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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 3 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 claim does this record support?
  2. 2. Why did the open jar lose mass when the sealed one did not?
  3. 3. What was the mass after sugar was stirred into water?
  4. 4. What happened to the mass in every sealed container?
2.Sugar dissolves and the mass is unchanged. What does that suggest about the sugar?
  • A.It has been destroyed
  • B.It became water
  • C.It is still there, spread through the water
3.A pupil concludes matter disappears because an open jar lost mass. What is wrong?
  • A.Open jars destroy matter
  • B.Nothing is wrong
  • C.The gas left the jar but not the world; the sealed jar shows it
4.An open jar of vinegar and soda loses 3.5 g. Where did it go?
  • A.It turned into heat
  • B.It was destroyed
  • C.Gas escaped into the room
5.Ice melts in a sealed bag. What should the mass do?
  • A.Rise, because water is heavier
  • B.Stay exactly the same
  • C.Fall, because liquid is lighter

LessonPrint · 5-PS1-2 · Set 3 · free to copy for classroom use

Answer key — Weighed Before, Weighed After

Set 3. Prints on its own sheet.

  1. 1.1. The total mass of matter stays the same through a change, when nothing can escape. 2. Gas escaped from the open jar, and the sealed jar kept it inside. 3. 254.0 g, the same as before. 4. It stayed exactly the same before and after.
  2. 2.It is still there, spread through the water
  3. 3.The gas left the jar but not the world; the sealed jar shows it
  4. 4.Gas escaped into the room
  5. 5.Stay exactly the same

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.