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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 22 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 happened to the chocolate?
2.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
3.Water turned to steam, and drops formed on the lid. What does that show?
  • A.The water was destroyed
  • B.The water came back, so boiling it can be reversed
  • C.Lids make water
4.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.Eggs are always solid
  • C.Cooling undoes every change
5.A student says "heating always changes things for good." Which result shows that is wrong?
  • A.The chocolate went hard again when it cooled
  • B.The egg turned solid
  • C.The bread turned to toast
6.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
7.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

LessonPrint · 2-PS1-4 · Set 22 · free to copy for classroom use

Answer key — Heated, Then Cooled Again

Set 22. 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 melted, then went hard again.
  2. 2.Both changes could be reversed by cooling
  3. 3.The water came back, so boiling it can be reversed
  4. 4.Cooking an egg is a change that cannot be reversed
  5. 5.The chocolate went hard again when it cooled
  6. 6.It is a change that cannot be undone
  7. 7.Let it cool and see if it goes hard again

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