# Science 9 Midterm Practice Study Guide — Units 00–06

## Structure
- 70 objective questions: 10 each from Units 00 through 06
- Three educator-scored practical / constructed responses
- Objective target: 56/70
- Recommended overall mastery: 80/100
- Calculator and blank paper permitted
- Corrections and retakes permitted
- Public practice does not replace the separately supervised, authenticated midterm

## Unit 00 — Foundations / Readiness
Review measurement, units, graph reading, proportional reasoning, scientific notation, evidence and safe laboratory habits.

## Unit 01 — Inquiry & Evidence
Review investigable questions, variables, controls, operational definitions, repeated trials, data integrity, graphs, uncertainty, causation, CER, source evaluation and safety.

## Units 02–05 — Life Science
Review cell structure and transport, energy in cells, homeostasis and feedback, inheritance and probability, variation, ecosystems, populations, biodiversity, energy transfer, matter cycling and evidence-based biological reasoning.

## Unit 06 — Atomic Structure & Periodic Patterns
Review atomic models and evidence, protons/neutrons/electrons, isotopes and ions, weighted atomic mass, periodic organization, valence patterns, line spectra and model limitations.

## Practical reasoning
Be ready to preserve raw data, calculate a rate or percent change, select a graph, distinguish observation from inference, state uncertainty, and revise a method from evidence.