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1. Unit I : Matter Lesson 1: Group and Store M aterials According to their Properties

2. Density is the amount of matter an object has. All matter is made up of very small particles called molecules . Some matter have tightly packed molecules. This means they are denser and thus, tend to sink .

3. Buoyancy It is the upward force exerted by any liquid against the weight of an object immersed in it. Buoyant force (B f ) > or = Object FLOAT Buoyant force ( B f ) < Object SINK

4. Some materials easily absorb or take in water. Sponges that are natural or man-mad can absorb water. Where can you used sponge?

5. Some Materials and their Properties Metal are hard and strong. They can be molded or bent into different shapes. Aside from being flexible, some metals are ductile. This means they can be drawn into fine wires. They are very good conductors of heat and electricity . Give at least three example of metal. .

6. Plastics are man-made materials that have a lot of useful properties. This is why they often used in place of other materials. They also do not break easily and are used in place of glass or ceramics. What happen do you think that entails?

7. Wood tough and strong. It does not rust. It can also resist heat and good construction material. Give at least three products made of wood.

8. Glass it is transparent and shiny. It often break easily. It is use in the laboratory, like test tubes and beakers, are resistant to heat and do not easily break. Give at least 3 examples of useful things made of glass.

9. Rubber is a material that comes from the sap of the rubber tree. It may also made from chemicals. Rubber is elastic and can be stretched. It can hold air and keep moisture out. It can also be used as an insulator. What are some objects that are made of rubber?

10. Ceramic Ceramics consist mostly of clay and the minerals feldspar and quartz. They are resistant to acids, salts and detergent. Objects we use in dinnerware and for display at home are made of ceramics. Give three objects made of ceramics.

11. Paper made from wood pulp. It is absorbent and can be used for wiping wet surfaces. It can be recycled from old news papers, magazines and printed materials. What are some things that can be made from recycled paper?

12. Storing Household Materials Sort the materials according to their use and have a proper storage place for each kind of material. Put all the medicines in a medicine cabinet. be sure all the containers have product label. Place all biodegradable materials, which can be used in composting as well as non-biodegradable materials. Store boxes, glass, and other plastic container so you can reuse or recycle them.