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Grade 6 Ch 6 Materials Around Us

             Grade 6 Chapter 6: Materials Around Us    1. Introduction to Materials and Objects Material:   Any substance used to create an object . Examples include paper, wood, cloth, glass, metal, plastic, and clay. Object:   A thing made from one or more materials. Objects around us vary in shape, colour, and texture. Key Principles: An object can be made from a single material or a combination of different materials (e.g., a pen made of plastic, metal, and ink). A single material can be used to make many different objects (e.g., wood can be used to make chairs, tables, and doors). The choice of material for an object depends on the material’s properties and the object’s intended purpose. For example, a tumbler must be made of a material that can hold water, making materials like cloth or paper unsuitable. 2. Grouping and Classification of Mat...
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Grade 8 Ch 7 Particulate Nature of Matter

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  CH 7 PARTICULATE NATURE OF MATTER Introduction Matter exists in different forms: solids, liquids, gases. Questions to think: Why can we pile sand but not water? How does air give weight to a balloon? 7.1 What is Matter Composed of? Chalk experiment : breaking into smaller pieces → shows matter is made of small constituent particles. A Constituent particle is the basic unit that makes up a larger piece of a substance or material. Sugar in water : dissolves, not seen but tasted → proves particles exist and mix. The spaces between the particles are known as Interparticle space . Matter is composed of extremely small particles . Particles cannot be seen even with ordinary microscope. Interparticle spaces : sugar particles fill gaps between water particles. 7.2 What Decides Different States of Matter? The constituent particles of matter are held together through forces which are attractive in nature, these f...
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