Phase Change Worksheet

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  1. 1.What is the change from solid to liquid called?
  2. 2.What is the change from liquid to solid called?
  3. 3.What is the change from liquid to gas called?
  4. 4.What is the change from gas to liquid called?
  5. 5.What is the change straight from solid to gas called?
  6. 6.What is the change straight from gas to solid called?
  7. 7.A block of dry ice shrinks on the table and leaves no puddle. Which change is this?
  8. 8.Frost forms on a car window on a cold, clear night. Which change is this?
  9. 9.Drops of water form on the outside of a glass of iced water. Which change is this?
  10. 10.A puddle dries up on a warm day without boiling. Which change is this?
  11. 11.Solid iodine is warmed and a purple gas rises with no liquid forming. Which change is this?
  12. 12.Water in an ice-cube tray becomes ice. Which change is this?
  13. 13.Which phase changes absorb energy (endothermic)?
  14. 14.Which phase changes release energy (exothermic)?
  15. 15.While ice is melting at 0 °C, what happens to its temperature?
  16. 16.During a phase change, where does the added heat go?
  17. 17.Why can a burn from steam at 100 °C be worse than one from water at 100 °C?
  18. 18.Why does sweating cool you down?
  19. 19.The heat of sublimation equals…
  20. 20.Water vapour condenses into cloud droplets high in the air. What does this do to the surrounding air?
  21. 21.At the triple point of a substance, which phases exist together?
  22. 22.Where is the triple point of water?
  23. 23.A heating curve for water plots temperature against time. What do its flat parts show?
  24. 24.On a heating curve for water at normal pressure, at what temperature is the first flat part?
  25. 25.On a heating curve for water at normal pressure, at what temperature is the second flat part?
  26. 26.On water's heating curve, why is the boiling plateau much longer than the melting plateau?
  27. 27.On a heating curve, what is happening on a sloped part between two plateaus?
  28. 28.A cooling curve for water shows a flat part at 0 °C. What is happening there?
  29. 29.On a heating curve, which states are present on the melting plateau?
  30. 30.On a heating curve, which states are present on the boiling plateau?
  31. 31.How much heat melts 50 g of ice at 0 °C? (Lf = 334 J/g)
  32. 32.How much heat melts 20 g of ice at 0 °C? (Lf = 334 J/g)
  33. 33.How much heat turns 10 g of water at 100 °C into steam? (Lv = 2,260 J/g)
  34. 34.How much heat turns 5 g of water at 100 °C into steam? (Lv = 2,260 J/g)
  35. 35.How much heat is released when 30 g of water at 0 °C freezes? (Lf = 334 J/g)
  36. 36.How much heat is released when 2 g of steam at 100 °C condenses? (Lv = 2,260 J/g)
  37. 37.3,340 J is added to ice at 0 °C. How many grams melt? (Lf = 334 J/g)
  38. 38.45,200 J boils water at 100 °C. How many grams become steam? (Lv = 2,260 J/g)
  39. 39.How much heat turns 10 g of ice at 0 °C into water at 20 °C? (Lf = 334 J/g, c = 4.18 J/g·°C)
  40. 40.How much heat warms 100 g of water from 25 °C to 100 °C, without boiling it? (c = 4.18 J/g·°C)
  41. 41.How much heat turns 1 g of ice at 0 °C all the way into steam at 100 °C? (Lf = 334, Lv = 2,260 J/g; c = 4.18 J/g·°C)
  42. 42.How many kilojoules melt 250 g of ice at 0 °C? (Lf = 334 J/g)
What is the change straight from gas to solid called?

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Unofficial practice questions, not affiliated with any school, textbook publisher or curriculum. Bank checked September 24, 2026.

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How it works

This phase change worksheet has 42 questions: the six changes of state and everyday examples, which changes absorb or release energy, what a heating curve shows, and heat calculations for water.

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Four sets

Name the change covers melting, freezing, vaporization, condensation, sublimation and deposition. Energy in and out sorts endothermic from exothermic. Heating curves explains the flat parts. Heat calculations use q = m × L with water's values given.

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  • Toward gas takes energy in (endothermic); toward solid gives energy out (exothermic).
  • On a heating curve, flat means changing state and sloped means warming up.
  • Sublimation skips the liquid on the way up; deposition skips it on the way down.

Questions and answers

What are the six phase changes?

Melting (solid to liquid), freezing (liquid to solid), vaporization (liquid to gas), condensation (gas to liquid), sublimation (solid to gas) and deposition (gas to solid).

Why does temperature stay the same during a phase change?

The heat goes into pulling the particles apart (or is released as they come together), not into making them move faster, so the temperature holds until the change is complete.

How do you calculate the heat for a phase change?

Multiply the mass by the latent heat: q = m × L. Melting 50 g of ice takes 50 × 334 = 16,700 J; boiling 10 g of water takes 10 × 2,260 = 22,600 J.

