This cheat sheet covers matter and materials for Grade 2 and Grade 3 science. Students learn that matter is anything that takes up space and can be described in simple ways. It helps children tell the difference between solids, liquids, and gases.
It also gives clear words for describing what objects are made of and how materials can change.
The most important ideas are that matter has properties, materials can be sorted, and some changes can be reversed while others cannot. Solids keep their shape, liquids flow and take the shape of a container, and gases spread out. Materials have properties such as hard, soft, rough, smooth, waterproof, bendy, or see-through.
These ideas help students observe, compare, and explain everyday objects like paper, wood, metal, glass, water, and air.
Key Facts
- Matter is anything that takes up space, such as a rock, water, air, a pencil, or a balloon.
- A solid keeps its own shape, so a book stays book-shaped when it is moved.
- A liquid flows and takes the shape of its container, so water looks different in a cup and in a bowl.
- A gas spreads out to fill space, so air fills a balloon or a room.
- A material is what an object is made from, such as wood, metal, plastic, glass, fabric, or paper.
- A property describes a material, such as hard, soft, rough, smooth, shiny, dull, bendy, stiff, waterproof, or absorbent.
- Materials can be sorted by their properties, such as putting waterproof objects in one group and absorbent objects in another group.
- Some changes are reversible, such as melting ice and freezing water, while some changes are not easy to reverse, such as tearing paper.
Vocabulary
- Matter
- Matter is anything that takes up space and can be seen, touched, or felt in some way.
- Solid
- A solid is a kind of matter that keeps its own shape.
- Liquid
- A liquid is a kind of matter that flows and takes the shape of its container.
- Gas
- A gas is a kind of matter that spreads out and can fill empty space.
- Material
- A material is the substance an object is made from, such as wood, metal, plastic, or cloth.
- Property
- A property is a way to describe matter or a material, such as hard, soft, smooth, rough, or waterproof.
Common Mistakes to Avoid
- Thinking air is not matter is wrong because air takes up space, such as inside a balloon.
- Calling all clear things glass is wrong because some clear objects are plastic, water, or other materials.
- Saying a liquid has no shape is not quite right because a liquid takes the shape of its container.
- Sorting objects only by color can be misleading because scientists often sort materials by properties like hard, soft, waterproof, or absorbent.
- Thinking every change is permanent is wrong because some changes can be reversed, such as water freezing into ice and ice melting back into water.
Practice Questions
- 1 Name the state of matter for each item: ice cube, orange juice, and air in a balloon.
- 2 You have 3 objects: a metal spoon, a paper towel, and a rubber band. Which one is bendy, which one is absorbent, and which one is shiny?
- 3 A cup has 200 mL of water. The water is poured into a bowl. How much water is in the bowl, and what changed?
- 4 A raincoat is made from waterproof material. Explain why waterproof is a useful property for a raincoat.