMAS Science frameworks

CMAS Science Grade 11 is Colorado's free statewide spring summative (CDE/Pearson), mixed item types on TestNav, performance levels on a 650–850 scale; practice here is English MCQ study only.

Sample CMAS Science Grade 11 Practice Questions

Try these sample questions to test your CMAS Science Grade 11 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1An atom of potassium-39 has an atomic number of 19. How many neutrons are in its nucleus?

A.19 neutrons

B.20 neutrons

C.39 neutrons

D.58 neutrons

Explanation: Mass number equals protons plus neutrons. Neutrons = 39 − 19 = 20. Atomic number (19) is the proton count; isotopes of potassium differ only in neutron number.

2Which change would convert a fluorine atom into a different element?

A.Adding one neutron to the nucleus

B.Changing the number of protons in the nucleus

C.Exciting an electron to a higher energy level

D.Removing one electron to form a fluoride ion

Explanation: Elemental identity is defined by proton number (atomic number). Changing protons produces a new element; changing neutrons or electrons does not.

3Which subatomic particle has no charge and is found in the nucleus?

A.Proton

B.Electron

C.Neutron

D.Photon

Explanation: Neutrons are electrically neutral particles located in the nucleus with protons. Protons are positive, electrons are negative and outside the nucleus, and photons are packets of light energy.

4Moving left to right across a period on the periodic table, atomic radius generally decreases. What best explains this trend?

A.Atoms gain more principal shells, so radius increases

B.Nuclear charge increases while electrons occupy the same principal shell, pulling the cloud closer

C.Atoms lose protons, so attraction to electrons weakens

D.Ionization energy always decreases, so electrons spread farther out

Explanation: Across a period, electrons fill the same principal energy level while nuclear charge rises. Greater effective nuclear attraction pulls the electron cloud inward, decreasing atomic radius.

5A sealed flask contains a sample of gas. Which observation best supports the particle model that gas particles are far apart and move freely?

A.The gas has a fixed shape independent of the container

B.The gas completely fills the flask and can be compressed noticeably

C.The gas cannot be compressed under any pressure

D.The gas always freezes at room temperature

Explanation: Gases expand to fill available volume and are highly compressible because particles are widely spaced with weak interactions. Liquids and solids are much less compressible and do not fill a container the same way.

6In a closed system, the total mass of products after a chemical reaction equals the total mass of reactants. Which principle does this support?

A.Conservation of charge only

B.Law of conservation of mass

C.Electrons have zero mass in chemical systems

D.Energy cannot change form during reactions

Explanation: The law of conservation of mass states that matter is neither created nor destroyed in ordinary chemical reactions, so reactant mass equals product mass in a closed system.

7Two isotopes of the same element always have the same number of which particles?

A.Neutrons only

B.Protons only

C.Neutrons and electrons only, never protons

D.Mass number particles only

Explanation: Isotopes of an element share the same proton number (atomic number) and thus the same chemical identity. They differ in neutron count and therefore mass number.

8Which statement correctly compares solids, liquids, and gases at the particle level?

A.Solid particles vibrate in fixed positions; liquid particles can slide past each other; gas particles move independently and fill the container

B.Gas particles are locked in a rigid lattice while solids flow freely

C.Liquids always have greater particle spacing than gases

D.All three states have identical average particle spacing and motion

Explanation: In solids, particles vibrate about fixed lattice positions. In liquids, particles are close but mobile. In gases, particles are widely spaced and move freely, filling available volume.

9A student measures that 12.0 g of carbon react with 32.0 g of oxygen to form carbon dioxide, with no leftover reactants. What mass of CO₂ should form if mass is conserved?

A.20.0 g

B.32.0 g

C.44.0 g

D.12.0 g

Explanation: Conservation of mass requires product mass = reactant mass: 12.0 g + 32.0 g = 44.0 g of CO₂ in a closed system with complete reaction and no other products.

10Which statement best describes an ion?

A.An atom that has gained or lost electrons and therefore has a net charge

B.An atom that has changed its number of protons only

C.A molecule with no electrons

D.A neutron that has gained mass

Explanation: Ions form when atoms gain or lose electrons, producing a net positive (cation) or negative (anion) charge. Proton number still defines the element.

About the CMAS Science Grade 11 Exam

Colorado Measures of Academic Success (CMAS) Science — Grade 11 is Colorado's grade-level Colorado Measures of Academic Success (CMAS) statewide summative assessment, developed by CDE with Colorado educators and Pearson against the Colorado Academic Standards. It is administered in the spring window (for 2026: April 6–24 per CDE FAQs) on Pearson TestNav. Official forms use mixed item types (selected-response, technology-enhanced, and for many content areas constructed-response tasks). OpenExamPrep free practice is an English-language four-option MCQ study adaptation aligned to CMAS reporting categories and grade-level CAS—not official secure items, not a full TE/CR simulation, and not a substitute for classroom instruction or the official assessment.

