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100+ Free OSTP Science Grade 8 Practice Questions

Prepare for the Oklahoma School Testing Program — Science, Grade 8 exam with instant access — no signup required.

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Key Facts: OSTP Science Grade 8 Exam

OSDE

Administering agency

Oklahoma State Department of Education

Cognia

Testing vendor

OSDE Assessment Materials

15 clusters (~45 items)

Operational clusters

Grade 8 Science Test Blueprint

Life Sciences, 40-46%

Largest reporting category

Grade 8 Science Test Blueprint

OPI 200-399; 300 = Proficient

Score scale

OSDE Understanding OSTP Results

Practise for the OSTP Grade 8 Science test with 100 free questions weighted to the official OSDE blueprint, where Life Sciences leads at 40-46%. The real test uses three-item phenomenon clusters; this English-language MCQ bank is a study aid, not a format simulation.

Sample OSTP Science Grade 8 Practice Questions

Try these sample questions to test your OSTP Science Grade 8 exam readiness. Each question includes a detailed explanation. Start the interactive quiz above for the full 100+ question experience with AI tutoring.

1A model of an atom is labeled to show three kinds of subatomic particle: protons, neutrons and electrons. Which statement correctly identifies the electrical charge and relative location of each of these particles?
A.Protons have a positive charge and neutrons have no charge, both residing in the nucleus; electrons have a negative charge and reside outside the nucleus.
B.Protons have a negative charge and electrons have a positive charge, both residing inside the nucleus; neutrons orbit outside.
C.Electrons have no charge and neutrons have a positive charge, residing in the nucleus; protons orbit outside.
D.All subatomic particles carry a positive charge and are evenly distributed throughout the entire atom.
Explanation: An atom consists of a dense central nucleus containing positively charged protons and uncharged (neutral) neutrons. Negatively charged electrons occupy the surrounding electron cloud outside the nucleus.
2What fundamental distinction exists between molecular substances and extended crystal structures?
A.Molecular substances contain distinct, independent molecular units, whereas extended structures consist of an interconnected repeating network of bonded atoms.
B.Molecular substances are always solids at room temperature, while extended structures are always gases.
C.Extended structures do not contain chemical bonds between constituent atoms.
D.Molecular substances contain millions of different elements, whereas extended structures contain only one atom total.
Explanation: Molecular compounds like water form isolated, distinct groups of bonded atoms (molecules). Extended structures like quartz or salt consist of vast, continuous repeating 3D networks of bonded atoms or ions without discrete molecular boundaries.
3Which statement describes how synthetic materials are created from natural resources?
A.Natural resources undergo chemical synthesis, where chemical reactions rearrange atoms to produce materials with properties distinct from the original raw materials.
B.Synthetic materials are gathered directly from nature without undergoing any physical or chemical processing.
C.Natural resources are physically mixed without breaking or forming any chemical bonds to create synthetic polymers.
D.Synthetic materials are created out of empty space without using any natural matter or energy.
Explanation: Synthetic materials are synthesized by chemically altering natural resources. Chemical reactions break existing chemical bonds and form new ones, rearranging atoms into polymers or compounds with brand-new physical and chemical properties.
4Which observation provides empirical evidence that a chemical reaction occurred?
A.The formation of a new gas and a thermal energy change indicate that chemical bonds rearranged to form new substances.
B.The total liquid volume in the beaker increased because the water expanded.
C.The tablet sank to the bottom of the beaker due to gravitational attraction.
D.The water remained clear and transparent throughout the experiment.
Explanation: Gas production (bubbling) and temperature changes (endothermic heat absorption) are classic indicators of a chemical reaction, showing that atomic bonds broke and reformed to produce new substances with different chemical properties.
5What reading will the digital balance show after the chemical reaction completes?
A.150 g, because the total number and types of atoms are conserved in a closed system during a chemical reaction.
B.120 g, because gas escaping into the air reduces the mass of the closed flask.
C.180 g, because new gas molecules add extra weight to the system.
D.0 g, because chemical energy destroys mass during reaction.
