Iowa / ITBS Science — Grade 8

📋 Test Overview

Test

Iowa / ITBS-style Science practice

Grade level

Grade 8

Length

practice + challenge + 4 explain prompts — more practice than Testing Mom's Grade 8 science set

Skills

Atoms & the periodic table · chemical reactions & bonding · forces & Newton's laws · motion · energy & conservation · waves (light & sound) · electricity & magnetism · Earth, space & scientific inquiry

How it's upgraded

Each topic is taught first; every answer gets reasoning; a challenge round connects ideas

Standards

MS-PS1–4 · MS-ESS1 · scientific inquiry

Before you start: Grade 8 science focuses on physical science — atoms and reactions, forces and motion, energy, waves, and electricity — plus Earth, space, and how scientists test ideas.

📌 FlyingMinds rule: Use evidence to explain WHY, and test ideas with a fair experiment.

🔮 WARM-UP · NOT SCORED

🦉 Fred asks: Why does a heavier object need more force to speed up the same amount as a lighter one?

Starter: A heavier object needs more force because __________ .

🎯 Practice score: 0 / 56

🟢 Part A — Atoms & the periodic table

Atoms are made of protons, neutrons, and electrons. The periodic table organizes elements by their properties.

MS-PS1 · AtomsCHEMISTRY

1. The positively charged particle in an atom's nucleus is the —

electron neutron proton ion

MS-PS1 · AtomsCHEMISTRY

2. The particle with NO electric charge is the —

neutron proton electron ion

MS-PS1 · AtomsCHEMISTRY

3. Negatively charged particles that move around the nucleus are —

protons electrons neutrons atoms

MS-PS1 · AtomsCHEMISTRY

4. The number of protons in an atom is its —

mass number charge volume atomic number

MS-PS1 · AtomsCHEMISTRY

5. Elements in the periodic table are arranged by increasing —

atomic number color weight in pounds price

MS-PS1 · AtomsCHEMISTRY

6. A vertical column of elements with similar properties is a —

period mixture group (family) compound

MS-PS1 · AtomsCHEMISTRY

7. A pure substance made of only one kind of atom is an —

compound mixture solution element

MS-PS1 · AtomsCHEMISTRY

8. Most of an atom's mass is found in its —

electron cloud nucleus outer shell empty space

🔵 Part B — Chemical reactions & bonding

Atoms join to form compounds. In reactions, atoms rearrange but are never created or destroyed.

MS-PS1 · ReactionsCHEMISTRY

9. In a chemical formula, H₂O means a molecule has —

2 hydrogen atoms and 1 oxygen atom 2 oxygen and 1 hydrogen 2 water atoms 20 atoms

MS-PS1 · ReactionsCHEMISTRY

10. In a balanced equation, the number of atoms is —

greater on the right greater on the left equal on both sides always changing

MS-PS1 · ReactionsCHEMISTRY

11. Two or more elements chemically combined form a —

mixture solution element compound

MS-PS1 · ReactionsCHEMISTRY

12. A bond formed when atoms SHARE electrons is a —

ionic bond covalent bond nuclear bond magnetic bond

MS-PS1 · ReactionsCHEMISTRY

13. A bond formed when one atom TRANSFERS electrons to another is an —

ionic bond covalent bond metallic only neutral bond

MS-PS1 · ReactionsCHEMISTRY

14. Bubbling, a color change, or heat released are signs of a —

physical change only chemical reaction change of state mixture

MS-PS1 · ReactionsCHEMISTRY

15. In a reaction, the starting substances are the —

products catalysts only reactants mixtures

MS-PS1 · ReactionsCHEMISTRY

16. Because of the law of conservation of mass, burning a log in a sealed box would leave the total mass —

much greater much smaller zero the same

🟡 Part C — Forces & Newton's laws

A net force changes an object's motion. Newton's three laws describe how forces and motion are related.

MS-PS2 · ForcesPHYSICS

17. Newton's first law (inertia) says an object in motion will —

always slow down on its own stay in motion unless a force acts on it speed up forever turn into energy

MS-PS2 · ForcesPHYSICS

18. Newton's second law is written as —

F = ma (force = mass × acceleration) F = m ÷ a a = F × m F = mv

MS-PS2 · ForcesPHYSICS

19. Newton's third law says for every action there is —

no reaction a smaller reaction a delayed reaction an equal and opposite reaction

MS-PS2 · ForcesPHYSICS

20. If forces on an object are BALANCED, its motion —

always speeds up always reverses does not change disappears

MS-PS2 · ForcesPHYSICS

21. To accelerate a more massive object the same amount, you need —

more force less force no force negative mass

MS-PS2 · ForcesPHYSICS

22. A rocket pushes gas down and is pushed up. This shows Newton's —

first law only law of gravity only zeroth law third law

MS-PS2 · ForcesPHYSICS

23. The force that opposes motion between two surfaces is —

gravity inertia friction magnetism

MS-PS2 · ForcesPHYSICS

24. Mass measures the amount of matter; weight measures —

the same thing as mass the pull of gravity on that mass the volume the temperature

🟣 Part D — Motion

Speed is distance ÷ time. Velocity adds direction. Acceleration is any change in velocity.

