Dav Class 6 Science Chapter 3 Notes Nature of Mater -Here, we will share Dav Class 6 Science Chapter 3 Notes Nature of Mater . If you are searching for Dav Class 6 Science Chapter 3 Nature of Water Notes, then you are at the right place. queryexpress provides the best article on Dav Class 6 Science: The Living World Notes.
Dav Class 6 Science Chapter 3 Nature of Water Notes
| SL.NO | TOPIC |
| 1 | Our Environment |
| 2 | Food |
| 3 | Nature of matter |
| 4 | Separation of Substance |
| 5 | Changes around us |
| 6 | Measurement and Motion |
| 7 | The world of living |
| 8 | Structure and Function of the Living Organism-Plants |
| 9 | Structure and Function of the Living Organism-Animals |
| 10 | Work and Energy |
| 11 | Electric currents and Circuits |
| 12 | Light and Shadows |
| 13 | Magnents |
| 14 | Electric Currents and Circuits |
Dav Class 6 Science Chapter 3 Notes Nature of Mater
Nature of Mater
- The materials, which occur naturally, are called natural materials.
2. The materials, which are prepared by man, are called man-made or synthetic materials.
All the things that we see around us are made up of matter. Matter is something which has mass and occupies space. All matter can be broadly classified into three groups based on its physical state, namely, solid, liquid or gaseous state.
What is Matter?
- All the things that we see around us are made up of matter.
- Matter is something which has mass and occupies space.
- All matter can be broadly classified into three groups based on its physical state: solid, liquid, or gaseous.
Nature of Mater Dav Class 6 Chapter 3 Notes
Classification of Materials
- We see a variety of materials around us. They have different shapes, sizes, colours and other properties.
- To make the study of materials and their properties easier, we classify them into groups and then study the general properties of each group.
- A grouping of materials having similar properties is known as classification.
- The materials that occur naturally are called natural materials.
- The materials that are prepared by man are called man-made or synthetic materials.
Constitution of Matter
- All matter is made up of very small particles.
- Different states of matter have different arrangements of these particles.
- In solids, the particles are very tightly packed with each other and cannot move. Hence, solids have a fixed shape and a definite volume.
- In liquids, the particles are less tightly packed and can move a little. Liquids have a definite volume but do not have a fixed shape.
- In gases, the particles have very little hold on each other. They can, therefore, move far apart from each other. Hence, gases have neither a fixed shape nor a definite volume.
Dav Class 6 Science Chapter 3 Nature of Mater Notes
Properties of Matter
Appearance and Feel
- Materials are known to differ from one another in terms of their ‘appearance’ (lustrous/dull) and their ‘feel’ (smooth/rough).
- For example, metals generally have a lustrous appearance, and a polished piece of marble has a smooth ‘feel’.
Transparency
- The property of a material to allow light to pass through it is called transparency.
- One can see through a transparent material.
- Transparent materials: Glass, pure water, air, and a thin sheet of polythene.
- Materials that do not allow light to pass through them are called opaque materials.
- Opaque materials: Thick plastic sheet, blackboard, and a wall.
Floating/Sinking
- Materials which are lighter than water generally float over it.
- Materials which are heavier than water generally sink in it.
Diffusion
- The property of mixing of particles of two materials, on their own, is called diffusion.
- This happens due to the free movement of the particles of such materials.
- Gases diffuse very quickly into each other because their particles are in constant motion.
- Liquids diffuse into each other quite slowly because their particles are not so free to move as they are in gases.
- Solids do not diffuse with each other because their particles are held tightly and cannot move freely. Solids can, however, diffuse slowly into liquids.
Dissolution
- When one substance mixes completely with another substance, to give a clear solution, we say it has dissolved.
- The property, by which a substance dissolves in another substance, is called dissolution.
- Some solids dissolve in water and are called soluble substances. For example, salt and sugar are soluble.
- Some solids do not dissolve in water and are called insoluble substances. For example, sand is insoluble.
- Some liquids are soluble in water (e.g., lemon juice), and some are insoluble (e.g., mustard oil).
- Some gases dissolve in water (e.g., carbon dioxide, oxygen), while some do not (e.g., helium, ozone, hydrogen).
