Heating Curves & Phase-Change Energy — Drills · Grade 11 Science
Chapter: States of Matter & GasesWhat these drills covers
By the end of Heating Curves & Phase-Change Energy you should be able to:
- I can identify phase-change and temperature-change stages on a heating curve.
- I can add sensible and latent energy contributions with appropriate constants.
2 questions, numeric and written answer, each with a worked explanation.
Vocabulary used: latent heat, plateau.
Problem 1
Melt 5 g ice at 0°C using Lf=334 J/g.
Hints
Write the relationship first; substitute with consistent units.
Answer and explanation
1670 J
mL=5×334.
Problem 2
Why is q=mcΔT insufficient across a melting plateau?
Answer and explanation
It includes sensible heating but omits latent heat needed to change phase.
Response criteria
- State a scientifically accurate conclusion.
- Show the calculation or mechanism that supports it.
- Include units, conditions, or limits where relevant.