Year 9 Science

Free interactive Year 9 Science notes for NSW students: atoms and radioactivity, the periodic table, ecosystems, body systems and disease, plate tectonics, and energy, waves and electricity.

1Pick a chapter below.
2Read and explore: every topic has its own diagrams and an interactive you can play with.
3Test yourself: a quiz, fill the gaps, sorting tasks and exam-style short answers you mark against a marking guide.

Year 9 starts Stage 5 Science. It goes inside the atom, explains the periodic table, and builds on Years 7 and 8 towards the senior sciences. Tap Mark as mastered after each topic to track your progress on this device. No account needed.

Chapters

1 Inside the Atom 8 sections

How the model of the atom developed, protons, neutrons and electrons, isotopes and atomic mass, electron shells and flame tests, radioactivity, half-life, and how radiation is used in medicine, industry, power and dating.

Notes Quizzes
2 The Periodic Table 8 sections

How the periodic table was built, how to read it, metals, non-metals and metalloids, why elements in a group behave alike, ions and ionic compounds, covalent molecules, and which substances conduct electricity.

Notes Quizzes
3 Ecosystems 9 sections

How carbon and nitrogen cycle through ecosystems, photosynthesis and cellular respiration, relationships between organisms, how ecologists measure populations, what makes populations change, and how First Nations knowledge helps manage ecosystems sustainably.

Notes Quizzes
4 Body Systems 11 sections

How the nervous and endocrine systems coordinate the body, reflexes and the brain, hormones, homeostasis and feedback, the senses, how body systems work together, infectious disease, the immune system and vaccination, and non-infectious disease.

Notes Quizzes
5 Plate Tectonics 8 sections

The evidence for plate tectonics, the forces that move plates, how earthquakes and volcanoes happen and are measured, what happens at each kind of plate boundary, Australia's journey north, and the technology used to monitor and warn of geological hazards.

Notes Quizzes
6 Energy on the Move 8 sections

How energy moves by heat, sound, light and electricity: insulating a house, sound waves and sonar, the electromagnetic spectrum, reflection, refraction and lenses, Ohm's law, series and parallel circuits, electrical power and cost, and the efficiency of Australia's energy system.

Notes Quizzes