5.6B— Explaining Properties of Mixtures

Practice questions

1. 1

   A student mixes iron filings and sand. What happens to the iron filings?

   • They still respond to a magnet.
   • They turn into sand.
   • They disappear.
   • They become water.
2. 2

   A student says, 'The sand disappeared after it was mixed with water.' What is wrong with that idea?

   • The sand changed into water.
   • The water turned into sand.
   • The mixture became a solution.
   • The sand is still there, even if it sinks.
3. 3

   Which pair is a mixture where the parts can still keep their own properties?

   • Salt water
   • Sugar water
   • Iron filings and sand
   • Milk and chocolate syrup
4. 4

   A class records these mixtures: 1. iron filings and sand 2. salt water 3. trail mix Which one shows the best way to remove one part with a magnet?

   • Both salt water and trail mix
   • Salt water
   • Trail mix
   • Iron filings and sand
5. 5

   How would you explain why a sieve can separate some mixtures?

   • Because heavier pieces always turn into new substances.
   • Because larger pieces stay on the sieve.
   • Because all substances dissolve in water.
   • Because magnets remove every kind of material.
6. 6

   A jar has sand and water. Which action would help separate the sand from the water?

   • Add more sand until it disappears.
   • Use a magnet on the jar.
   • Let the sand settle, then pour off the water.
   • Freeze the mixture forever.
7. 7

   Which statement best matches a trail mix mixture?

   • The ingredients always dissolve in water.
   • The ingredients change into one new substance.
   • The ingredients keep their own properties.
   • The ingredients disappear when mixed.
8. 8

   A student mixes iron filings, sand, and water. Which tool could remove the iron filings first?

   • A clock
   • A ruler
   • A magnet
   • A sponge
9. 9

   Look at these two mixtures: A: iron filings and sand B: salt water Which statement is true?

   • A is a mixture, and B is a solution.
   • A is a solution, and B is a mixture.
   • Both A and B are the same kind of mixture.
   • Both A and B are solutions.
10. 10

    A student writes: 'If a substance sinks, it is gone.' Which choice corrects that idea?

    • If a substance sinks, it is gone forever.
    • If a substance sinks, it has become a gas.
    • If a substance sinks, it may still be in the mixture.
    • If a substance sinks, it always dissolves.
11. 11

    Which method would best separate rice grains from larger beans in a mixed container?

    • A magnet
    • A freezer
    • A sieve
    • Evaporation
12. 12

    A teacher says, 'Salt water is a mixture because the salt stays visible as separate grains.' What is the best response?

    • That is incorrect because salt turns into sand.
    • That is correct because salt water is a mixture with visible salt grains.
    • That is incorrect because the salt dissolves evenly in water.
    • That is correct because all liquids are mixtures.
13. 13

    A class compares two mixtures. Mixture 1: iron filings and sand Mixture 2: sand and water Which tool would work on Mixture 1 but not on Mixture 2?

    • A notebook
    • A spoon
    • A towel
    • A magnet
14. 14

    A student mixes two substances. One substance seems to disappear, but it is still present in the liquid. What does that describe?

    • A solid only
    • A solution
    • A magnet
    • A rock
15. 15

    Which explanation best shows why salt and sand can be separated after mixing them?

    • The sand dissolves in water, but the salt stays solid.
    • The salt and sand both disappear when they are mixed.
    • The salt changes into sand when water is added.
    • The sand stays sand, and the salt can dissolve and be separated.
16. 16

    A student wants to separate a mixture of iron filings and sand, then separate the sand from water. Which order makes the most sense?

    • Use a sieve first, then add more sand.
    • Use a magnet first, then settle or pour off the water.
    • Use evaporation first, then use a magnet.
    • Stir harder until both mixtures disappear.
17. 17

    A student says, 'Trail mix is a solution because it has many parts.' What is the best correction?

    • Trail mix is not matter.
    • Trail mix is a mixture because the parts stay separate.
    • Trail mix becomes one new substance.
    • Trail mix is a solution because all foods dissolve.
18. 18

    Data table: Mixture A: iron filings and sand Mixture B: salt water Which mixture can be separated with a magnet?

    • Mixture A
    • Neither mixture
    • Both mixtures
    • Mixture B
19. 19

    A student mixes sand and water, waits, and then sees the sand at the bottom. Which sentence best explains this?

    • The sand is still there and settled down.
    • The sand turned into water.
    • The sand disappeared into the air.
    • The water became a magnet.
20. 20

    Which choice best compares a mixture and a solution?

    • A mixture and a solution are always exactly the same.
    • A mixture keeps parts separate; a solution has one substance dissolved in another.
    • A solution means the liquid has no substance in it.
    • A mixture has parts that always dissolve; a solution never does.