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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 24 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 would happen to a melted ice cube left in a freezer?
  2. 2. What happened to the bread?
  3. 3. What was kept the same in this test?
  4. 4. Why is toast different from melted chocolate?
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.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
4.Wax melts in a warm dish. What test would show whether the change can be reversed?
  • A.Smell it
  • B.Heat it more
  • C.Let it cool and see if it goes hard again
5.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
6.Which is the best evidence that a change can be reversed?
  • A.The change happened quickly
  • B.The material goes back to how it was when it is cooled or warmed again
  • C.The material looks nice afterward
7.Water turned to steam, and drops formed on the lid. What does that show?
  • A.Lids make water
  • B.The water was destroyed
  • C.The water came back, so boiling it can be reversed

LessonPrint · 2-PS1-4 · Set 24 · free to copy for classroom use

Answer key — Heated, Then Cooled Again

Set 24. Prints on its own sheet.

  1. 1.1. It would go back to solid, like the chocolate went hard again. 2. It turned to toast, and it stayed toast. 3. All the things were heated on the same plate. 4. The toast stayed toast when it cooled, but the chocolate went hard again.
  2. 2.The chocolate went hard again when it cooled
  3. 3.It is a change that cannot be undone
  4. 4.Let it cool and see if it goes hard again
  5. 5.Both changes could be reversed by cooling
  6. 6.The material goes back to how it was when it is cooled or warmed again
  7. 7.The water came back, so boiling it can be reversed

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