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Heated, Then Cooled Again is a free printable Grade 2 science worksheet on using a heating record as evidence for which changes reverse, aligned to NGSS performance expectation 2-PS1-4. It prints 7 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two students in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Heated, Then Cooled Again

2-PS1-4

NameDate

Read the record, then answer the questions.

1.Read the record, then answer the questions.

Heated, Then Cooled Again

What happened to four things heated on a warm plate and then left to cool. HEATED, THEN LEFT TO COOL Chocolate ..... melted, then went hard again Butter ........ melted, then went hard again Water ......... turned to steam; the lid dripped water again Bread ......... turned to toast; it stayed toast Egg ........... turned solid; it stayed solid All were heated on the same plate.

  1. 1. What claim does this record support?
  2. 2. Which changes went back when things cooled?
  3. 3. What happened to the bread?
  4. 4. Why is toast different from melted chocolate?
2.Water turned to steam, and drops formed on the lid. What does that show?
  • A.The water came back, so boiling it can be reversed
  • B.The water was destroyed
  • C.Lids make water
3.Why heat every material on the same plate?
  • A.So it is tidier
  • B.So it is quicker
  • C.So the heating is the same and only the material is different
4.Melted chocolate went hard again when it cooled. What does that show?
  • A.All changes go back
  • B.Chocolate cannot be heated
  • C.Melting chocolate is a change that can be reversed
5.Butter and chocolate both melted and went hard again. What do these two have in common?
  • A.Both changes could be reversed by cooling
  • B.Both were burnt
  • C.Neither changed at all
6.A student says "heating always changes things for good." Which result shows that is wrong?
  • A.The egg turned solid
  • B.The bread turned to toast
  • C.The chocolate went hard again when it cooled
7.Wax melts in a warm dish. What test would show whether the change can be reversed?
  • A.Let it cool and see if it goes hard again
  • B.Smell it
  • C.Heat it more

LessonPrint · 2-PS1-4 · Set 25 · free to copy for classroom use

Answer key — Heated, Then Cooled Again

Set 25. Prints on its own sheet.

  1. 1.1. Some changes caused by heating can be reversed and some cannot. 2. The chocolate, the butter and the water all went back. 3. It turned to toast, and it stayed toast. 4. The toast stayed toast when it cooled, but the chocolate went hard again.
  2. 2.The water came back, so boiling it can be reversed
  3. 3.So the heating is the same and only the material is different
  4. 4.Melting chocolate is a change that can be reversed
  5. 5.Both changes could be reversed by cooling
  6. 6.The chocolate went hard again when it cooled
  7. 7.Let it cool and see if it goes hard again

Last reviewed 2026-09-05. Aligned to 2-PS1-4 of the Next Generation Science Standards.