Grade 9: Science
Start with a unit whose prerequisites fit. Work through the lessons, use the study guide to review, and try the new cases before continuing.
- Unit 1 · 4 lessons
Cell Transport and Boundaries
Model exchange across cell membranes and connect it to gradients.
Before you begin: Read or listen to supplied scientific descriptions and follow a labeled diagram. · Use signed quantities, ratios, exponents and the explicitly supplied model formulas.
- Unit 2 · 4 lessons
Biomolecules and Enzymes
Connect molecular structure to biological functions and reaction catalysis.
Before you begin: Read or listen to supplied scientific descriptions and follow a labeled diagram. · Use signed quantities, ratios, exponents and the explicitly supplied model formulas.
- Unit 3 · 4 lessons
Photosynthesis and Cellular Respiration
Trace matter and energy through biological chemical processes.
Before you begin: Read or listen to supplied scientific descriptions and follow a labeled diagram. · Use signed quantities, ratios, exponents and the explicitly supplied model formulas.
- Unit 4 · 4 lessons
Ecology, Populations and Sampling
Use density, sampling and interaction evidence without population overclaims.
Before you begin: Read or listen to supplied scientific descriptions and follow a labeled diagram. · Use signed quantities, ratios, exponents and the explicitly supplied model formulas.
- Unit 5 · 4 lessons
Conserving atoms and predicting reaction amounts
Use balanced symbolic models, mass boundaries, and stoichiometric ratios.
Before you begin: Count formula atoms; multiply ratios; interpret grams and moles as different units.
- Unit 6 · 4 lessons
Atomic Structure and Periodic Patterns
Explain particles, ions, isotopes and periodic organization.
Before you begin: Read or listen to supplied scientific descriptions and follow a labeled diagram. · Use signed quantities, ratios, exponents and the explicitly supplied model formulas.
Check what you can explain
The subject test uses additional supplied cases across these units. Its feedback links back to the relevant lessons. Use it to plan practice; a score on these questions is not a school grade or proof of complete subject mastery.
Open the subject test