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5th grade · Science · Unit 1 of 12

Solutions & Mixtures

Dissolving and separating mixtures

What your child practices

Solutions versus mechanical mixtures, solutes and solvents, what affects dissolving, and ways to separate mixtures (filtering, evaporation, magnets, chromatography).

Oregon State Standards learning standard: 5.PS1.3; 5.PS1.4 · identifying materials by their properties and testing whether mixing makes new substances

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    How can you get pure water back from salt water? Put the steps in order.

    • ❄️The vapor touches a cold surface and condenses
    • 🔥Heat the salt water
    • ♨️Water evaporates and the salt stays behind
    • 💧Drops of pure water drip into a clean cup

  2. Question 2

    What pattern does this table show?

    Sugar that dissolves in 100 mL of water (about)
    Water temperatureSugar dissolved
    20 °C200 g
    40 °C240 g
    60 °C290 g
    80 °C360 g
    • temperature doesn't change how much dissolves
    • the warmer the water, the less sugar dissolves
    • the warmer the water, the more sugar dissolves
    • sugar dissolves only in cold water

  3. Question 3

    Which tool would separate iron filings from sand?

    🧲
    • a magnet
    • a filter
    • a thermometer
    • a measuring cup

  4. Question 4

    Soluble or insoluble in water? Tap an item, then tap its basket.

    Sort into: 💧 soluble · 🚫 insoluble

    • 🍬sugar
    • 🍯honey
    • 🍚uncooked rice
    • 🧂table salt
    • 🪨pebbles
    • 🏖️sand

  5. Question 5

    A sieve separates the parts of a mixture by their…

    • size
    • temperature
    • color
    • magnetism

  6. Question 6

    A dot of black marker on wet paper spreads out into several colors. What is this separation method called?

    🖊️
    • chromatography
    • sieving
    • filtration
    • evaporation

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