Grade 3 (Age 9) Science Worksheet — Materials & Mixtures: Solid/Solid, Solid/Liquid & Separation Methods | 40 Objective, 20 Short Answer, 10 Problem Solving (Cambridge-aligned)

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Science Worksheet

Instructions

Read each question carefully and write your answer in the space provided. Try your best to answer all the questions. Good luck!

Part 1: Objective Questions

A. Circle the correct answer for each question.

  1. What state of matter has a fixed shape and does not flow?
    a) Liquid     b) Solid     c) Gas
  2. Which of these is an example of a liquid?
    a) A rock     b) Milk     c) A pencil
  3. When you mix two or more things together, you make a...
    a) Solid     b) Liquid     c) Mixture
  4. What do you call a mixture of sand and water?
    a) Solid/Solid     b) Solid/Liquid     c) Liquid/Liquid
  5. Which method is best to separate large stones from rice?
    a) Filtering     b) Sieving     c) Hand-picking
  6. When salt dissolves completely in water, it forms a...
    a) Solution     b) Sieve     c) Solid
  7. To separate sand from water, you should use...
    a) Evaporation     b) A magnet     c) Filtration
  8. What happens to sugar when you stir it in warm water?
    a) It sinks     b) It dissolves     c) It floats
  9. Which tool has small holes to let smaller particles pass through?
    a) A funnel     b) A sieve     c) A magnet
  10. Iron filings can be separated from sand using a...
    a) Filter paper     b) Magnet     c) Sieve
  11. Evaporation is used to separate a ________ solid from a liquid.
    a) Soluble     b) Insoluble     c) Large
  12. Which of these is insoluble in water (does not dissolve)?
    a) Sugar     b) Salt     c) Sand
  13. Which of these is soluble in water (does dissolve)?
    a) Pebbles     b) Flour     c) Sugar
  14. A mixture of small pebbles and large seashells is a...
    a) Solid/Liquid mixture     b) Solid/Solid mixture     c) Solution
  15. In a saltwater solution, the salt is called the...
    a) Solute     b) Insoluble solid     c) Sieve

B. Write 'True' or 'False' for each statement.

  1. A wooden chair is a solid. __________
  2. Orange juice is a solid. __________
  3. You can separate salt from water by using a sieve. __________
  4. Sand dissolves in water to make a clear solution. __________
  5. A magnet can be used to pick up steel paper clips. __________
  6. Hand-picking is a good method for separating sugar and salt. __________
  7. Filtration is used to separate two liquids. __________
  8. When water evaporates, it turns into water vapour (a gas). __________
  9. A bowl of mixed nuts is a solid/solid mixture. __________
  10. All solid materials can dissolve in water. __________
  11. A sieve works because it has tiny holes. __________
  12. A solution is a special type of mixture. __________
  13. You can usually see through a clear solution. __________
  14. Pebbles are usually larger than grains of sand. __________
  15. Oil and water mix together to form a solution. __________

C. Fill in the blanks with the correct word from the box below.

magnetism     evaporate     filtration     solution     hand-picking
soluble     sieve     insoluble     shape     liquid
  1. A substance that can dissolve in a liquid is called ____________________.
  2. The separation method that uses a magnet is called ____________________.
  3. Water is a type of ____________________.
  4. When we separate mud from water using filter paper, it is called ____________________.
  5. To get salt from salt water, you must let the water ____________________.
  6. A mixture of flour and rice can be separated using a ____________________.
  7. A solid that does not dissolve in a liquid is ____________________.
  8. A brick has a fixed ____________________.
  9. Picking large buttons out of a jar of small beads is an example of ____________________.
  10. Sugar mixed in tea creates a sweet ____________________.

Part 2: Short Answer Questions

Write a short answer for each question.

  1. What is a solid? Give one example.
  2. What is a liquid? Give one example.
  3. What is a mixture?
  4. Give an example of a solid/solid mixture.
  5. Give an example of a solid/liquid mixture.
  6. What does the word "soluble" mean?
  7. What does the word "insoluble" mean?
  8. Name one solid that is soluble in water.
  9. Name one solid that is insoluble in water.
  10. What is a solution?
  11. Describe the hand-picking method for separation.
  12. When would you use a sieve to separate a mixture?
  13. What is filtration used for?
  14. How does evaporation help separate a dissolved solid from a liquid?
  15. What tool would you use to separate iron nails from wood shavings?
  16. You have a mixture of large pasta shells and tiny sugar crystals. What is the best separation method to use?
  17. Why can't you use filter paper to separate dissolved salt from water?
  18. If you stir mud in a glass of water and the mud settles at the bottom, is the mud soluble or insoluble?
  19. What state of matter does water become when it evaporates?
  20. Why is a salad considered a mixture?

Part 3: Problem Solving

Read the scenarios and answer the questions that follow.