Explanation: According to the Law of Conservation of Mass, matter is neither created nor destroyed during a chemical reaction. In a closed system, all product gas remains trapped, so total mass before reaction equals total mass after reaction.
6Two reactions are run in identical insulated cups, each fitted with a thermometer. [Observation Table] - Reaction A: A magnesium strip is dropped into hydrochloric acid; the mixture warms from 21°C to 34°C. - Reaction B: Barium hydroxide crystals are stirred with ammonium chloride; the mixture cools from 21°C to 4°C. Which classification correctly categorizes these two reactions?
A.Reaction A is exothermic because thermal energy is released; Reaction B is endothermic because thermal energy is absorbed.
B.Reaction A is endothermic because thermal energy is created; Reaction B is exothermic because thermal energy is destroyed.
C.Both reactions are exothermic because both involve mixing chemical substances.
D.Both reactions are endothermic because temperature changes only occur when heat enters a system.
Explanation: Exothermic reactions release thermal energy to the surroundings, causing ambient temperature to increase (Reaction A). Endothermic reactions absorb thermal energy from surroundings, causing ambient temperature to decrease (Reaction B).
7A student writes the balanced equation for the combustion of methane and counts the atoms on each side: CH4 + 2 O2 -> CO2 + 2 H2O [Atom Count] - Reactants: 1 carbon, 4 hydrogen, 4 oxygen - Products: 1 carbon, 4 hydrogen, 4 oxygen Which scientific principle does this balanced equation model demonstrate?
A.The Law of Conservation of Mass, showing that the total number of each type of atom remains identical before and after the reaction.
B.The Law of Universal Gravitation, showing that heavy atoms attract light atoms in fixed ratios.
C.The Cell Theory, showing that molecules divide to form daughter compounds.
D.The Continental Drift Theory, showing that elements drift across the periodic table during combustion.
Explanation: A balanced chemical equation demonstrates the Law of Conservation of Mass by showing that the exact same count of each element's atoms exists in the reactants and products, proving matter is conserved.
8Why do the physical properties of iron sulfide differ completely from iron and sulfur?
A.Chemical bonding created a new substance with unique chemical and physical properties distinct from its constituent elements.
B.Heating melted the elements together without changing their internal atomic structures.
C.Iron lost all its protons during heating, changing into sulfur atoms.
D.Physical mixing altered the magnetic poles of the iron filings.
Explanation: When elements react chemically, they form chemical bonds to yield a brand-new compound (iron sulfide) with distinct physical and chemical properties different from those of the original reactant elements.
9Students activate four identical glowsticks and place each in a water bath at a different temperature, then record how long each glowstick keeps glowing brightly. [Data Table: Water Temperature vs Bright-Glow Duration] - 5°C: 9 hours - 20°C: 5 hours - 40°C: 2 hours - 60°C: 45 minutes What conclusion is best supported by this experimental data?
A.Increasing thermal energy increases particle kinetic energy and collision frequency, accelerating the chemical reaction rate.
B.Lowering temperature creates new chemical reactants that consume light energy faster.
C.Thermal energy destroys glowstick chemicals, preventing light production in hot water.
D.Reaction rates are completely independent of ambient water temperature.
Explanation: Higher temperatures increase the kinetic energy of reactant particles. Particles move faster and collide more frequently with sufficient energy, significantly increasing the rate of the chemical reaction.
10A heavy textbook rests on the flat bench seat of a school bus travelling at a steady speed. The driver brakes suddenly, and the textbook slides forward off the seat. Which statement explains this behavior using Newton's First Law of Motion?
A.The textbook possesses inertia and continues moving forward at its original velocity until an unbalanced force stops it.
B.A forward force pushes the textbook when the bus brakes are pressed.
C.The textbook loses gravitational mass when the bus decelerates.
D.Air pressure inside the bus pulls objects toward the windshield during braking.
Explanation: According to Newton's First Law (Inertia), an object in motion remains in motion with constant velocity unless acted upon by an external unbalanced force. When the bus stops, inertia keeps the book moving forward relative to the seat.

About the OSTP Science Grade 8 Exam

The OSTP Grade 8 Science assessment measures proficiency against the Oklahoma Academic Standards for Science using a three-dimensional, phenomenon-based cluster format. Life Sciences dominates the blueprint at 40-46% — genetics, heredity, the fossil record and natural selection — followed by forces, fields and waves in Physical Sciences.

