Tiêu đề 6th - CHEMISTRY.pdf ✅

2 38 - 79 LANGUAGE OF CHEMISTRY 3 80 - 144 4 CLASS - VI NAME OF THE TOPIC CHEMISTRY 145 - 173 1 BASICS OF CHEMISTRY 01 - 37 ATOMIC STRUCTURE NATURE OF MATTER 6 3 8 5 HYDROGEN AND OTHER NON METALS AIR AND ITS CONSTITUENTS 7 WATER AND ITS CONSTITUENTS CHANGES AROUND US 174 - 204 205 - 229 230 - 277 278 - 319

1 11 Synopsis - 1 Introduction to Matter: The whole universe is composed of Matter and Energy The matter and energy are inter convertible. Matter: Anything that occupies space, has weight and which has the principle of inertia is called Matter. Inertia: Fundamental property of matter by virtue of which a body resists to change its original position. Matter is made up of tiny particles called Molecules. Molecules in turn are made up of “Atoms”. The molecules are so small that they are not visible to our naked eye. Molecules of matter are constantly moving. The arrangement of molecules is different in different states of matter. Matter is available in three states : Depending upon the temperature at which it is maintained, the three forms of matter are Solids, Liquids and Gases. Solids The molecules of a solid are closely packed together with little empty space between them. The molecules in a solid cannot move freely. They are held together tightly to give a definite shape and volume to the solid. MATTER
222M22 Solids exist in different forms like granules (salt), powder (coffee), hard rock, soft chalk, rubber, glass (transparent) etc. Solid Liquids The molecules of a liquid are loosely packed. They have more space between them and they can move freely. So they can flow. They do not have a definite shape of their own. They acquire the shape of the container. Liquid Gases The molecules of gases have large space between them. They can move freely and independently. Gases have no definite shape, but they have weight. We smell the fragrance of flowers, perfumes, coffee, etc., because the gas molecules spread easily. Gas Solution The space between the molecules of a liquid is called intermolecular space. When some substances are added to a liquid, the molecules of these substances occupy the intermolecular spaces of a liquid. Then the substance is said to be dissolved in the liquid. Dissolving a material in a liquid, often produces no change in volume. wat er molecules sugar molecule Empt y spaces bet ween wat er molecules Sugar molecules fill up empt y spaces VI - Chemistry