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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 8 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 claim does this record support?
  2. 2. Why is toast different from melted chocolate?
  3. 3. What happened to the bread?
  4. 4. What would happen to a melted ice cube left in a freezer?
2.A student says "heating always changes things for good." Which result shows that is wrong?
  • A.The egg turned solid
  • B.The chocolate went hard again when it cooled
  • C.The bread turned to toast
3.Wax melts in a warm dish. What test would show whether the change can be reversed?
  • A.Smell it
  • B.Let it cool and see if it goes hard again
  • C.Heat it more
4.Why heat every material on the same plate?
  • A.So it is quicker
  • B.So it is tidier
  • C.So the heating is the same and only the material is different
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.Neither changed at all
  • C.Both were burnt
6.An egg turned solid when heated and stayed solid when cooled. What does that show?
  • A.Eggs are always solid
  • B.Cooling undoes every change
  • C.Cooking an egg is a change that cannot be reversed
7.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

LessonPrint · 2-PS1-4 · Set 8 · free to copy for classroom use

Answer key — Heated, Then Cooled Again

Set 8. Prints on its own sheet.

  1. 1.1. Some changes caused by heating can be reversed and some cannot. 2. The toast stayed toast when it cooled, but the chocolate went hard again. 3. It turned to toast, and it stayed toast. 4. It would go back to solid, like the chocolate went hard again.
  2. 2.The chocolate went hard again when it cooled
  3. 3.Let it cool and see if it goes hard again
  4. 4.So the heating is the same and only the material is different
  5. 5.Both changes could be reversed by cooling
  6. 6.Cooking an egg is a change that cannot be reversed
  7. 7.The material goes back to how it was when it is cooled or warmed again

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