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C. Matter and Energy · Properties of Liquids and Solids

Properties of Liquids and Solids: Unit Review

C1.1 C1.2 C2.1 C2.2 C2.3 C2.4 C2.5 C2.6 C2.7 A1.1 A1.2 A1.3 A1.4 A1.5 A2.1 A3.1 A3.3About 40 minutes
Learning goals
  • I can describe the properties of solids and liquids and how they change state.
  • I can explain mixtures, floating and sinking, and absorbing and repelling water.
  • I can read safety symbols and suggest safe ways to use, store and get rid of household products.

Words to know

solid
Matter that keeps its own shape.
liquid
Matter that flows and takes the shape of its container.
melt / freeze
Change from solid to liquid / from liquid to solid.
dissolve
When a solid mixes into a liquid so you cannot see it.
buoyancy
The upward push of water on an object.
absorb / repel
Soak up water / push water away.
hazard symbol
A picture that warns about danger, like poison or flammable.

Let's review!

You have learned a lot about liquids and solids. This review has a few questions from every lesson in the unit. Try each one, then press Show answer to check. If a part feels tricky, go back to that lesson and do its activity again.

Does it keepits own shape?It is a SOLID.Does it flow and take theshape of its container?It is a LIQUID.yesnoyes(even tiny grains likerice and sand)
Use these two detective questions to sort any material into solid or liquid.

Solids and Liquids All Around Us

1

Sort these into solids and liquids: a pine cone, apple juice, a brick, rain.

2

Is a river part of the natural environment or the built environment?

3

Name a liquid found in the built environment.

Properties of Solids and Liquids

1

Name two properties of liquids.

2

Salt can be poured. Is it a solid or a liquid? Explain.

3

You pour 250 mL of water from a tall glass into a wide bowl. How much water is in the bowl?

Liquid Water and Solid Water

1

At what temperature does water freeze?

2

Does ice float or sink in water?

3

Why might a full plastic water bottle bulge in the freezer?

Melting, Freezing, and Staying the Same

1

Name a solid that melts when heated, other than ice.

2

Will milk in the fridge freeze? Why?

3

Can melted chocolate become solid again? How?

4

Why does a wool sock help keep an ice cube frozen?

How Melting and Freezing Affect People and Nature

1

Name one helpful and one harmful impact of water freezing.

2

Why do winter roads in northern Ontario close in spring?

3

How can too much road salt harm the environment?

Mixing Liquids and Solids

1

Which dissolve in water: sugar, sand, salt, rice?

2

What happens when you mix oil and water?

3

Name a useful mixture of a solid and a liquid.

4

Why must you never mix cleaning products?

Float or Sink?

1

Sort into floaters and sinkers: cork, key, wooden block, coin.

2

A ball of clay sinks. How can you make the same clay float?

3

Why does a big log float but a small pebble sink?

Soak It Up or Keep It Out

1

Does a paper towel absorb or repel water?

2

What does a water drop look like on wax paper?

3

Which material would you choose for a tent: cotton balls or water-repellent fabric? Why?

Safety Symbols on Products

1

What does a flame symbol mean?

2

What does an octagon shape around a symbol mean?

3

What are the 3 steps when you see a hazard symbol?

Using, Storing, and Getting Rid of Products Safely

1

Why is it unsafe to put cleaner in a juice bottle?

2

Where should leftover paint go?

3

Where can old medicine go?

melt / freezeheat or cool itdissolveseems to disappearfloat / sinktop or bottomabsorb / repelsoak in or bead up
Four big science ideas from this unit. Can you explain each picture to someone at home?
Knock knock

Knock knock.

Who's there?

Ice cream.

Ice cream who?

Ice cream every time I see a hazard symbol: "STOP! Don't touch!"

How to use this review

  • Do the review in two short sittings if your child gets tired. Each section matches one lesson.
  • Use real things while answering: a glass of water, an ice cube, a bowl of water to float things in.
  • Ask "How do you know?" after each answer. Good reasons use science words: keeps its shape, flows, melt, freeze, dissolve, float, absorb, repel.
  • Note which section had mistakes and revisit that lesson's activity.
Check your understanding

Quiz

1.

Which one is a liquid?

2.

Sand can be poured, but it is a solid because...

3.

Water freezes into ice at...

4.

Which will stay the same in a warm kitchen?

5.

Why can a water pipe burst in very cold weather?

6.

What happens to sugar when you stir it into water?

7.

Which object floats?

8.

Which material repels water?

9.

A skull and crossbones symbol means...

10.

Which is the safest way to store a cleaner?

For parents and teachers

Use mistakes to choose what to revisit. Each review section matches one lesson.

  • Can't sort solids and liquids, or mixes up natural and built: revisit Solids and Liquids All Around Us and repeat the solid and liquid hunt.
  • Thinks sand is a liquid, or thinks water is "less" in a wide bowl: revisit Properties of Solids and Liquids and redo the pouring test and liquid race.
  • Unsure what makes ice melt or water freeze, or about 0°C: revisit Liquid Water and Solid Water and the freezer cup investigation.
  • Thinks everything melts at the same temperature, or that the fridge freezes things: revisit Melting, Freezing, and Staying the Same and the ice cube keeper.
  • Can't name helpful and harmful impacts of melting and freezing: revisit How Melting and Freezing Affect People and Nature and make the community chart.
  • Mixes up dissolving and melting, or doesn't know the mixing safety rules: revisit Mixing Liquids and Solids and the mixing lab.
  • Thinks big things always sink: revisit Float or Sink? and the clay and foil boat challenges.
  • Mixes up absorb and repel: revisit Soak It Up or Keep It Out and the drop test.
  • Can't read hazard symbols or forgets the stop-leave-tell rule: revisit Safety Symbols on Products.
  • Can't suggest safe storage or disposal: revisit Using, Storing, and Getting Rid of Products Safely and the home safety inspection.

A few mistakes are normal. Praise careful observing, fair tests and good reasons that use science words.