Assessment

Question count not published by the exam provider

Time Limit

About 1 hour 40 minutes total across two units (CDE 2025–26 time table lists Grade 11 Science as 1h 40m; Spring 2026 Procedures Manual: two units of 50 minutes each).

Passing Score

CMAS Science and Social Studies overall scale scores range from 650 to 850 and are reported in four performance levels: Partially Met Expectations, Approached Expectations, Met Expectations, and Exceeded Expectations. Met Expectations and Exceeded Expectations indicate grade-level expectations have been met or exceeded (CDE CMAS interpretive guides; social studies cut scores adopted for 2026 reporting after the 2025 CAS-aligned first administration).

Exam Fee

Free for Colorado public school students; CMAS is a state-required summative assessment administered by districts at no cost to families (CDE Assessment FAQs). (Colorado Department of Education (CDE) with assessment contractor Pearson; delivery via PearsonAccessnext / TestNav)

CMAS Science Grade 11 Exam Content Outline

~36% of score points (18 of ~50 on the full blueprint)

Physical Science

High school CAS physical science: atomic structure and bonding, chemical reactions and conservation of matter, forces and motion, energy transfer and conservation, and waves.

~32% of score points (16 of ~50)

Life Science

High school CAS life science: cell structure and function, matter and energy in organisms and ecosystems, inheritance and variation, and biological evolution.

~31–32% of score points (16 of ~50)

Earth and Space Science

High school CAS earth and space science: Earth's place in the universe, Earth's interacting systems, and Earth and human activity including climate and resources.

~65–74% of score points involve SEPs (integrated, not a separate reporting category)

Science and Engineering Practices

Every item integrates at least two of the three CAS dimensions around a grounding phenomenon, so SEPs are embedded across all three content categories rather than reported separately.

How to Pass the CMAS Science Grade 11 Exam

What You Need to Know

Passing score: CMAS Science and Social Studies overall scale scores range from 650 to 850 and are reported in four performance levels: Partially Met Expectations, Approached Expectations, Met Expectations, and Exceeded Expectations. Met Expectations and Exceeded Expectations indicate grade-level expectations have been met or exceeded (CDE CMAS interpretive guides; social studies cut scores adopted for 2026 reporting after the 2025 CAS-aligned first administration).
Assessment: Question count not published by the exam provider
Time limit: About 1 hour 40 minutes total across two units (CDE 2025–26 time table lists Grade 11 Science as 1h 40m; Spring 2026 Procedures Manual: two units of 50 minutes each).
Exam fee: Free for Colorado public school students; CMAS is a state-required summative assessment administered by districts at no cost to families (CDE Assessment FAQs).

Keys to Passing

Complete 500+ practice questions
Score 80%+ consistently before scheduling
Focus on highest-weighted sections
Use our AI tutor for tough concepts

CMAS Science Grade 11 Study Tips from Top Performers

1Use CDE-sanctioned Colorado Practice Resources (coassessments.com) so students learn TestNav tools and item interactions.

2Align review to grade-level Colorado Academic Standards and CMAS frameworks/evidence statements, not only generic worksheets.

3Review wrong answers by reporting category (for example reading subclaim or math major content) to target instruction.

4Use short, frequent practice sessions across the year rather than cramming only in the April window.

5For constructed-response skills, practice evidence selection, planning, and revision even when using MCQ study items.

Frequently Asked Questions

What is the CMAS Science Grade 11 assessment?

Colorado Measures of Academic Success (CMAS) is Colorado's standards-based statewide summative program. The Grade 11 Science form measures mastery of grade-level Colorado Academic Standards and is developed by CDE with Colorado educators and Pearson.

Is CMAS free for students?

Yes. CMAS is administered through Colorado public schools as a state assessment. Families do not pay an exam fee for standard school-based administration (CDE Assessment FAQs).

How long is the official test?

About 1 hour 40 minutes total across two units (CDE 2025–26 time table lists Grade 11 Science as 1h 40m; Spring 2026 Procedures Manual: two units of 50 minutes each).

What item types appear on the official CMAS?

Official CMAS uses selected-response, technology-enhanced, and often constructed-response or performance/simulation tasks depending on content area. This site offers English four-option MCQ study adaptations only—not an official-format simulation.

How are results reported?

Are these practice questions official CMAS items?

No. These free practice questions are original study aids aligned to Colorado Academic Standards and CMAS frameworks/blueprints. They are not secure official items and do not replace Colorado Practice Resources, classroom instruction, or the official spring assessment.

Who takes CMAS Science?

Students in grades 5, 8, and 11 take grade-level CMAS Science (or CoAlt Science when eligible) at all schools (CDE CMAS overview).

100+ Free CMAS Science Grade 11 Practice Questions

CMAS Science Grade 11

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