Particle model of matter — WJEC GCSE Physics
In summary: Particle model of matter is a key topic in WJEC GCSE Physics. Key exam tip: Ensure you can define density and perform calculations using the density formula
Exam Tips for Particle model of matter
- Ensure you can define density and perform calculations using the density formula
- Be prepared to explain why gases are compressible compared to solids and liquids
- Remember that mass is conserved during changes of state
- Practice using the pV = constant equation and rearranging it to solve for different variables
Common Mistakes
- Confusing physical changes with chemical changes
- Incorrectly applying the pV = constant relationship when temperature is not constant
- Failing to specify that pressure in a gas acts at right angles to a surface
- Misinterpreting the effect of volume changes on gas pressure at a constant temperature
Marking Points
- Definition of density as mass divided by volume
- Explanation of density differences between solids, liquids, and gases based on particle arrangement
- Conservation of mass during physical changes like melting, freezing, and evaporation
- Distinction between physical and chemical changes regarding reversibility
- Relationship between gas molecule motion, temperature, and pressure
- Explanation of pressure as a net force at right angles to a surface
- Application of the relationship pV = constant for a fixed mass of gas at constant temperature
- Explanation of how doing work on a gas can increase its temperature
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