Public learning track
Matter, Density, and Kinetic-Molecular Theory
7th Grade · Science · Open Global Science
8 lessons
Goal
Explain states of matter, thermal expansion, diffusion, and Brownian motion using particle models, and calculate mass, volume, and density.
Featured Diagrams
How Particles Behave in Solids, Liquids, and Gases
8 lessons
0 of 8 done
- 1How Particles Behave in Solids, Liquids, and GasesUp nextStart
- 2Particle Arrangements and Density in Solids, Liquids, and GasesPremiumNot started yet
- 3How Thermal Energy Changes Particle MotionNot started yet
- 4Thermal Expansion in Liquids: How Heating Changes Liquid VolumeNot started yet
- 5Diffusion and Brownian Motion in FluidsNot started yet
- 6Measuring Mass and Volume in the LaboratoryNot started yet
- 7Calculating Density Using Water DisplacementNot started yet
- 8Calculating Pressure from Atomic Collision ForcesNot started yet
Standards Covered
- OGS.8.PS.1Open Global Science Standards 2026™ · Science · Level 8 / Grade 7 (Age 12) · Grade 7Use particle theory and the kinetic-molecular model to explain the states of matter, thermal expansion, diffusion, and Brownian motion, relating microscopic particle arrangements and kinetic energies to macroscopic properties.
- OGS.8.PS.5Open Global Science Standards 2026™ · Science · Level 8 / Grade 7 (Age 12) · Grade 7Measure and distinguish mass, volume, and density for solids and liquids, applying quantitative formulas and experimental techniques including balance scales and displacement.
Curriculum Framework
7th Grade · Science · Open Global Science
1
8 lessons
Matter, Density, and Kinetic-Molecular Theory
Explain states of matter, thermal expansion, diffusion, and Brownian motion using particle models, and calculate mass, volume, and density.
2
7 lessons
Pure Substances, Mixtures, and the Periodic Table
Classify matter into elements, compounds, and mixtures, use chemical formulas, and apply periodic trends to predict reactivity.
3
6 lessons
Inorganic Compounds, Acids, Bases, and Salts
Analyze inorganic classes, electrolytic dissociation, pH balance, and neutralization reactions.
4
7 lessons
Kinematics: One- and Two-Dimensional Motion
Analyze motion using scalar and vector quantities, calculate velocity and acceleration, and interpret kinematic graphs.
5
8 lessons
Dynamics, Newton's Laws, and Friction
Apply Newton's three laws of motion, momentum conservation, and friction models to describe object dynamics.
6
7 lessons
Rotational Motion and Fluid Mechanics
Model circular motion dynamics, hydrostatic pressure, communicating vessels, and Archimedes' principle.
7
9 lessons
Work, Power, Energy, and Oscillations
Calculate mechanical work, power, kinetic and potential energy, simple machine efficiency, and simple harmonic oscillations.
8
8 lessons
Thermal Physics and Thermodynamics
Investigate conduction, convection, radiation, specific heat, latent heat, and thermodynamic laws.
9
10 lessons
Electrostatics and Direct-Current Circuits
Analyze electric charges, fields, potentials, and construct DC circuits using Ohm's, Joule's, and Kirchhoff's laws.
10
7 lessons
Electromagnetism, Induction, and AC Systems
Investigate magnetic fields, electromagnetic induction, motors, transformers, relays, and alternating current.
11
7 lessons
Wave Phenomena and Geometric Optics
Model wave behaviors including interference, diffraction, Doppler effect, reflection, refraction, and optical technologies.
12
11 lessons
Quantum Phenomena and Nuclear Physics
Analyze wave-particle duality, atomic emission/absorption spectra, radioactive decay, nuclear reactions, and mass-energy equivalence.