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Weighed Before, Weighed After is a free printable Grade 5 science worksheet on measuring to show the total weight of matter is conserved, aligned to Common Core standard 5-PS1-2. It prints 5 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 16 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.

Weighed Before, Weighed After

5-PS1-2

NameDate

Read the record, then answer the questions.

1.Read the record, then answer the questions.

Weighed Before and Weighed After

Masses recorded on the same balance, before and after four changes. MASS BEFORE AND AFTER Sugar stirred into water, sealed jar ... 254.0 g then 254.0 g Ice melted in a sealed bag ............ 118.6 g then 118.6 g Vinegar and soda in a SEALED jar ...... 201.3 g then 201.3 g Vinegar and soda in an OPEN jar ....... 201.3 g then 197.8 g The same balance was used for every reading.

  1. 1. What happened to the mass in every sealed container?
  2. 2. Why did the open jar lose mass when the sealed one did not?
  3. 3. What happened to the mass in the open jar?
  4. 4. What claim does this record support?
2.A pupil concludes matter disappears because an open jar lost mass. What is wrong?
  • A.Nothing is wrong
  • B.The gas left the jar but not the world; the sealed jar shows it
  • C.Open jars destroy matter
3.What would you graph to show conservation across several changes?
  • A.The colour of each mixture
  • B.The time taken
  • C.Mass before against mass after, for each sealed change
4.Ice melts in a sealed bag. What should the mass do?
  • A.Fall, because liquid is lighter
  • B.Stay exactly the same
  • C.Rise, because water is heavier
5.An open jar of vinegar and soda loses 3.5 g. Where did it go?
  • A.Gas escaped into the room
  • B.It turned into heat
  • C.It was destroyed

LessonPrint · 5-PS1-2 · Set 16 · free to copy for classroom use

Answer key — Weighed Before, Weighed After

Set 16. Prints on its own sheet.

  1. 1.1. It stayed exactly the same before and after. 2. Gas escaped from the open jar, and the sealed jar kept it inside. 3. It fell from 201.3 g to 197.8 g. 4. The total mass of matter stays the same through a change, when nothing can escape.
  2. 2.The gas left the jar but not the world; the sealed jar shows it
  3. 3.Mass before against mass after, for each sealed change
  4. 4.Stay exactly the same
  5. 5.Gas escaped into the room

More practice for 5-PS1-2

Measure and graph to show that weight is conserved when matter changes.

Teaching this next? Weighed Before, Weighed After is the 60-minute plan for it, with the misconceptions to expect.

All Grade 5 worksheets

Last reviewed 2026-09-05. Aligned to 5-PS1-2 of the Next Generation Science Standards.