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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 18 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.

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 the open jar?
  2. 2. Why did the open jar lose mass when the sealed one did not?
  3. 3. What happened to the mass in every sealed container?
  4. 4. What claim does this record support?
2.A sealed jar of vinegar and soda weighs the same before and after fizzing. What does that show?
  • A.Matter was destroyed
  • B.No matter was lost; the gas is still inside the jar
  • C.The balance was wrong
3.An open jar of vinegar and soda loses 3.5 g. Where did it go?
  • A.It turned into heat
  • B.Gas escaped into the room
  • C.It was destroyed
4.Why is the sealed jar the fair test of conservation?
  • A.Sealed jars are heavier
  • B.Open jars are inaccurate
  • C.Nothing can leave, so the balance measures all the matter
5.Why use the same balance for every reading?
  • A.So a difference between readings is a real difference in mass
  • B.Balances are all identical
  • C.To save time

LessonPrint · 5-PS1-2 · Set 18 · free to copy for classroom use

Answer key — Weighed Before, Weighed After

Set 18. Prints on its own sheet.

  1. 1.1. It fell from 201.3 g to 197.8 g. 2. Gas escaped from the open jar, and the sealed jar kept it inside. 3. It stayed exactly the same before and after. 4. The total mass of matter stays the same through a change, when nothing can escape.
  2. 2.No matter was lost; the gas is still inside the jar
  3. 3.Gas escaped into the room
  4. 4.Nothing can leave, so the balance measures all the matter
  5. 5.So a difference between readings is a real difference in mass

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.