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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 9 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 claim does this record support?
  2. 2. What was the mass after sugar was stirred into water?
  3. 3. Why did the open jar lose mass when the sealed one did not?
  4. 4. What happened to the mass in every sealed container?
2.Why is the sealed jar the fair test of conservation?
  • A.Nothing can leave, so the balance measures all the matter
  • B.Sealed jars are heavier
  • C.Open jars are inaccurate
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.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
5.Ice melts in a sealed bag. What should the mass do?
  • A.Stay exactly the same
  • B.Fall, because liquid is lighter
  • C.Rise, because water is heavier

LessonPrint · 5-PS1-2 · Set 9 · free to copy for classroom use

Answer key — Weighed Before, Weighed After

Set 9. Prints on its own sheet.

  1. 1.1. The total mass of matter stays the same through a change, when nothing can escape. 2. 254.0 g, the same as before. 3. Gas escaped from the open jar, and the sealed jar kept it inside. 4. It stayed exactly the same before and after.
  2. 2.Nothing can leave, so the balance measures all the matter
  3. 3.Mass before against mass after, for each sealed change
  4. 4.No matter was lost; the gas is still inside the jar
  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.