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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 3 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. Which changes went back when things cooled?
  2. 2. What would happen to a melted ice cube left in a freezer?
  3. 3. What happened to the bread?
  4. 4. Why is toast different from melted chocolate?
2.Melted chocolate went hard again when it cooled. What does that show?
  • A.Melting chocolate is a change that can be reversed
  • B.Chocolate cannot be heated
  • C.All changes go back
3.Butter and chocolate both melted and went hard again. What do these two have in common?
  • A.Neither changed at all
  • B.Both were burnt
  • C.Both changes could be reversed by cooling
4.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
5.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.Heat it more
  • C.Smell it
6.Which change in the record could NOT be reversed?
  • A.Butter melting
  • B.Chocolate melting
  • C.Bread turning to toast
7.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 tidier
  • C.So it is quicker

LessonPrint · 2-PS1-4 · Set 3 · free to copy for classroom use

Answer key — Heated, Then Cooled Again

Set 3. Prints on its own sheet.

  1. 1.1. The chocolate, the butter and the water all went back. 2. It would go back to solid, like the chocolate went hard again. 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.Melting chocolate is a change that can be reversed
  3. 3.Both changes could be reversed by cooling
  4. 4.It is a change that cannot be undone
  5. 5.Let it cool and see if it goes hard again
  6. 6.Bread turning to toast
  7. 7.So the heating is the same and only the material is different

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