MS-PS2 · MotionPHYSICS

25. A car travels 150 km in 3 hours. Its average speed is —

50 km/h 45 km/h 450 km/h 153 km/h

MS-PS2 · MotionPHYSICS

26. Velocity is different from speed because velocity includes —

temperature mass color direction

MS-PS2 · MotionPHYSICS

27. Acceleration occurs when an object —

stays at rest moves at a steady speed in a line changes its speed or direction weighs more

MS-PS2 · MotionPHYSICS

28. A flat, horizontal line on a distance-time graph means the object is —

speeding up not moving slowing down turning

MS-PS2 · MotionPHYSICS

29. If a runner speeds up from 2 m/s to 6 m/s, the runner is —

decelerating at constant speed accelerating at rest

MS-PS2 · MotionPHYSICS

30. Distance ÷ time gives —

acceleration speed force mass

⚪ Part E — Energy & its conservation

Energy comes in many forms and can change from one to another, but it is never created or destroyed.

MS-PS3 · EnergyPHYSICS

31. Stored energy due to position or condition is —

potential energy kinetic energy thermal only sound only

MS-PS3 · EnergyPHYSICS

32. Energy of motion is —

potential energy chemical energy nuclear energy kinetic energy

MS-PS3 · EnergyPHYSICS

33. Energy cannot be created or destroyed, only —

increased from nothing destroyed by friction transformed from one form to another stored forever unused

MS-PS3 · EnergyPHYSICS

34. A battery powering a flashlight changes chemical energy into —

sound only nuclear energy no energy light and heat energy

MS-PS3 · EnergyPHYSICS

35. As a roller coaster car races downhill, its potential energy changes mostly to —

kinetic energy chemical energy nuclear energy sound only

MS-PS3 · EnergyPHYSICS

36. Energy from the Sun reaches Earth as —

conduction radiation (light) convection sound

MS-PS3 · EnergyPHYSICS

37. The energy stored in the bonds of food and fuel is —

mechanical energy chemical energy sound energy light energy

MS-PS3 · EnergyPHYSICS

38. When energy changes form, some is usually 'lost' to the surroundings as —

mass light only new matter heat

🟢 Part F — Waves: light & sound

Waves carry energy. A wave's frequency and wavelength describe it; light and sound behave differently.

MS-PS4 · WavesPHYSICS

39. The distance between two wave crests is the —

wavelength amplitude frequency speed

MS-PS4 · WavesPHYSICS

40. A wave's height, related to its energy, is its —

wavelength frequency amplitude period

MS-PS4 · WavesPHYSICS

41. Sound waves need a — to travel.

medium (like air or water) vacuum beam of light magnet

MS-PS4 · WavesPHYSICS

42. Light travels — sound.

much slower than at the same speed as much faster than only as fast as

MS-PS4 · WavesPHYSICS

43. Higher frequency sound waves are heard as a —

lower pitch louder volume only silence higher pitch

MS-PS4 · WavesPHYSICS

44. Light bouncing off a mirror is an example of —

refraction reflection absorption conduction

🔵 Part G — Electricity & magnetism

Charges and magnets exert forces. Moving charges make current; electricity and magnetism are linked.

MS-PS2/3 · ElectricityPHYSICS

45. The flow of electric charge through a wire is —

voltage only resistance only mass current

MS-PS2/3 · ElectricityPHYSICS

46. In a circuit, the path electricity follows must be —

broken complete (closed) open invisible

MS-PS2/3 · ElectricityPHYSICS

47. Two like magnetic poles (N and N) will —

attract each other do nothing repel each other melt

MS-PS2/3 · ElectricityPHYSICS

48. A material that lets electricity flow easily is a —

conductor insulator magnet only vacuum

MS-PS2/3 · ElectricityPHYSICS

49. A material that resists the flow of electricity is an —

conductor magnet insulator current

MS-PS2/3 · ElectricityPHYSICS

50. Moving electric charges (current) create a —

sound wave magnetic field new atom chemical bond