Units
All 5 units of Science 9. Each one has a concepts page to learn from, practice questions marked as you go, and quizzes built at random.
Unit 1
Unit A: Biological diversity
Why no two living things are exactly alike: variation, the two ways living things reproduce, how DNA carries traits from parent to offspring, and what people are doing to the variety of life.
Unit 2
Unit B: Matter and chemical change
Working safely with chemicals, what atoms are made of and how to read the periodic table, the two kinds of compounds, and how to tell when a chemical change has really happened.
Unit 3
Unit C: Environmental chemistry
The chemicals living things need and the ones that harm them: nutrients, acids and bases, why the dose decides the toxicity, and where a pollutant goes once it is released.
Unit 4
Unit D: Electrical principles and technologies
Current, voltage and resistance, and the one law that links them. Then power, energy and efficiency, all the way to what an appliance costs to run.
Studying for the exam?
Mix every unit together
Build a random quiz drawn from all 70 questions across every unit, at the level you choose. It is the closest thing here to a real exam.