States of matter and gases
What students will learn
Explain bulk properties, phase arrangements and gas behavior with particle models whose assumptions and controlled variables are explicit.
Before this topic
- Molecular shape and polarity
- Moles, ratios and unit cancellation
Read and connect
Read: Intermolecular and Interparticle Forces →
Draw the available interactions for a pair of particles, including mixed-pair hydrogen bonding and dispersion.
Read: Properties of Solids →
Link solid structure, particle mobility and disrupted contacts to observed material properties.
Read: Solids, Liquids, and Gases →
Represent motion, spacing and intact particle identity in solids, liquids and gases.
Read: Ideal Gas Law →
Use the ideal gas law and partial pressures with fixed-variable labels and compatible units.
Read: Kinetic Molecular Theory →
Distinguish speed and energy distributions and relate wall momentum transfer to gas pressure.
Read: Deviation from Ideal Gas Law →
Use matched conditions to distinguish attraction and excluded-volume effects from ideal behavior.
Supporting reading: Structure of Ionic Solids →
Revisit the ionic-array model when explaining phase-dependent conduction and brittleness.
Supporting reading: Structure of Metals and Alloys →
Revisit metallic and alloy structure when explaining conduction and layer motion.
Supporting reading: Energy of Phase Changes →
Later energy connection: account for warming and phase-transition segments separately.
Before this connection: Energy transfer and enthalpy: heat capacity, heat balance and phase enthalpy.
Supporting reading: Introduction to Entropy →
Later entropy connection: compare accessible particle and energy arrangements through phase or volume change.
Before this connection: Energy transfer and enthalpy; Entropy and standard free energy.
Check understanding
Use the complete prompt to make student reasoning visible, then consult the separate worked reasoning and criteria. A reading completion tick records reading history.
Choose a graph that reveals the gas relationship →
Linearize pressure-volume data with correct slope units and remove the supplied water-vapor pressure.
Construct kinetic particle sketches →
Create equal-volume intact-molecule layouts with varied speed arrows, compare typical speeds, and justify equal ideal pressures at equal n, V and T.
The task requires constructed sketches or coordinate layouts. It is an ideal model with equal amounts and temperature, not measured molecular trajectories.
Use evidence to distinguish softening from bond cleavage →
Explain a polymer flexibility change and name evidence that could distinguish changed contacts from a changed covalent backbone.
Standards and earlier reading lists
These topic placements organize reading. Edition-qualified Standards mappings and the existing complete unit task sets retain their reviewed scope.