Samacheer Class 6 Science - Chemistry in Everyday Life

False. – Low concentrated Phenol is used as a disinfectant.
False – Epsum is largely used in medical industry.
True.
False – Adhesives are substances that are used to join two (or) more components.
True

Cover your work area with old newspaper.
Take the necessary quantity of water in a jar.
Add concentrated sodium hydroxide in the jar and allow it to cool.
Then add coconut oil drop by drop and stir it well.
Pour that solution into an empty matchbox, soap can be obtained after drying.
Try this soap to wash your handkerchief.

Phenol properties:
It is a weak acid.
It is a volatile, white crystalline powder.
It is a colourless solution but changes into the red in the presence of dust.

Earthworms take organic wastes as food and produce compost castings.
They provide a multitude of services to improve soil health and consequently plant health.
So earthworm is called a farmer’s friend.

Manufacture of Detergents:
Materials used:
Acid slurry, Soda ash (or) Sodium Carbonate, Trisodium phosphate (TSP), sodium tripolyphosphate (STPP), Carboxy Methyl Chloride (or) Cellulose, Glauber’s salt, colour perfume and brightner.
Preparation:
Acid slurry is first neutralised.
Then neutralised Acid Slurry is mixed with Soda ash and kept for one hour for completion of reaction.
Other ingredients such as Trisodium phosphate (TSP), Sodium tripolyphosphate (STPP), Carboxy Methyl Chloride (or) Cellulose, Glauber’s salt, colour, perfume, brightner are then blended to the neutralised Acid Slurry with continuous mixing.
Then the mixture is dried.
Now we get detergent powder.

Make a pit of 30 cm or take a wooden box.
Place a thin net on the base of the pit or wooden box.
Fill it with sand for about 1-2 cm.
Spread some plant wastes (like a dry leaf, flower) and biodegradable wastes on it.
Sprinkle some water.
Add some earthworms to these substances and cover them with an old cloth or dried coconut leaf.
We can find that vermicompost is formed after four weeks.
Use this vermicompost as manure for plants and conserve soil fertility.
Advantages of using vermicompost:
Vermicompost is an excellent organic manure for sustainable agro-practices.
Vermicompost is rich in essential plant nutrients.
In improves soil structure texture, aeration, and water holding capacity and prevents soil erosion.
Vermicompost is rich in nutrients and an eco-friendly amendment to the soil for farming and terrace gardening.
It enhances seed germination and ensures good plant growth.
Vermicompost can be prepared easily.

The detergent molecules have two sides.
One side water-loving and other water-hating molecules.
Water hating goes and joins with dirt and oil in the cloth while the water-loving joins with the water molecules.
When you agitate the cloth, the dirt is surrounded by many molecules and taken away from the cloth.
The dirt surrounded by the detergent molecules floats in the water making it dirty.
Finally, the cloth is clean.