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Grade 9 Conservation of Mass Worksheet with Answers

Grade 9 (US) · Year 10 (UK) · Class 9 (India) · Chemistry

Unit 4: Chemical ReactionsReactions & Conservation of MassNGSS HS-PS1-7

In mixing, dissolving and reactions in a closed system, total mass stays the same. This free high 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 9 · Chemistry

Score___ / 12

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Learning goal: Reactions & Conservation of Mass · NGSS HS-PS1-7

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

Example

A 52 g ice cube melts completely in a sealed bag. What is the mass of the water?

Answer: 52 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

    In a sealed container, 37 g of one substance reacts with 35 g of another. What is the total mass of the products?

  2. 2

    A 12 g ice cube melts completely in a sealed bag. What is the mass of the water?

  3. 3

    50 g of salt is dissolved in 32 g of water. What is the mass of the salt water?

  4. 4

    14 g of salt is dissolved in 110 g of water. What is the mass of the salt water?

  5. 5

    In a sealed container, 50 g of one substance reacts with 11 g of another. What is the total mass of the products?

  6. 6

    In a sealed container, 47 g of one substance reacts with 31 g of another. What is the total mass of the products?

  7. 7

    A 14 g ice cube melts completely in a sealed bag. What is the mass of the water?

  8. 8

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

  9. 9

    A 21 g ice cube melts completely in a sealed bag. What is the mass of the water?

  10. 10

    In a sealed container, 8 g of one substance reacts with 20 g of another. What is the total mass of the products?

  11. 11

    In a sealed container, 35 g of one substance reacts with 21 g of another. What is the total mass of the products?

  12. 12

    59 g of salt is dissolved in 28 g of water. What is the mass of the salt water?

★ Challenge corner for fast finishers

Why does your breath make fog on a cold window?

How did I do?

Teacher's comments

Free printable worksheets with answer keys · aethelsystems.com/worksheets/chemistry/9/conservation_mass

Answer key (click to show)
  1. 1.72 g
  2. 2.12 g
  3. 3.82 g
  4. 4.124 g
  5. 5.61 g
  6. 6.78 g
  7. 7.14 g
  8. 8.69 g
  9. 9.21 g
  10. 10.28 g
  11. 11.56 g
  12. 12.87 g
  13. ★water vapor in your breath condenses on the cold glass (challenge corner)

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