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Grade 8 Conservation of Mass Worksheet with Answers

Grade 8 (US) · Year 9 (UK) · Class 8 (India) · Science

Unit 1: Matter & Chemical ReactionsConservation of MassNGSS MS-PS1-5

In mixing, dissolving and reactions in a closed system, total mass stays the same. This free middle school worksheet has 12 questions and a full answer key. Print it or save it as a PDF — every answer is checked by code, not guessed.

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Conservation of Mass

Grade 8 · Science

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Learning goal: Conservation of Mass · NGSS MS-PS1-5

Directions: Read each question carefully and write your answer on the line.

Example

5 g of salt is dissolved in 108 g of water. What is the mass of the salt water?

Answer: 113 g

RememberConservation of mass

Before: 50 g + 20 g= 70 greactionAfter: products= 70 gMass is never created or destroyed: total mass before = total mass after.
  1. 1

    A 16 g ice cube melts completely in a sealed bag. What is the mass of the water?

  2. 2

    A 46 g ice cube melts completely in a sealed bag. What is the mass of the water?

  3. 3

    9 g of salt is dissolved in 24 g of water. What is the mass of the salt water?

  4. 4

    In a sealed container, 22 g of one substance reacts with 27 g of another. What is the total mass of the products?

  5. 5

    A 57 g ice cube melts completely in a sealed bag. What is the mass of the water?

  6. 6

    A 50 g ice cube melts completely in a sealed bag. What is the mass of the water?

  7. 7

    A 45 g ice cube melts completely in a sealed bag. What is the mass of the water?

  8. 8

    36 g of salt is dissolved in 68 g of water. What is the mass of the salt water?

  9. 9

    In a sealed container, 45 g of one substance reacts with 14 g of another. What is the total mass of the products?

  10. 10

    In a sealed container, 44 g of one substance reacts with 60 g of another. What is the total mass of the products?

  11. 11

    56 g of salt is dissolved in 34 g of water. What is the mass of the salt water?

  12. 12

    26 g of salt is dissolved in 108 g of water. What is the mass of the salt water?

★ Challenge corner for fast finishers

Why does a spinning ice skater spin faster when she pulls her arms in?

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Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/science/8/conservation_mass

Answer key (click to show)
  1. 1.16 g
  2. 2.46 g
  3. 3.33 g
  4. 4.49 g
  5. 5.57 g
  6. 6.50 g
  7. 7.45 g
  8. 8.104 g
  9. 9.59 g
  10. 10.104 g
  11. 11.90 g
  12. 12.134 g
  13. ★conservation of angular momentum (challenge corner)

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