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.
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.
Important Questions on Sorting Materials into Groups
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.
_____ is not soluble in water.
_____ floats on water.
Choose an appropriate word and fill in the blank.
A material which cannot be easily compressed or scratched is called _____. (hard material/soft material)
