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2nd grade · Science · Unit 2 of 7

Solids & Liquids

Melting, freezing and steam

What your child practices

Sorting solids and liquids, describing melting, freezing and boiling, and changes that can or can't be undone.

Arizona Academic Standards learning standard: 2.P1U1.2 · how heating or cooling changes a substance between solid and liquid

How we explain it

Children can open this short lesson before they practice.

  1. A solid keeps its shape, like a spoon or an ice cube.
  2. A liquid flows and takes the shape of its container, like juice.
  3. Warming melts solids into liquids. Cooling freezes liquids into solids.

Example: What happens to water in the freezer? The freezer is very cold. Cold turns liquid water into a solid. Answer: it freezes into ice

Solids & Liquids in Arizona

In the Arizona Academic Standards, this is unit 2 of 7 in 2nd grade Science, after Changing Materials and before Water World.

Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.

Source: Arizona Department of Education

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

    What do we call the process of a liquid becoming a solid when it gets cold?

    • boiling
    • melting
    • freezing

  2. Question 2

    Where would you find water as a gas?

    • 🧊an ice cube
    • 🍲steam rising from hot soup
    • 🏞️a river

  3. Question 3

    Which change can be undone?

    • 🔥burning wood
    • 🧊melting ice
    • 🍪baking cookies

  4. Question 4

    Which one is a gas?

    • 🧃orange juice
    • ✏️a pencil
    • 🌬️the air we breathe

  5. Question 5

    Is it a solid or a liquid? Tap an item, then tap its basket.

    Sort into: 🧱 solid · 💧 liquid

    • 🍯honey
    • 🧃juice
    • 🧊ice cube
    • 🍎apple
    • 💧water
    • 🥄spoon

  6. Question 6

    Which one is a solid?

    • ♨️steam
    • 🪵a wooden block
    • 🧃orange juice

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