Chemistry In Everyday Life Online Test 6th Science Lesson 15 Questions in English

Materials are subjected to have physical or chemical changes. Chemical changes of a material result in change of the substance.

Turmeric is found to be a natural indicator. The color change indicates the acidic or the base nature of a material.

The Physical changes in a material change the shape, size or volume and the state of a material. Boiling an egg is a chemical change as a new substance is formed and the process is irreversible.

There are lots of studies that involved in Human evolution and understanding the substances around us. In that chemistry deals with the detailed study of various particles around human beings.

The presence of chemical Propanethial s-oxide in onion gives irritation and tears in Human eyes. While cutting the onion the cells are damaged and the chemical changes into vapor and comes out. This causes irritation and tears in eyes.

In some food batters fermentation process is carried out by the bacteria present in it. These cause some chemical changes and make them soft and tastier.

Soaps are made by Lye (or) Sodium Hydroxide (or) Caustic soda with Coconut oil and water. Different soaps are prepared with different raw materials for various purposes.

Soaps are salts made by combining an Alkali with fats or fatty acids. KOH is used to manufacture soft soaps which are useful for bathing.

Sunlight, Air and Water are needed for the growth of the plants. Apart from these some nutrients are also needed which are got from the soil. Nitrogen, Phosphorous and Potassium are three important nutrients which are called as Principal Nutrients.

Fertilizers are classified as Organic and Inorganic based on the materials they use and the process by which they are made.

Organic fertilizers are plants and animals based materials synthesized by microorganisms. They are also economical. Inorganic fertilizers are made in factories by chemical process. Urea , Ammonium Sulphate are some of the Inorganic fertilizers.

Earthworms take organic wastes as their food and produce compost castings. This compost is used to improve soil health.

Cement becomes hard when water is added to it. Gypsum is used to control the rate of hardening of cement. Gypsum is added at the final process.

Mortar is a cement paste which is used to bind the building blocks. Concrete mixture is used to construct bridges and dams. Reinforced cement is a composite material which has iron mesh and cement mix.

In 1824, Joseph Aspdin invented Portland cement by burning finely ground chalk and clay in kiln. It was also named as Portland cement.

Concrete is a mixture of Cement, Sand and Gravel. It is used in the construction of buildings, Dams and Bridges.

Gypsum is a soft white grey naturally available material. The chemical name of gypsum is Calcium Sulphate Dihydrate.

The Chemical name of Gypsum is Calcium Sulphate Dihydrate. The molecular formula of gypsum is CaSo4.2H2O.

Epsom salts is also called as Magnesium Sulphate Hydrate. Used for various purposes. It is used for stress reliever and for body relaxation. Also used as a medicine for skin problems.

Plaster of Paris which is named as it is found near Paris, France. It is prepared from the Gypsum. The Uses of plaster of Paris are in setting of fractured bones in surgeries for making casts for statues and toys.

Phenol is a carbolic acid which is used for the cleaning purposes and as a disinfectant.

Phenol is a weak acid. It is a volatile white crystalline powder. It is a colorless solution.

Phenol is basically a colorless solution which changes to Red color if any dust particles present in it.

Phenol is used in low concentrations in mouthwash and as a disinfectant for floor cleaning. As it kills the microorganisms it is also used as Surgical Antiseptic.

Adhesives are a paste like substance which is commonly known as Glue, mucilage or paste.

Adhesives are a paste like substance which is commonly known as Glue, mucilage or paste.

Natural adhesives are made from starch and artificial adhesives are made from chemicals.

Natural adhesives are made from starch and artificial adhesives are made from chemicals.

Artificial adhesives are made from chemicals. They are classified in various ways depending on their utilities. They have various forms like paste, liquid, film, pellets and tape.

The diluted form of phenol is mostly used as a disinfectant in household cleaners and also in mouthwash liquids.

Pressure increases the adhesive capacity at both of the surfaces for binding. This proper pressure ensures the binding correctly.

Sunlight, Air and water are needed for the growth of the plant. Apart from these some nutrients from the soil is also essential for the growth of the plants.

A basic form of soap is made by mixing the fats or fatty acids with salts along with the water. Water is used to dissolve the salt content with the oil to begin the saponification process. Later some of the water evaporates and makes the soap harder.

The Nature of the soap varies according to the constituents present in it.

Inorganic fertilizers are prepared by using natural elements to undergo some chemical changes in factories. Urea, Ammonium Sulphate, Sodium Nitrate and Super phosphate are some of the inorganic fertilizers.

The cement is manufactured by crushing of naturally occurring minerals like lime, clay and gypsum through milling process.

Gypsum plays a vital role in controlling the rate of hardening of the cement. A small amount of gypsum is added to the final grinding process to control the setting of the cement.

The chemical name for gypsum is calcium sulphate dihydrate(Caso4.2H2O)
Epsom salt is Magnesium sulphate dihydrate (Mgso4.7H2O)
Plaster of Paris is calcium sulphate hemihydrate (Caso4.1/2 H2O)
Phenol molecular formula is C6H5OH.

Phenol is a carbolic acid of an organic compound. It is a volatile weak acid.

Cement is manufactured by crushing the natural minerals like Lime, Clay and Gypsum through milling process.

Chemists identify turmeric powder as a ‘natural indicator’. The change in color indicates that the material is either acid or base medium.

Fertilizers given to plants can be classified into two. They are organic and inorganic fertilizers.

Cement is used as mortar, concrete and reinforced cement concrete.

Earthworms are known as Farmers’ friends because of the multitude of services they provide to improve soil health and consequently plant health.

Reinforced cement concrete is a composite material by mixing iron mesh with cement. This is very strong and firm. It is used in the construction of dams, bridges, centering works in houses and construction of pillars. Huge water tanks, water pipes and drainages are built with this.