All 42 questions with answers

Name the change 12

  • A block of dry ice shrinks on the table and leaves no puddle. Which change is this? Answer: Sublimation. Source: Wikipedia, Sublimation (phase transition). Read 2026-09-24.
  • A puddle dries up on a warm day without boiling. Which change is this? Answer: Vaporization. Source: Wikipedia, Evaporation. Read 2026-09-24.
  • Drops of water form on the outside of a glass of iced water. Which change is this? Answer: Condensation. Source: Wikipedia, Condensation. Read 2026-09-24.
  • Frost forms on a car window on a cold, clear night. Which change is this? Answer: Deposition. Source: Wikipedia, Deposition (phase transition). Read 2026-09-24.
  • Solid iodine is warmed and a purple gas rises with no liquid forming. Which change is this? Answer: Sublimation. Source: Wikipedia, Sublimation (phase transition). Read 2026-09-24.
  • Water in an ice-cube tray becomes ice. Which change is this? Answer: Freezing. Source: Wikipedia, Freezing. Read 2026-09-24.
  • What is the change from gas to liquid called? Answer: Condensation. Source: Wikipedia, Condensation. Read 2026-09-24.
  • What is the change from liquid to gas called? Answer: Vaporization. Source: Wikipedia, Enthalpy of vaporization. Read 2026-09-24.
  • What is the change from liquid to solid called? Answer: Freezing. Source: Wikipedia, Freezing. Read 2026-09-24.
  • What is the change from solid to liquid called? Answer: Melting. Source: Wikipedia, Enthalpy of fusion. Read 2026-09-24.
  • What is the change straight from gas to solid called? Answer: Deposition. Source: Wikipedia, Deposition (phase transition). Read 2026-09-24.
  • What is the change straight from solid to gas called? Answer: Sublimation. Source: Wikipedia, Sublimation (phase transition). Read 2026-09-24.
Show all 42 questions (30 more)

Energy in and out 10

  • At the triple point of a substance, which phases exist together? Answer: Solid, liquid and gas. Source: Wikipedia, Triple point. Read 2026-09-24.
  • During a phase change, where does the added heat go? Answer: Into overcoming the attractions between particles. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • The heat of sublimation equals… Answer: The heat of fusion plus the heat of vaporization. Source: Wikipedia, Sublimation (phase transition). Read 2026-09-24.
  • Water vapour condenses into cloud droplets high in the air. What does this do to the surrounding air? Answer: Warms it, by releasing latent heat. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • Where is the triple point of water? Answer: 0.01 °C (273.16 K), at a very low pressure. Source: Wikipedia, Triple point. Read 2026-09-24.
  • Which phase changes absorb energy (endothermic)? Answer: Melting, vaporization and sublimation. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • Which phase changes release energy (exothermic)? Answer: Freezing, condensation and deposition. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • While ice is melting at 0 °C, what happens to its temperature? Answer: It stays at 0 °C until all the ice has melted. Source: Wikipedia, Enthalpy of fusion. Read 2026-09-24.
  • Why can a burn from steam at 100 °C be worse than one from water at 100 °C? Answer: Condensing steam releases its large latent heat onto the skin. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • Why does sweating cool you down? Answer: Evaporating sweat takes heat from your skin. Source: Wikipedia, Evaporation. Read 2026-09-24.

Heating and cooling curves 8

  • A cooling curve for water shows a flat part at 0 °C. What is happening there? Answer: The water is freezing. Source: Wikipedia, Enthalpy of fusion. Read 2026-09-24.
  • A heating curve for water plots temperature against time. What do its flat parts show? Answer: A phase change, when temperature stays the same. Source: Wikipedia, Enthalpy of fusion. Read 2026-09-24.
  • On a heating curve for water at normal pressure, at what temperature is the first flat part? Answer: 0 °C. Source: Wikipedia, Enthalpy of fusion. Read 2026-09-24.
  • On a heating curve for water at normal pressure, at what temperature is the second flat part? Answer: 100 °C. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • On a heating curve, what is happening on a sloped part between two plateaus? Answer: One state is getting hotter. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • On a heating curve, which states are present on the boiling plateau? Answer: Liquid and gas together. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • On a heating curve, which states are present on the melting plateau? Answer: Solid and liquid together. Source: Wikipedia, Enthalpy of fusion. Read 2026-09-24.
  • On water's heating curve, why is the boiling plateau much longer than the melting plateau? Answer: Vaporizing takes about 7 times more energy than melting. Source: Wikipedia, Latent heat. Read 2026-09-24.

Heat calculations 12

  • 3,340 J is added to ice at 0 °C. How many grams melt? (Lf = 334 J/g) Answer: 10 g. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • 45,200 J boils water at 100 °C. How many grams become steam? (Lv = 2,260 J/g) Answer: 20 g. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • How many kilojoules melt 250 g of ice at 0 °C? (Lf = 334 J/g) Answer: 83.5 kJ. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • How much heat is released when 2 g of steam at 100 °C condenses? (Lv = 2,260 J/g) Answer: 4,520 J. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • How much heat is released when 30 g of water at 0 °C freezes? (Lf = 334 J/g) Answer: 10,020 J. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • How much heat melts 20 g of ice at 0 °C? (Lf = 334 J/g) Answer: 6,680 J. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • How much heat melts 50 g of ice at 0 °C? (Lf = 334 J/g) Answer: 16,700 J. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • How much heat turns 1 g of ice at 0 °C all the way into steam at 100 °C? (Lf = 334, Lv = 2,260 J/g; c = 4.18 J/g·°C) Answer: 3,012 J. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • How much heat turns 5 g of water at 100 °C into steam? (Lv = 2,260 J/g) Answer: 11,300 J. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • How much heat turns 10 g of ice at 0 °C into water at 20 °C? (Lf = 334 J/g, c = 4.18 J/g·°C) Answer: 4,176 J. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • How much heat turns 10 g of water at 100 °C into steam? (Lv = 2,260 J/g) Answer: 22,600 J. Source: Wikipedia, Latent heat. Read 2026-09-24.
  • How much heat warms 100 g of water from 25 °C to 100 °C, without boiling it? (c = 4.18 J/g·°C) Answer: 31,350 J. Source: Wikipedia, Latent heat. Read 2026-09-24.

How this list was compiled: Questions, wrong choices and explanations were written for this site. Facts were checked on Wikipedia (Phase transition, Enthalpy of fusion, Latent heat and its table of water values, Sublimation, Deposition, Condensation, Evaporation, Freezing, Triple point), each named in the question's source line and read 2026-09-24. Licence: own work

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