Mississippi Science CHE.7.4
The Standard
- CHE.7
- Students will demonstrate an understanding of the structure and behavior of gases.
Use mathematical computations to describe relationships comparing pressure, temperature, volume, and number of particles, including Boyle’s law, Charles’s law, Dalton’s law, combined gas laws, and ideal gas laws.
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 choose an equation based on which gas quantities change and which stay fixed. They calculate pressure, volume, Kelvin temperature, or moles, and add partial pressures for gas mixtures.
What Mastery Looks Like
- Given a word problem, a student identifies what stays fixed, chooses the right equation, and solves with units. They can explain why pressure rises when volume falls at fixed temperature.
Common Misconceptions
- Students often use Celsius instead of Kelvin. They may think pressure and volume both rise in a sealed sample at fixed temperature, or average partial pressures instead of adding them.
How to Assess It
- Exit ticket: A sealed 2.0 L gas sample is at 1.0 atm and 300 K. It is compressed to 1.0 L and heated to 450 K. Find its final pressure and show your equation.
Lesson moves
Ways to Teach It
Connect a plastic syringe to a pressure sensor, record pressure at five marked volumes, and plot the readings.
Write two sentences explaining why a gas expands when its Kelvin temperature doubles, if pressure and particle count stay fixed.
Give pairs Boyle, Charles, Dalton, combined, and ideal gas problem cards; have them sort by known quantities and solve one from each pile.
Calculate the moles of air in a 2.0 L party balloon at 1.0 atm and 300 K using PV = nRT.
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Printable CHE.7.4 Worksheet
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Related Standards
- CHE.8.3
Analyze and interpret data to predict the effect of temperature and pressure on solids and gases dissolved in water.
- CHE.7.6
Use the ideal gas law to support the prediction of volume, mass, and number of particles produced in chemical reactions (i.e., gas stoichiometry).
- CHE.7.1
Analyze the behavior of ideal and real gases in terms of pressure, volume, temperature, and number of particles.
- P.7.5B.2
Use evidence from multiple scientific investigations to communicate the relationships between pressure, volume, density, and temperature of a gas.
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