Changes in Matter
What happens when an ice cube melts?
It changes from a solid to a liquid.
What happens when water in a bowl dries up in the sun?
The heat evaporates the water into a gas
In an experiment, cardboard held 55 blocks and paper held 25. Which was stronger?
Cardboard
Give one example of a change in matter that can be reversed.
Ice melting/freezing again.
What can you do with small blocks or linking cubes to create new things?
Disassemble and rearrange them to make new structures
Which change cannot be reversed: ice melting, soda freezing, or an egg boiling?
An egg boiling
Popsicles and plastic toys have what in common?
Both are made from materials that melt
Why was it easier to make plastic blocks than wooden blocks?
Plastic can be melted and poured into many copies
Give one example of a change in matter that cannot be reversed.
Boiling an egg.
Explain why rearranging blocks shows how matter can be used in different ways.
Small pieces can be taken apart and put together again to form new structures
Sara’s ice cubes melted in the sun. How can she reverse this change?
Put the melted water back in the freezer
Name one example of each: a solid, a liquid, and a gas.
Ex: Solid = rock, Liquid = juice, Gas = air.
Which property makes metal pots better for cooking than plastic bowls?
Metal can handle heat without melting.
Why do we put food in the refrigerator or freezer?
To slow down changes like melting, spoiling, or bacterial growth.
If you build a tower with blocks and it falls, what kind of change is that—reversible or irreversible?
Reversible, because you can rebuild the tower.
Why is freezing water a reversible change, but cooking an egg is not?
Freezing can be undone (water melts again), but cooking an egg makes a permanent change.
How do gases act differently from solids and liquids?
Gases spread out and fill all the space available, while solids and liquids keep their shape/volume.
Name one material that is waterproof and one that is not.
Waterproof = plastic; Not waterproof = paper.
Which is an example of evaporation you see every day?
Water drying on clothes or on the ground after rain.
Why are Legos or linking cubes a good way to understand matter and structures?
They show how small parts can combine to make bigger things, just like matter makes objects.
Give an example of a change in matter you see at school or home that cannot be reversed.
Examples: burning paper, baking cookies, boiling an egg.
Explain what happens to water when it goes from a solid to a liquid to a gas.
Ice melts into liquid water, then heat evaporates it into gas (water vapor).
Explain how the properties of materials help us choose what to use for building (like glass for windows or wood for furniture).
Different materials are chosen because of their strength, flexibility, durability, or transparency.
Explain how knowing about changes in matter helps us in cooking or cleaning.
Cooking uses heat to change food permanently; cleaning uses water/soap to dissolve or remove materials.
Write or explain how scientists and engineers use the idea of disassembling and rearranging materials in real life.
They recycle, design, and invent by taking materials apart and reusing them to make new things.