Science You're Expected to Know · Strategy summary

Science You're Expected to Know: strategy summary

  1. Background from introductory courses helps, but the passage and its figures stay your main source.
  2. Convert mixed units to one unit before comparing; with powers of ten, compare the exponents first.
  3. Density = mass ÷ volume; an object floats in a liquid denser than itself.
  4. pH below 7 is acidic, 7 is neutral, above 7 is basic; a lower pH means more acidic.
  5. Photosynthesis (needs light) takes in CO₂ and releases O₂; respiration (always) uses O₂ and releases CO₂.
  6. Speed = distance ÷ time; without air resistance, heavy and light objects fall together; series current is the same everywhere.
  7. Undisturbed lower rock layers are older; air usually cools with altitude; seasons come from Earth’s tilt.
  8. When a remembered fact and the data disagree, the data win.