This PSEB 6th Class Science Notes Chapter 4 Sorting Materials into Groups will help you in revision during exams.
PSEB 6th Class Science Notes Chapter 4 Sorting Materials into Groups
→ The matter is defined as anything that has mass and takes up space.
→ All material around us is matters because all materials occupy space and have mass.
→ Feelings of love or sadness, signals received by radio and television, different forms of energy do not matter.
→ Some of these substances are made up of one material whereas others are made up of more than one material.
→ Atom is the smallest part that is found in all types of matter.
→ We are surrounded by different substances having different shapes, sizes, colours, and uses.
→ Some articles can be made from different materials. There are certain different articles that are made up of the same materials.
→ Due to the large variety of objects, it is better if we classify these. We can classify these different bases i.e. shape, the material used, use, etc.
→ Objects made from one material have simple composition. Objects made from many materials have complex compositions.
→ Materials are used to make objects depending upon their properties and the purpose for which the objects are to be used.
→ Some materials have similar and some have dissimilar properties.
→ Some substances completely disappear when dissolved in water. These are called soluble substances.
→ Substances that do not mix with water or do not disappear in water even after stirring for a long time are called insoluble substances.
→ Some materials have a shining appearance. These are called lustrous.
→ The substances which have a dull appearance are called non-lustrous substances.
→ Some materials are hard. These are called rigid substances.
→ We can see across certain substances these are called transparent substances.
→ We cannot see across certain substances. These are called opaque substances.
→ We can see only up to a certain extent across some substances. These are called translucent substances.
→ Liquids that completely mix with each other are called miscible liquids.
→ Liquids that do not mix with each other are called immiscible liquids.
→ Liquids that partially mix with each other are called partially miscible liquids.
→ The mass per unit volume of a substance is known as density.
→ If an insoluble substance has a density higher than water then it will sink.
→ If an insoluble substance has a density lower than water then it will float.
→ Out of a pair of immiscible liquids, the one with the higher density will form the lower layer and the one with the lower density will form the upper layer.
→ Miscible: The liquids which mix completely are called miscible liquids.
→ Immiscible: The liquids which do not mix with each other are called miscible liquids.
→ Soluble: The solid substance that on dissolving in water or any other liquid completely disappear is called a soluble substance.
→ Insoluble: The solid substance that on dissolving in water or any other liquid that does not disappear is called an insoluble substance.
→ Transparent: The substances through which one can see, are called transparent.
→ Opaque: The substances through which one cannot see are called opaque.
→ Translucent: The substances through which one can see partially but not clearly, are called translucent.
→ Lustre: The shining that we see on a substance is called lustre.
→ Atom: The smallest part of the matter is known as an atom.
→ Texture: It means how we feel upon touching the surface of a substance.
→ Rigid: It means whether a substance can be compressed or not.
→ Density: The mass per unit volume of a substance is known as density.