If you want to buy gold, what would be the first thing you ask the goldsmith? Won’t it be about the purity of the gold? But how would you know if a substance is pure or not? Scientifically, pure substances are the ones which thoroughly are made up of a single element. The mixture, on …
Try this. Take a part of a brick and hammer it continuously, until all that is left is a red powder-like substance. The powder-like substance still has minute particles in it. These particles are called ‘Atoms’. Every substance is made up of Atoms. Along with the Atoms, substances are composed of smaller units called ‘Molecules’. …
We have already learnt about natural fibres in our previous classes. In this chapter, we take a detailed look on synthetic fibres i.e man-made fibre cloth. Synthetic fibres are created by chemically processing natural fibre. Some of the examples of synthetic fibres are rayon, nylon, polyester, and acrylic. Also, we will learn some important factors …
What if we tell you Mercury is a metal? Baffled? Don’t be. In this chapter, we take you through the amazing facts about metals and non-metals. We will learn about their properties, know if they are good conductors of heat and electricity, and learn about their uses. Also, we will put up some interesting facts …
Will a car or bike start without having petrol in it? It is impossible. Petrol is one of the precious resources that we need. Most vehicles in the present times run on this fuel. Petrol is obtained from petroleum, which is extracted from deep insides of the Earth. Another important resource that we find in …
One of the best ways to light a fire is by using a matchstick. What would happen if you keep a matchstick in the open air? Will it start to burn all by itself? No right! But why is this so? Well, all flammable substances have specific ignition temperature. After reaching that point, a substance …
Due to the increasing amount of carbon dioxide emissions and deforestations, Global warming has today become a reality for all of us. Increasing population demands large spaces. For this reason, forests have been changed to concrete jungles. The ascending number of vehicles releasing hazardous gases has polluted the atmosphere. But all of these can be …
Don’t some questions leave your mind baffled? Why does lime juice taste sour and not sweet? Why does soap powder give out bubbles? Do you know that the mixture of lime juice and soap water produces salt and water? In this chapter, we take you through the definitions of Acids and Bases. Here, you will …
Everything that is present our environment goes through some kind of a change. Some changes are permanent, while some are temporary. For example – Water when freezes below 0° C, changes to ice, but turns back to water when heated. This change is temporary and physical. On the other hand, an iron rod when exposed …
Different types of cloth fabrics are available in the market. From cosy wool to the glossy silk, there are a variety of materials available. The warmth of woollen clothes is very comforting, while silk sarees never go out of style. But have you ever wondered where do we get these fabrics from? Well, we get …
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