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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 12 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. Why is toast different from melted chocolate?
  2. 2. What would happen to a melted ice cube left in a freezer?
  3. 3. What happened to the chocolate?
  4. 4. What claim does this record support?
2.An egg turned solid when heated and stayed solid when cooled. What does that show?
  • A.Cooking an egg is a change that cannot be reversed
  • B.Cooling undoes every change
  • C.Eggs are always solid
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 tidier
  • C.So it is quicker
4.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
5.Which is the best evidence that a change can be reversed?
  • A.The material goes back to how it was when it is cooled or warmed again
  • B.The change happened quickly
  • C.The material looks nice afterward
6.Which change in the record could NOT be reversed?
  • A.Butter melting
  • B.Bread turning to toast
  • C.Chocolate melting
7.Toast stayed toast when it cooled. What would a student say about toasting?
  • A.It undoes itself overnight
  • B.It is the same as melting
  • C.It is a change that cannot be undone

LessonPrint · 2-PS1-4 · Set 12 · free to copy for classroom use

Answer key — Heated, Then Cooled Again

Set 12. Prints on its own sheet.

  1. 1.1. The toast stayed toast when it cooled, but the chocolate went hard again. 2. It would go back to solid, like the chocolate went hard again. 3. It melted, then went hard again. 4. Some changes caused by heating can be reversed and some cannot.
  2. 2.Cooking an egg is a change that cannot be reversed
  3. 3.So the heating is the same and only the material is different
  4. 4.The water came back, so boiling it can be reversed
  5. 5.The material goes back to how it was when it is cooled or warmed again
  6. 6.Bread turning to toast
  7. 7.It is a change that cannot be undone

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