Dav Class 6 Science Chapter 3 Notes Nature of Mater
Solubility and Saturated Solution
- The maximum amount of a substance that can be dissolved in a given volume of water is called the solubility of that substance in water.
- A solution which cannot dissolve a greater amount of a given substance at a given temperature is called a saturated solution.
- The solubility of a substance generally increases with increasing temperature.
- The solubility of a gas in water decreases with an increase in its temperature.
Solubility and Saturated Solution -The maximum amount of a substance that can be dissolved in a given volume of water is called the solubility of that substance in water. Let us perform the following activity to understand the meaning of a saturated solution.
- Diffusion -mixing of particles of two materials on their own.
- Dissolution- complete mixing of one substance with another substance.
- Man-made/synthetic materials -the materials which are prepared by man.
- Matter is something which has mass and occupies space.
- Natural materials materials which occur naturally.
- Opaque materials materials which do not allow light to pass through them.
- Solubility maximum amount of a substance that can be dissolved in a given volume of a given liquid (usually water).
- saturated solution, in which more of the given substance cannot be dissolved at a given temperature. The transparency property, which allows light to pass through a material
Give Reason Questions and Answers Dav Class 6 Science Chapter 3 Notes Nature of Mater
- Question: Why do solids have a fixed shape and a definite volume? Answer: Solids have a fixed shape and a definite volume because their particles are very tightly packed and cannot move.
- Question: Why do gases not have a fixed shape or a definite volume? Answer: Gases do not have a fixed shape or a definite volume because their particles have very little hold on each other and can move far apart from each other.
- Question: Why do gases diffuse very quickly into each other? Answer: Gases diffuse very quickly into each other because their particles are in constant motion and are not held tightly together.
- Question: Why does sand not dissolve in water? Answer: Sand does not dissolve in water because it is an insoluble substance. The particles of sand do not mix completely with the particles of water.
- Question: Why does the solubility of a gas in water decrease when the temperature increases? Answer: The solubility of a gas in water decreases because, as the temperature increases, the particles of the gas move faster and can escape from the liquid more easily.
- · Question: Why can you see through a glass of pure water? Answer: You can see through a glass of pure water because it is a transparent material, meaning it allows light to pass through it.
- · Question: Why does a piece of wood float on water while a stone sinks? Answer: A piece of wood floats on water because it is lighter than water. A stone sinks because it is heavier than water.
- · Question: Why do liquids diffuse into each other more slowly than gases? Answer: Liquids diffuse into each other more slowly than gases because their particles are not as free to move as the particles in gases.
- · Question: Why does a wall not allow light to pass through it? Answer: A wall does not allow light to pass through it because it is an opaque material. Opaque materials block the passage of light.
- · Question: Why does a saturated solution of sugar and water dissolve more sugar when heated? Answer: A saturated solution of sugar and water can dissolve more sugar when heated because the solubility of a substance in water generally increases as the temperature increases.
Fill in the Blanks Dav Class 6 Science Chapter 3 Notes Nature of Mater ️
- Matter is something which has mass and occupies space.
- The materials that occur naturally are called natural materials.
- The property of a material to allow light to pass through it is called transparency.
- Materials which are lighter than water generally float over it.
- The property of mixing of particles of two materials, on their own, is called diffusion.
- The maximum amount of a substance that can be dissolved in a given volume of water is called the solubility of that substance.
- A solution which cannot dissolve more of a substance at a given temperature is called a saturated solution.
- Solids do not diffuse with each other because their particles are held tightly and cannot move freely.
- Opaque materials are those that do not allow light to pass through them.
- In gases, the particles have very little hold on each other and can move far apart.
Dav Class 6 Science Chapter 3 Notes Nature of Mater
- All matter can be broadly classified into three groups: solid, liquid, and gaseous states.
- A grouping of materials having similar properties is known as classification.
- The materials which are prepared by man are called man-made or synthetic materials.
- In liquids, the particles are less tightly packed and can move a little.
- A polished piece of marble has a smooth feel.
- The solubility of a substance generally increases with increasing temperature.
- The property by which a substance dissolves in another substance is called dissolution.
- Some solids do not dissolve in water and are called insoluble substances.
- We can see through a transparent material.
- Materials that are heavier than water generally sink in it.