Assessment

Online cluster-based test delivered in two sections. Each of the 15 operational clusters aligns to one Oklahoma Academic Standard with its Disciplinary Core Idea(s), Science and Engineering Practice and Crosscutting Concept. Blueprint: Life Sciences 40-46%, Physical Sciences 33-40%, Earth and Space Sciences 21-27%.

Time Limit

Approximately 135 minutes across two sections of 50-60 minutes each (suggested maximum 270 minutes); not strictly timed

Passing Score

No pass/fail mark. Reported on the Oklahoma Performance Index (OPI) 200–399 scale, where 300 is always Proficient, in four performance levels: Below Basic, Basic, Proficient, Advanced.

Exam Fee

No fee to students (Oklahoma State Department of Education (OSDE); delivered under contract by Cognia)

OSTP Science Grade 8 Exam Content Outline

40-46%

Life Sciences

Reproductive behaviours and structures, environmental and genetic influences on growth, mutations and protein structure, asexual versus sexual reproduction, fossil-record patterns, anatomical and embryological evidence, natural selection, artificial selection and mathematical models of trait frequency (8.LS1, 8.LS3, 8.LS4).

33-40%

Physical Sciences

Newton's Third Law and collisions, forces and motion, electric and magnetic forces, gravitational interactions, fields between non-contacting objects, wave amplitude and energy, and digitized signals (8.PS2, 8.PS4).

21-27%

Earth and Space Sciences

Earth-sun-moon models of lunar phases, eclipses and seasons, the role of gravity in motions within galaxies and the solar system, and scale properties of solar-system objects (8.ESS1).

How to Pass the OSTP Science Grade 8 Exam

What You Need to Know

  • Passing score: No pass/fail mark. Reported on the Oklahoma Performance Index (OPI) 200–399 scale, where 300 is always Proficient, in four performance levels: Below Basic, Basic, Proficient, Advanced.
  • Assessment: Online cluster-based test delivered in two sections. Each of the 15 operational clusters aligns to one Oklahoma Academic Standard with its Disciplinary Core Idea(s), Science and Engineering Practice and Crosscutting Concept. Blueprint: Life Sciences 40-46%, Physical Sciences 33-40%, Earth and Space Sciences 21-27%.
  • Time limit: Approximately 135 minutes across two sections of 50-60 minutes each (suggested maximum 270 minutes); not strictly timed
  • Exam fee: No fee to students

Keys to Passing

  • Work through all 100 available questions
  • Review every answer and explanation
  • Track weak areas and revisit them
  • Use our AI tutor for tough concepts

OSTP Science Grade 8 Study Tips from Top Performers

1Life Sciences is the biggest category — concentrate on mutations and protein function, asexual versus sexual reproduction, and how natural selection changes trait frequencies over time.
2Practise reading fossil-record, embryology and anatomy comparisons to infer ancestral relationships.
3For physical science, work through Newton's Third Law in collisions, how mass and net force change motion, and how fields act at a distance.
4Review wave amplitude versus energy and why digitized signals transmit information more reliably than analog signals.
5For Earth and space science, be able to model lunar phases, eclipses and seasons and to compare scale properties across the solar system.

Frequently Asked Questions

How many questions are on the official OSTP Grade 8 Science test?

The operational test contains 15 clusters. Each cluster has three items — either three multiple-choice items, or two multiple-choice items plus a technology-enhanced item — so about 45 operational items in total.

Which reporting category carries the most weight?

Life Sciences, at 40-46% of the test. Physical Sciences is 33-40% and Earth and Space Sciences is 21-27%.

Can students use a calculator on the science test?

Yes. Scientific calculators meeting the OSTP general requirements are allowed for Grade 8 mathematics and science, and a Desmos calculator is available in the OSTP Student Kiosk for Grade 8 science.

Is there a passing score?

No. Results are reported on the Oklahoma Performance Index scale of 200–399, where 300 is always Proficient, and in four performance levels: Below Basic, Basic, Proficient and Advanced.

Is the Grade 8 Science test available in Spanish?

Yes. Cognia offers Spanish online forms for Grades 5 and 8 Science, along with Spanish text-to-speech; students must be scheduled for the Spanish test.