Acids, Bases and Salts Acids: Acids are substances that taste sour and can be harmful. They turn blue litmus paper to red. Examples include orange juice, vinegar, and hydrochloric acid. They are chemically acidic. Bases: Bases are substances that feel slippery and taste bitter when dissolved in water. They turn red litmus paper to blue. … Read more
Reproduction in Animals | Class 8 Science | Chapter 9 Reproduction means making babies or offspring. It’s very important for keeping a species alive. There are two ways animals and plants reproduce: Sexual Reproduction: This involves two parents, a male and a female. They have special parts that make tiny cells called gametes. These gametes … Read more
Conservation of Plants and Animals Class 8 Notes Extinction Extinction is when a species is completely wiped out from the Earth. Once the last living individual of a species dies, the species is said to be extinct. Deforestation Deforestation is the destruction of forests by cutting down trees. Deforestation leads to habitat loss for many … Read more
Is Matter Around Us Pure Matter and Particle Arrangement: Matter is composed of particles arranged in a specific way. Gases have well-separated particles that can move freely, while solids have tightly packed particles with limited mobility. Pure Substances: Pure substances are either elements or compounds. They consist of only one kind of entity and have … Read more
Combustion and Flame Combustion: A chemical process where a substance reacts with oxygen, releasing heat and light. Example: burning wood. Combustible and Non-Combustible Substances: Combustible substances easily catch fire (e.g., paper, coal), while non-combustible substances don’t readily catch fire (e.g., sand, water). Fuel: Substances that, upon combustion, produce usable energy. Fuels can be solid, liquid, … Read more
Atoms and Molecules In the fascinating world of chemistry, the study of atoms and molecules forms the foundation of our understanding of matter and its transformations. Several fundamental laws and theories govern the behavior of these tiny particles, unraveling the mysteries of the composition and behavior of elements and compounds. Law of Conservation of Mass: … Read more
Heat Heat is a form of energy that makes things feel hot or warm. When something is hot, it has a lot of heat energy, and when something is cold, it has less heat energy. Heat can move from a hot object to a cooler object, and this transfer of energy is what makes things … Read more
Fibre to Fabric Fibres from Plants Plant fibres are essential materials made from cellulose found in plants. These fibres are commonly used to create paper and cloth, and they can be long and shiny when prepared correctly. Some well-known plant fibres are cotton, jute, flax, and hemp. Jute is obtained solely from the stem of jute … Read more
Matter In Our Surroundings | Class 9 Matter refers to anything that has mass and occupies space. It includes substances like hydrogen, oxygen, sugar, sand, air, and water, which are made up of tiny particles with space between them. Matter can exist in three states: solid, liquid, and gas. The classification is based on interparticle … Read more
Sorting Materials into Groups In science, materials can be sorted into various groups based on different properties and characteristics. Here are some common ways to sort materials into groups for a class 6 science lesson: Natural and Artificial Materials: Natural materials: These are substances that occur in nature without human intervention, such as wood, … Read more
