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Stemscopes Exam Cheat Sheet 2026

The 30 highest-yield Stemscopes Exam facts, distilled from real exam questions. Print it, save it as a PDF, or study it here ā€” free, no sign-up.

  1. Which of the following is an example of a qualitative observation? ā†’ The liquid turned blue
  2. What is the primary cause of acid rain? ā†’ Sulfur dioxide and nitrogen oxide emissions
  3. What is the main factor driving the water cycle? ā†’ Solar energy
  4. In a chemical reaction, what are the starting materials called? ā†’ Reactants
  5. Which piece of lab equipment is used to measure the volume of a liquid accurately? ā†’ Graduated cylinder
  6. What is the pH of a neutral solution? ā†’ 7
  7. What is the SI unit of force? ā†’ Newton
  8. What does the law of conservation of mass state in a chemical reaction? ā†’ The total mass of reactants equals the total mass of products
  9. What is the meniscus? ā†’ The curved surface of a liquid in a container
  10. A soccer ball is rolling across a flat field and gradually slows to a stop. Which force is primarily responsible for slowing the ball? ā†’ Friction
  11. Which of the following is an example of a conductor? ā†’ Copper wire
  12. Two forces of 15 N and 10 N act in the same direction on an object. What is the net force? ā†’ 25 N
  13. Which form of heat transfer does NOT require matter? ā†’ Radiation
  14. What is the purpose of error bars on a graph? ā†’ To show the range of uncertainty in data
  15. What is an invasive species? ā†’ A species introduced to a new area that harms the ecosystem
  16. What type of reaction produces a precipitate? ā†’ Double displacement reaction
  17. A ball rolling down a ramp converts which type of energy into kinetic energy? ā†’ Gravitational potential energy
  18. A student pushes a 10 kg box with a net force of 20 N. What is the acceleration of the box? ā†’ 2 m/sĀ²
  19. What is the atomic number of an element? ā†’ Number of protons
  20. What type of bond involves the sharing of electrons between atoms? ā†’ Covalent bond
  21. If the mass of an object doubles while the net force on it stays the same, its acceleration will: ā†’ Decrease by half
  22. Why should you wear safety goggles during a lab experiment? ā†’ They protect your eyes from chemical splashes and debris
  23. What happens to light when it passes from air into glass? ā†’ It slows down and bends toward the normal
  24. What is a keystone species? ā†’ A species that has a disproportionately large impact on its ecosystem
  25. What does a steep slope on a distance-time graph indicate? ā†’ High speed
  26. What causes Earth's seasons? ā†’ Earth's axial tilt
  27. What does the pitch of a sound wave depend on? ā†’ Frequency
  28. Which of the following is a vector quantity? ā†’ Velocity
  29. In an experiment, what is the independent variable? ā†’ The variable that is changed or manipulated
  30. What is a hypothesis? ā†’ A testable prediction
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