1. The phase change diagram shows temperature vs. heat added for a substance.
2. Segment A represents the solid phase heating up from -20°C to 0°C.
3. Segment B is the melting process at 0°C, where heat is absorbed without temperature change.
4. Segment C is the liquid phase heating from 0°C to 100°C.
5. Segment D is the boiling process at 100°C, where heat is absorbed without temperature change.
6. Segment E is the gas phase heating above 100°C.
7. The flat segments (B and D) indicate phase changes: melting and boiling, respectively.
8. The slope of each slanted segment indicates the specific heat capacity of that phase.
9. The length of the flat segments indicates the amount of latent heat required for the phase change.
10. The total heat required for the entire process is the sum of all segments’ areas under the curve.
Parent Tip: Review the logic above to help your child master the concept of phase change graph worksheet.
