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Back Again, or Not is a free printable Grade 2 science worksheet on changes from heating and cooling that reverse and that do not, aligned to Common Core standard 2-PS1-4. It prints 3 questions with an answer key on its own sheet of paper, in 25 versions that each ask different questions, so no two pupils in the class work from the same page. Print it from the browser or download it as a PDF — no account, no email.

Set 10 of 25 · the same problems every time you open this link.

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One paper per pupil

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Set 1 has all 25 in a single PDF. All 25 sets ask different questions.

Back Again, or Not

2-PS1-4

NameDate

Sort each change into the right group.

1.Sort each one: Can be changed back or Cannot be changed back?

Sort: Chocolate melted, then cooled, Water boiled into steam under a lid, Bread toasted, Milk left until it curdles

Can be changed backCannot be changed back
2.Sort each one: Can be changed back or Cannot be changed back?

Sort: Ice cream left out and refrozen, Water frozen into ice, An egg cooked hard, Clay fired in a kiln

Can be changed backCannot be changed back
3.Sort each one: Can be changed back or Cannot be changed back?

Sort: Wood burnt to ash, Wax melted in a warm dish, Butter melted in a pan, A cake baked from batter

Can be changed backCannot be changed back

LessonPrint · 2-PS1-4 · Set 10 · free to copy for classroom use

Answer key — Back Again, or Not

Set 10. Prints on its own sheet.

  1. 1.1. Bread toasted — Cannot be changed back 2. Chocolate melted, then cooled — Can be changed back 3. Milk left until it curdles — Cannot be changed back 4. Water boiled into steam under a lid — Can be changed back
  2. 2.1. An egg cooked hard — Cannot be changed back 2. Clay fired in a kiln — Cannot be changed back 3. Ice cream left out and refrozen — Can be changed back 4. Water frozen into ice — Can be changed back
  3. 3.1. A cake baked from batter — Cannot be changed back 2. Butter melted in a pan — Can be changed back 3. Wax melted in a warm dish — Can be changed back 4. Wood burnt to ash — Cannot be changed back

More practice for 2-PS1-4

Argue with evidence that some changes from heating or cooling undo and some do not.

Teaching this next? Back Again, or Not is the 50-minute plan for it, with the misconceptions to expect.

All Grade 2 worksheets

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