Aim: To name some materials that can be used to make specified objects
Material required: a pencil
Procedure: Think of different materials from which the objects listed below can be made.
Observation: Fill in the correct information in the following table.
S. No.
Objects
Materials which can be used to make the object
1.
Utensils
2.
Table/chair
3.
Flooring
4.
Almirah
Conclusion: Thus we find that different materials can be used for making an object.
Material required: a pencil
Procedure: Think of different materials from which the objects listed below can be made.
Observation: Fill in the correct information in the following table.
Important Questions on Sorting Materials into Groups
Aim: To classify on the basis of the states of matter
Material required: a pencil
Procedure: Study the list of objects given below and classify them on the basis of their state.
air, lemonade, hydrogen, common salt, petrol, talcum powder,
orange juice, oxygen, book, nitrogen, pencil, kerosene
Observation: Complete the table.
| Solid | Liquid | Gas |
Conclusion: Objects around us can be in the solid, liquid or gaseous state.
Aim: To classify objects into natural and man-made ones
Material required: a pencil
Procedure: Classify the objects named below into two groups—natural objects and man-made objects.
Silver, coal, plastics, cotton, cement, soap, gold, bangles
Observation: Complete the table.
| Natural objects | Man-made objects |
Conclusion: Some objects around us are natural, while others are man-made.
Aim: To classify materials on the basis of their solubility
Materials required: a beaker, water, stirrer, a little quantity of the following items—milk, sand. wax, sugar, washing soda, common salt, plastic, glass, coconut oil, paper
Procedure: Put a little quantity of the substances, one at a time, mentioned in the table in a beaker containing water. Use a stirrer to stir. Use fresh water every time to check the solubility of the substance.
Observation: Now, classify the materials on the basis of their solubility in water.
| S. No. | Materials | Soluble in water |
| 1. | milk | yes |
| 2. | sand | no |
| 3. | wax | |
| 4. | sugar | |
| 5. | washing soda | |
| 6. | common salt | |
| 7. | plastic | |
| 8. | glass | |
| 9. | coconut oil | |
| 10. | paper |
Conclusion: We can classify substances on the basis of their solubility in water.
Aim: To test for floatation of substances in water
Materials required: a beaker half-filled with water, an iron nail, a dry leaf, a cork, a coin, a plastic ruler, a small stone, an ice cube
Procedure: Collect different materials such as an iron nail, a dry leaf, a cork, a coin and a plastic ruler. Take a beaker half-filled with water. Now drop the objects into the beaker one by one.
Observation: What do you find? Record your observations in the table given below.
| S. No. | Materials | Floats on water | Sinks in water |
| 1. | an iron nail | ||
| 2. | a dry leaf | ||
| 3. | a cork | ||
| 4. | a coin | ||
| 5. | a plastic ruler |
Conclusion: We observe that some materials float on water, while others sink in it.
_____ is hard and has lustre.
