Combustion and Flame Class 8 Notes

CBSE Class 8 Chapter 6 notes – Combustion and Flames

Combustion is a chemical process in which a substance reacts with oxygen and liberates heat. Substances that undergo combustion are said to be combustible. Sometimes, during combustion light is given off as flames or a glow. Oxygen in the air is essential for combustion. The lowest temperature at which a combustible substance catches fire is known as the ignition temperature. The substances with low ignition temperature and can easily catch fire are known as inflammable substances. Alcohol, petrol and diesel are a few examples of inflammable substances. While extinguishing a hazardous fire, water is poured on the fire because water cools the temperature of combustible material below ignition temperature. Although, we cannot control a fire involving electrical equipment and gas. Please refer Combustion and Flame Class 8 Notes for more revision notes.

Coal and Petroleum Class 8 Notes

Coal and Petroleum Class 8 Notes – Chapter 5

Around 300 million years ago, the dense forest in wetland areas was buried under the soil due to flooding. They were compressed, as more and more soil deposited over them. Under high pressure and temperature, the dead plants were converted to coal.

The other exhaustible natural resource petroleum was formed from the organisms living under the sea. As the organisms living under the sea died and settled at the bottom of the sea, they were covered with layers of clay and sand. These dead organisms with layers of sand and clay transformed into petroleum and natural gas under high pressure and temperature. Please refer Coal and Petroleum Class 8 Notes for more revision notes.

Materials: Metals and Non-Metals Class 8 Notes

Materials Metals and Non-metals Class 8 Notes – Chapter 4

Everything around us is categorized into either metals or non-metals. Hence, it is important to know what non-metals and metals are and how to distinguish them. The class 8 science chapter 4 discusses the various physical and chemical properties of metals and non-metals. To help you with it, here we list a few physical and chemical properties of metals and non-metals. Please refer Materials: Metals and Non-Metals Class 8 Notes for more revision notes.

Synthetic Fibres and Plastics Class 8 Notes

CBSE Class 8 Science Chapter 3 Notes: Synthetic Fibres And Plastics

Clothes that we wear on a daily basis are made of fabrics. Fabrics are made of fibres which are obtained from natural and artificial sources. Wool, silk, and cotton are a few examples of natural fibres and fibres like polyesters and terylene are a few examples of synthetic fibres. In class 8 science chapter 3, the various types of synthetic fibres along with their characteristics are mentioned. Please refer Synthetic Fibres and Plastics Class 8 Notes for more revision notes.

Microorganisms: Friend and Foe Class 8 Notes

CBSE Class 8 Science Chapter 2 Notes: Microorganisms

If you observe a drop of water from the pond through a microscope, you will see a lot of tiny rounded structures. These tiny creatures are known as microbes or microorganisms. They are all around us and are so small in size that they cannot be seen with bare human eyes. Please refer Microorganisms: Friend and Foe Class 8 Notes for more revision notes.

Crop Production and Management Class 8 Notes

CBSE Class 8 Science Chapter 1 Notes – Crop Production And Management

Till 10,000 B.C.E human beings led a nomadic life, wandering in groups from place to place in search of food and shelter. Later, as the population grew they found methods to cultivate land and produce rice, vegetables, and other food crops. Thus, ‘Agriculture’ emerged. To provide food for a large population — regular production, proper management, and distribution is of vital importance. A series of activities are undertaken by farmers over a period of time for the cultivation of crops. These tasks or activities are known as agricultural practices. Please refer Crop Production and Management Class 8 Notes for more revision notes.

Class 8 Science Notes

CBSE Class 8 Science Notes

CBSE curriculum of Class 8 Science Notes aims at helping students develop an understanding and evaluation of several basic concepts of physics, chemistry, and biology. Due to the vastness of syllabus, most of the students find it cumbersome to study chapters directly from the textbooks prescribed by their school. Most of the time students blindly read the entire topic without understanding a single word. Instead of that, if the students are preparing any concept from properly and precisely designed study notes then their brain will basically understand the conceptual meaning of each and every sentence quite effectively.

Introduction to Graphs Class 8 Notes

Introduction To Graphs Class 8 Notes- Chapter 15

Graphical methods used to present data is very efficient in organizing the data and understand them. There are various graphical methods which are mentioned below:

  • While comparing among categories, the method which is appropriate is the bar graph.
  • While comparing parts of a whole, pie-chart is the ideal method.
  • When data is provided in intervals, a histogram can be used for easier understanding.
  • In the case of the data changing continuously over a period of time, a line graph will be useful
  • When an unbroken line is represented, it is done with the help of a linear graph. Please refer Introduction to Graphs Class 8 Notes for more revision notes.
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