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- The graph shows temperature vs. time for a substance undergoing phase changes.
- Segment A (0–5 min): The substance is in the solid phase, heating up from ~30°C to 70°C.
- Segment B (5–9 min): The substance melts at constant temperature (70°C); this is the melting point.
- Segment C (9–14 min): The substance is in the liquid phase, heating from 70°C to 140°C.
- Segment D (14–18 min): The substance boils at constant temperature (140°C); this is the boiling point.
- Segment E (18–22 min): The substance is in the gas phase, heating above 140°C.
- The flat segments (B and D) indicate phase changes where added heat is used to break intermolecular bonds rather than increase temperature.

Parent Tip: Review the logic above to help your child master the concept of phase change graph worksheet.

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