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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.

Set 17 of 25 · the same problems every time you open this link.

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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 happened to the chocolate?
  2. 2. What happened to the bread?
  3. 3. Why is toast different from melted chocolate?
  4. 4. What claim does this record support?
2.Which is the best evidence that a change can be reversed?
  • A.The change happened quickly
  • B.The material looks nice afterward
  • C.The material goes back to how it was when it is cooled or warmed again
3.Why heat every material on the same plate?
  • A.So the heating is the same and only the material is different
  • B.So it is quicker
  • C.So it is tidier
4.Melted chocolate went hard again when it cooled. What does that show?
  • A.All changes go back
  • B.Melting chocolate is a change that can be reversed
  • C.Chocolate cannot be heated
5.Toast stayed toast when it cooled. What would a student say about toasting?
  • A.It is a change that cannot be undone
  • B.It undoes itself overnight
  • C.It is the same as melting
6.Wax melts in a warm dish. What test would show whether the change can be reversed?
  • A.Heat it more
  • B.Smell it
  • C.Let it cool and see if it goes hard again
7.Which change in the record could NOT be reversed?
  • A.Chocolate melting
  • B.Bread turning to toast
  • C.Butter melting

LessonPrint · 2-PS1-4 · Set 17 · free to copy for classroom use

Answer key — Heated, Then Cooled Again

Set 17. Prints on its own sheet.

  1. 1.1. It melted, then went hard again. 2. It turned to toast, and it stayed toast. 3. The toast stayed toast when it cooled, but the chocolate went hard again. 4. Some changes caused by heating can be reversed and some cannot.
  2. 2.The material goes back to how it was when it is cooled or warmed again
  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.It is a change that cannot be undone
  6. 6.Let it cool and see if it goes hard again
  7. 7.Bread turning to toast

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