Matter and Atoms
7th Grade Science · 9 lessons
Start lesson 1
Lessons
- 1Atoms and ElementsAtoms are the basic building blocks of matter. Each element is made of one type of atom. Hydrogen has the simplest atom with just one proton and one electron.Lesson
- 2Acids and BasesAcids have a pH below 7 and taste sour, while bases have a pH above 7 and feel slippery. A pH of 7 is neutral, like pure water.Experiment
- 3Molecules and BondsMolecules form when two or more atoms bond together. A water molecule has two hydrogen atoms bonded to one oxygen atom, written as H₂O.Lesson
- 4Compounds vs Their ElementsA compound's properties differ from its elements. Sodium is a reactive metal and chlorine is a toxic gas, but together they form sodium chloride—common table salt.Experiment
- 5Phase DiagramsPhase diagrams show how temperature and pressure affect the state of matter. Water's triple point is where solid, liquid, and gas phases all exist simultaneously.Lesson
- 6Plasma: The Fourth StatePlasmas form when gases are heated to extremely high temperatures, stripping electrons from atoms. Stars, lightning, and neon signs all contain plasma.Lesson
🖨️
View in ShopGet all 9 Matter and Atoms lessons as PDF
Printable worksheets & answer keys — $4.99