Introduction In our day -to- day life, we need to separate substances from a mixture of materials. For example, tea leaves are separated from the liquid with a strainer. Grain is separated from stalks, while harvesting. Before cooking rice, impurities such as husk, stone etc. are separated from it. There are many other processes used …
In 1800 only 31 elements were known. By 1865 the number of elements identified were more than 63. At present 118 elements are known. With such a large number of elements, it is very difficult to study each element individually. To make it easy scientists proposed a systematic way to organise the elements. Content Why …
Class 11 Chapter 3 Classification of elements and periodicity in properties Read More »
The existence of atoms was proposed since 400 B.C. approximately. According to the early Indian and Greek philosophers atoms are the fundamental particle of matter. ‘Atom’ is derived from the Greek word a-tomio which means not divisible further. In 1808 the atomic theory was propounded by John Dalton, which described the law of conservation of …
Class XI Chapter 1 Some Basic Concepts of Chemistry Chemistry is the scientific study of the properties and behaviour of matter. It is the science of molecules and their transformation. It is an important part of our life. The formation of curd from milk, rusting of iron, and the formation of vinegar from sugarcane juice …
CLASS 11 Chapter 1 Some Basic Concepts of Chemistry Read More »
Introduction • Food is a basic requirement for all living organisms because it provides energy for carrying out various physical activities. • Food contains components needed by our body. These components are called nutrients. • Our food mainly contains five types of nutrients namely vitamins, minerals, carbohydrates, proteins and fats. Apart from this food also …
Introduction Any substance that human beings, animals or plants eat to nourish their body for proper growth and maintenance is called food. • All living beings require food. • Food is required by all living beings for four main purposes: 1. for proper growth. 2. to provide energy for doing work. 3. for the repair …
CLASS 6 Chapter 1 Food: Where does it come from? Read More »
Introduction The clothes that we wear are made of different materials. Some clothes are soft, some are silky etc. The bedsheets, blankets, curtains, tablecloths, towels etc. all are made from different kinds of fabric. Also, we wear different types of clothes in different seasons.
Introduction Every object around us has different shapes, colours and uses. Whether food, clothes, chair, utensils, books, toys, water, stones, cycle any many more. All these objects can be grouped together on the basis of their properties such as appearance, shape, texture, features, characteristics etc.
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Introduction Amongst the three states of matter, liquid and gases are called fluids because of their ability to flow. But solid cannot flow. The reason for this is that the particles in a solid are not free to move in available space. There is a strong intermolecular force of attraction in between the particles in …
