Mississippi Science CHE.7.2
The Standard
- CHE.7
- Students will demonstrate an understanding of the structure and behavior of gases.
Enrichment: Use an engineering design process to develop models (e.g., online simulations or student interactive activities) to explain and predict the behavior of each state of matter using the movement of particles and intermolecular forces to explain the behavior of matter. *
2026 Mississippi College- and Career-Readiness Standards for Science · Gas Laws
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students build particle models of solids, liquids, gases, and plasma. They use the models to predict what happens when energy is added or removed, then revise them against evidence.
What Mastery Looks Like
- Their models show particle spacing and motion in each state, and how attraction affects solids, liquids, and gases. They show plasma as moving ions and electrons, not intact molecules. They can explain why they changed a model after it made a wrong prediction.
Common Misconceptions
- Students may draw liquid particles as far apart as gas particles or show solid particles as completely still. They may think heating adds new particles, or that plasma is just a hot gas with intact molecules.
How to Assess It
- Give students an incorrect sketch of a liquid with widely spaced, motionless particles. Ask them to redraw it, explain two fixes using motion and attraction, and predict what changes if it evaporates.
Lesson moves
Ways to Teach It
Give groups magnetic counters and lidded trays; shake at two speeds, then revise a particle model when the counters fail to mimic a gas.
Ask students to write why perfume spreads through a room while a sugar cube keeps its shape, using particle motion and attraction.
Show four particle diagrams, including plasma; pairs match them to states and predict how adding energy changes each one.
Show a neon sign photo; have students label the moving ions and electrons that make its glowing gas different from ordinary gas.
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Printable CHE.7.2 Worksheet
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Related Standards
- PHY.3.6
Enrichment: Design, conduct, and communicate investigations that explore how temperature and thermal energy relate to molecular motion and states of matter.
- ESS.4.4
Enrichment: Use an engineering design process to research, develop, and test models to aid in the responsible management of natural resources (e.g., recycling, ...
- CHE.7.5
Enrichment: Use an engineering design process and online simulations or lab investigations to design and model the results of controlled scientific investigatio...
- CHE.10.1
Enrichment: Construct explanations to explain how temperature and heat flow in terms of the motion of molecules (or atoms).
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