  1. You are baking and accidentally spill some iron staples into a bag of flour.

    a) What kind of mixture is this (staples and flour)? ____________________

    b) What is the best and quickest way to separate them? ____________________

    c) What tool will you need? ____________________

  2. Your younger sister mixed sand with small pebbles in a bucket at the beach.

    a) What kind of mixture is this? ____________________

    b) How can you separate the pebbles from the sand? ____________________

  3. You have a beaker of salt water that also has some sand at the bottom. You want to get pure, dry salt.

    a) What is the first step to remove the sand? ____________________

    b) After the sand is gone, what is the final step to get the salt from the water? ____________________

  4. You made a pot of lemonade from a powder, but not all the powder dissolved. There are little bits floating in the lemonade.

    a) Is the leftover powder soluble or insoluble? ____________________

    b) What method could you use to get the bits out and make the lemonade clear? ____________________

  5. A chef has a big box of rice, but there are some small, dark lentils mixed in. The chef needs to remove them.

    a) What separation method should the chef use if the lentils are big enough to see? ____________________

    b) Why is this method a good choice? ____________________

  6. You have a glass of water with small pieces of chalk powder at the bottom.

    a) Is this mixture a solution? Why or why not? ____________________

    b) What is the best method to separate the chalk from the water? ____________________

  7. A bag of popcorn kernels has some unpopped kernels and some popped popcorn. You only want to eat the popped popcorn.

    a) What separation method would work well? ____________________

    b) Explain why it works. ____________________

  8. You have a mixture of sugar and sand. You want to separate them.

    a) What liquid could you add to the mixture to dissolve one of the solids? ____________________

    b) After adding the liquid, what two separation steps would you need to do? ____________________

  9. A glass contains coffee grounds at the bottom of a cup of hot water.

    What is the method used in coffee machines to prevent this from happening? ____________________

  10. Imagine a diagram showing a funnel with a paper cone inside it. Sandy water is being poured in. Clear water drips out the bottom, and sand is left on the paper.

    What is this separation method called? ____________________

Answer Key

Part 1: Objective Questions

A. Multiple Choice

  1. b) Solid
  2. b) Milk
  3. c) Mixture
  4. b) Solid/Liquid
  5. c) Hand-picking
  6. a) Solution
  7. c) Filtration
  8. b) It dissolves
  9. b) A sieve
  10. b) Magnet
  11. a) Soluble
  12. c) Sand
  13. c) Sugar
  14. b) Solid/Solid mixture
  15. a) Solute

B. True or False

  1. True
  2. False
  3. False
  4. False
  5. True
  6. False
  7. False
  8. True
  9. True
  10. False
  11. True
  12. True
  13. True
  14. True
  15. False

C. Fill in the Blanks

  1. soluble
  2. magnetism
  3. liquid
  4. filtration
  5. evaporate
  6. sieve
  7. insoluble
  8. shape
  9. hand-picking
  10. solution

Part 2: Short Answer Questions

  1. A solid is a state of matter that keeps its own shape. Example: a rock, a book, a table.
  2. A liquid is a state of matter that flows and takes the shape of its container. Example: water, juice, oil.
  3. A mixture is two or more substances mixed together that are not chemically joined.
  4. Example: Sand and pebbles, salt and pepper, nuts and bolts.
  5. Example: Sand and water, salt and water.
  6. Soluble means able to dissolve in a liquid.
  7. Insoluble means not able to dissolve in a liquid.
  8. Salt or sugar.
  9. Sand or pebbles.
  10. A solution is a special mixture where a solid has dissolved completely in a liquid.
  11. It is separating parts of a mixture by hand. It is used when the pieces are large enough to see and pick up.
  12. You would use a sieve to separate solids of different sizes, like sand from pebbles.
  13. Filtration is used to separate an insoluble solid from a liquid.
  14. The liquid turns into a gas and disappears, leaving the dissolved solid behind.
  15. A magnet.
  16. Sieving (the tiny sugar would fall through the holes, leaving the pasta).
  17. Because the salt particles are so small they have dissolved and will pass through the filter paper with the water.
  18. The mud is insoluble.
  19. A gas (water vapour).
  20. Because it is made of different ingredients (lettuce, tomatoes, etc.) that are mixed together but are not chemically changed.

Part 3: Problem Solving

  1. a) Solid/Solid mixture. b) Using a magnet / Magnetism. c) A magnet.
  2. a) Solid/Solid mixture. b) Sieving (the sand will fall through the sieve, leaving the pebbles).
  3. a) Filtration (to remove the sand). b) Evaporation (to remove the water and leave the salt).
  4. a) Insoluble. b) Filtration.
  5. a) Hand-picking. b) The lentils are a different colour and large enough to be picked out easily.
  6. a) No, because the chalk has not dissolved. It is an insoluble solid in a liquid. b) Filtration.
  7. a) Sieving or hand-picking. b) A sieve would work if the holes are big enough for unpopped kernels but too small for the popped popcorn.
  8. a) Water. b) First, filtration to separate the sand. Second, evaporation to get the sugar back from the water.
  9. Filtration (a coffee filter is used).
  10. Filtration.
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